The net force of the lawn mower is 32.5 N and acceleration is 1.62 m/s^2.
The student pushes the lawn mower with 15.5 force and the lawn mower's motor provides 20.0 N force. The grass has a resistance force 3.0 N which is in opposite direction to the student's and lawn mower's forces. So, the net force is given,
F = 15.5 N + 20.0 N - 3.0 N = 32.5 N
According to Newton's second law, we know the relation between acceleration and force applied. Force is equal to mass times acceleration. The mass of the lawn mower is 25.0 kg.
[tex]a=\frac{F}{m}[/tex]
a = 32.5/20 = 1.62 m/s^2
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3. Find the resultant of the following two displacements 2m at 30⁰ and 4m
at 120⁰. The angles are taken relative to X - axis.
2m
K.
30⁰
4m
600
120°
The resultant of the two displacements 2m at 30⁰ and 4m
at 120⁰ is 93.4 degree.
Describe displacement.Displacement is the process of removing something from its usual location or position and substituting another object in that space.
Given: The sum of the displacements at 30 degrees and 120 degrees, respectively, is 2 meters.
Currently, there are two displacements, which
R1 = 2 cos 30 – 4 cos 60
= 2 x √3 / 2 – 4 x 1 / 2
= √3 - 2
= 1.732 - 2
= - 0.268 m
R2 = 2 sin 30 + 4 sin 60
= 2 x 1/2 + 4 x √3 / 2
= 1 + 2 √3
= 1 + 2 (1.732)
= 1 + 3.464
= 4.464 m
Now R = √R 1^2 + R2^2
= √(-0.268)^2 + (4.464)^2
= √0.0718 + 19.927
= √19.999
= 4.472 m
Now tan Q = R 2 / R1
= 4.464 / - 0.268
= - 16.656
Or Q = - 86.6 degree
Now the outcome will be 180 – 86.6 = 93.4 degree
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Using energy considerations, calculate the average force a 60. 0-kg sprinter exerts backward on the track to accelerate from 2. 00 to 8. 00 m/s in a distance of 25. 0 m, if he encounters a headwind that exerts an average force of 30. 0 n against him.
Answer:
−102 N
Explanation:
Hope this helps.
at which lettered point or points is the object speeding up? check all that apply. at which lettered point or points is the object speeding up?check all that apply. aa bb cc none submitrequest answer part b at which lettered point or points is the object slowing down? check all that apply.
The object is speeding up at point D and next the speed picks up at point C.
How to check the speed of the object?We have a time-position graph in front of us with a few points marked on it that we ought to investigate. The location where the curve's steepest slope is located is where the object is going the fastest.The point is D in this instance.Keep in mind that the graph changes to the right; therefore, if the right side is higher than the left side at any point, the item is traveling to the left (negative x-axis) at that precise moment. In this case, the points are C, D, and E.The item accelerates when the curve's curvature changes and the slope rises; for instance, from B onwards, the acceleration increases.Next, the speed picks up at point C. The inverse of what we just said is true: if the slope declines, the object slows down.In this instance, it is clear that the slope steepens after A and after E.When is the object reversing?It's simple to understand that the item moves to the right (positive x-axis) until it reaches point B, at which point it flips around.To learn more about the speed of an object, refer
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a railcar with an overall mass of 72,000 kg traveling with a speed vi is approaching a barrier equipped with a bumper consisting of a nonlinear spring whose force vs. compression law is given by fs
According to Hooke's law, the applied force F equals the displacement or change in length x multiplied by a constant k, or F = kx. The value of k is determined not only by the elastic material, but also by its dimensions and shape.
What is the force definition of compression?When a physical force presses inward on an object, compression force causes it to become compacted (or compressive force). During this process, the relative positions of the object's atoms and molecules change.
F = P/A is the compressive strength formula, where F is the compressive strength (MPa) P=The maximum load (or load until failure) of the material (N) A=A cross section of the load-bearing material's area (mm2).
When the force of compression exceeds an object's ability to withstand it, buckling occurs.
The relationship between force and a measurable property of the objects involved is expressed by a force law. Some interactions can be described by force laws, while others cannot.
There are forces that do not change significantly from one instant to the next and are referred to as constant in time and constant in space.
Hence, Hooke's law states that the applied force F equals the displacement or length change x multiplied by a constant k, or F = kx. The value of k is determined not only by the type of elastic material in question, but also by the temperature.
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Pls solve answer with explanation.. physics problem
Answer:
9Ms correct answer ???????????//?
Iridium is a substance found only in asteroids and other space objects. This graph shows the amount of Iridium found in different sediment layers of Earth. They are marked off into 17 sections representing time.
Iridium Levels graph shows Iridium levels in sediment layers. Beginning at sediment layer 1, iridium levels remain between 0 and 5, jumping to a level of 23 between layers 5 and 6, and decreasing to near starting levels at layers 14 through 17.
What most likely happened in sediment layer 5?
A massive volcano erupted, causing global warming and lava flow, which in turn caused mass extinction.
More iridium was produced by space objects and dumped by local factories.
The impact of a space object led to the deposit of a layer of sediment high in iridium.
Fewer impacts lead to a drop in iridium levels and a mass extinction caused by a lack of sunshine.
The most likely thing that happened in the sediment layer 5 is that A. The massive volcano erupted, causing global warming and lava flow, which in turn caused mass extinction.
What is the information about?The element iridium is only present in asteroids and other outer space objects. The amount of iridium present in various Earthly sediment layers is depicted an divided into 17 portions to illustrate the passage of time.
Iridium is a plentiful element in outer space, especially in asteroids. The Alvarez Hypothesis provides support for this response. The most potent nuclear bomb ever exploded only released a fraction of the energy that a large asteroid that struck the earth would have.
Global flames caused by this heat made the earth completely dark.
The creation of a dust cloud was the cause of this obscurity. The lack of sunshine also caused the vegetation to disappear, which in turn led to a global extinction.
In conclusion, the correct option is A.
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a 74-kg base runner begins his slide into second base when he is moving at a speed of 4.8 m/s. the coefficient of friction between his clothes and earth is 0.70. he slides so that his speed is zero just as he reaches the base.
The work energy of speed is
1304.2 .
What is work energy?
work energy is the most fundamental quantity of physics . Work is said to be done when a force applied to an object cause a displacement of a object.
Solution -
As per the given-
Mass of runner m = 74kg
Initial velocity of runner u=4.8 m/s
Final velocity of runner v =0
Coefficient of friction ¥=0.7
Let's d be the distance moved by runner till the stop.
a- mechanical energy lost due to friction
As friction does negetive work causing the runner to stop.
As we know,
Mechanical energy lost= Kinetic energy of runner
Mechanical energy lost =
1/2 mv^2 = 1/2 ×74×4.8^2=852.2
Distance move by runner-
Work done by friction = mechanical energy lost
-¥×mg×d =852.2 j
-0.7×74×9.8×d = -491.2
Solving the equation we get
1304.2.
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A particle executing SHM along a straight line has a velocity of 4cm/s, when at a distance of 3cm from its mean position and 3cm/s, When at a distance of 4cm from it. Find the time it takes to travel 2.5cm from its mean position.
The time it takes to travel 2.5cm from its mean position is 1.048 secs.
Describe the mean position.When there is no net force exerted on the body, it is in the mean position, sometimes referred to as the equilibrium position. An oscillating particle's phase: This shows how the particle is vibrating right now.
Given,
case(1), V1=4ms−1,y1=3m,
case(II), V2=3ms−1,y2=4m.
We know that, V=ω√( a^2−y^2 )
Case (I) 4=ω√(a^2−3^2)..(i)
Case(II) 3=ω√(a^2−4^2) …(ii)
Dividing (i) by (ii) , we get
16a^2−256=9a^2−81
After solving we get,
a=√25 =5m
Substituting it in (i), we get
ω= 4 / 4 = 1 rads^−1
When the particle is 2.5 meters from the extreme location, its distance from the mean position is given by the equation x = 5−2.5 = 2.5m.
Given that SHM must note the time from an extreme point, we will apply the relation:
x=acosωt.
2.5= 5cos 1 × t = 5 cos t
=> cost = 2.5/5 = 1/2 = cos ( [tex]\pi[/tex]/3 )
=> t = [tex]\pi[/tex] / 3 = 22 /7 x 3 = 1.048 secs
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A 1.20-kilogram frog is at rest on the bank surrounding a pond of water. As the frog leaps from the bank, the magnitude of the acceleration of the frog is 3.0 meters per second2 . Calculate the magnitude of the net force exerted on the frog as it leaps.
Force is the product of mass and acceleration, the magnitude of the net force exerted on the frog as it leaps is 3.6 N
What is Force ?Force can be simply defined as a pull or push. It is the product of mass and acceleration. And it is measured in Newton.
Given that a 1.20-kilogram frog is at rest on the bank surrounding a pond of water. As the frog leaps from the bank, the magnitude of the acceleration of the frog is 3.0 m/s² . The magnitude of the net force exerted on the frog as it leaps will be
F = ma
Where
m = 1.2 Kga = 3 m/s²Substitute the two parameters into the formula.
F = 1.2 × 3
F = 3.6 N
Therefore, the magnitude of the net force exerted on the frog as it leaps is 3.6 N
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3) A kid finds a super creepy doll and immediately chucks it off a cliff that is 72 meters high. The
super creepy doll flies 51 meters before it hits the ground. DRAW A PICTURE.
A) How long does it take for the super creepy doll to hit the ground?
B)At what horizontal velocity did the kid throw the doll
It takes 13.22 m/s as the horizontal velocity with which the kid throw the doll and the doll takes 3.77 seconds to hit the ground.
What is velocity and how it comes out to be 3.77 m/s ?As studied earlier the velocity is the change in the displacement per unit time of the object.Here it is given that the cliff is 70m high. And the doll flies 51 meters before it hits the ground.The flight edge 70m x 50m , using second equation of motion we can clearly see the displacement is equal to initial velocity.Accordingly putting in equation , {2x70/9.8}^1/2 and this will come out to be 3.77 seconds.For finding horizontal velocity using second equation of motion, from here we can say that the initial horizontal velocity is 13.22 m/s with which the kid threw the doll.To know more about velocity visit:
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What electric field e′ would have been required to create a current of 30. 0 amperes in a copper gauge 10 wire with diameter d equal to 0. 259 centimeters?.
The required electric field is 9.58 × 10⁻² N/C
We know that the electric field, E is a product of resistivity and current density
∴ E=jρ ......(i)
Where ρ⇒ Resistivity
j ⇒ Current density
j = I/A
Now, as per the question,
Resistivity of copper, ρ = 1.68 × 10⁻⁸ Ωm
Current, I = 30 ampere
Diameter = 0.259 cm = 0.00259 m
So, Radius, r = Diameter/2
= 1.295 × 10 ⁻⁴m
Now, Cross-sectional area, A = πr²
= 3.14 × (0.001295)²
= 5.26 × 10⁻⁶ m²
Putting the values in equation (i), we get:
[tex]E = 1.68 \times 10^{-8} \times\frac{30}{5.26 \times 10^{-6} }[/tex]
[tex]E= 9.58 \times 10^{-2} N/C[/tex]
Therefore, the required electric field is 9.58 × 10⁻² N/C
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What is the name of the seismic wave that is the first to occur during an earthquake? A. S wave B. Surface wave C. P wave
P waves are first to occur during an earthquake.
There are two types of earthquake waves based on the medium of travel.
1.Body waves- these waves travel through the solid part of earth crust.
2.Surface waves- these waves travel on earth's surface.
Body waves are divided into two types of waves i.e., P waves (primary) and S waves (secondary).
1.P waves (primary waves)- these are the fastest seismic waves which travel through the earth crust. P waves are the first waves to reach any location when an earthquake occurs.
2.S waves (Secondary waves)- these waves are second fastest waves after primary waves to reach a location when the earthquake occurs. S waves have half speed than that of P waves.
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if the object's initial velocity is 0 m/s, what is the acceleration of an object at t=8 s?
The rate of acceleration is =11.25ms−2
The initial velocity is u=0ms−1
The final velocity is v=90ms−1
The time is t=8s
The acceleration is
a=v−ut= 90ms−2
How do you determine an object's acceleration?The acceleration of an object is equal to the net force exerted on it divided by its mass, or a = F m, in accordance with Newton's second rule of motion. When an item's mass and the net force acting on it are known, the acceleration of that object can be calculated using this equation for acceleration.
The equation a = v/t denotes acceleration (a), which is the change in velocity (v) over the change in time (t). This enables you to calculate the change in velocity in metres per second squared.
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neglecting air resistance, after a rock thrown straight up reaches the top of its path and then falls a short distance, its acceleration is group of answer choices more than at the top of its path. the same as at the top of its path. less than at the top of its path.
if a rock is thrown straight up and falls, then its acceleration is the same as at the top of its path and it is equal to g, the gravitational acceleration.
If an object is moving straight vertically, the acceleration is constant along its trajectory, either it moves upward or downward. It is the velocity that changes.
If the object is moving upward, the velocity decreases, until at the top position, the velocity is equal to zero. The acceleration is constant and it is equal to g, the gravitational acceleration.
v(t) = vo - gt
Where:
v(t) is the velocity at time t
vo is the initial velocity
If the object is moving downward, the velocity increases. Again, the acceleration is constant and it is equal to g, the gravitational acceleration.
v(t) = vo + gt
This situation is depicted on the attaches picture.
Hence, if a rock is thrown straight up and falls, then its acceleration is the same as at the top of its path and it is equal to g, the gravitational acceleration.
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at what times t is the turtle a distance of 10.0 cm from its starting point? what is the velocity (magnitude and direction) of the turtle at each of those times?
The application of scientific knowledge to benefit people is….?
The application of scientific knowledge to benefit people is referred to as technology.
What is Technology?
This is referred to as the different ways in which scientific knowledge is applied so as to improve the living conditions and to ensure the practical aims of individuals are achieved.
Technology such as the invention of vehicles made it easier for the movement of goods and people from one place to another.It helped reduce stress and ensured that emergency situations were promptly attended to. It employed scientific knowledge such as motion, inertia etc in the design and production of it.
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URGENT!! ILL GIVE
BRAINLIEST! AND 100 POINTS
What element is shown below?
Who did experiments with light , known as the double-slit experiments, to produce interference patterns that could only be explained by evoking a wave-like nature for light?.
Thomas Young did the experiments with light , known as the double-slit experiments, to produce interference patterns that could only be explained by evoking a wave-like nature for light.
What is the double-slit experiment?
Thomas Young an English physicist, was the first to perform the double slit experiments. The experiment involved passing light through two tiny slits, thereby producing an interference pattern that could not be reconciled with the corpuscular view of light. Thus, the findings of Thomas Young supported the hypothesis that light consists of waves rather than particles.
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how much work is required to lift a 360 kilogram piano to a window whose height is 10 m from the ground
So, the work required to lift the piano is 36 kJ from the ground.
What connection exists between energy and work?An item needs to receive energy in order to move. Force is one way that energy may be transferred. Work or work done refers to the quantity of energy used by a force to move an item.
Transferring energy into an item to cause some displacement is what is referred to as work. The ability to perform tasks is referred to as energy. The work is consistently the same. Kinetic and potential energy are two examples of the various forms of energy.
The quantity of internal and mechanical energy that things contain fluctuates as a result of work. Energy is contributed to a system or an item when work is done on it. When a system or thing performs labour,
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if length of a wire is doubled keeping the diameter constant ,its young modulus of elasticity will?
i) increases
ii)decreases
iii)remains same
iv)depends on nature of matter
Answer:
Explanation:
Young's modulus is the property of the material and it does not depend upon the length or the area of the cross-section.
Hence, The most correct answer will be option (iii) but youngs modulus also depends upon the nature of the matter if you have to answer multiple option then (iii) and (iv) both are correct. If you have to answer only single option then go for option (iii).
An A. C is supply is
Connected accross a Capacitor
of 5 nf R=50_n in series at 50ttz find the;
Capacity rectance
Pedance
Supply Current
Vortage a cross the capacity
Answer:
d
Explanation:
a block with mass m1 is placed on an inclined plane with slope angle α and is connected to a second hanging block that has mass m2 by a cord passing over a small, frictionless pulley. the coefficient of static friction is μs and the coefficient of kinetic friction is μk
The mass m2 for which block m1 moves up the plane at constant speed once it is set in motion is:
m2 = m1 (sinα + μkcosα)
The tension in the cord should be [tex]m_{2}[/tex]g so the that the hanging block over a frictionless pulley can move at constant speed. This tension in the cord should the component of gravitational force and the force of friction.
Now
[tex]m_{2}[/tex]g = ([tex]m_{1}[/tex]g(sinα) +μk([tex]m_{1}[/tex]g)cosα)
[tex]m_{2}[/tex]g = [tex]m_{1}[/tex]g(sinα +μkcosα)
[tex]m_{2}[/tex] = [tex]m_{1}[/tex] (sinα + μkcosα)
So the mass [tex]m_{2}[/tex] for which m1 moves up the plane at constant speed once it is set in motion is:
m2 = m1 (sinα + μkcosα)
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On the periodic table, gold has the atomic number 79. This means that
A. an atom of gold has 79 protons and electrons combined.
B. gold can be found in 79 isotopes.
C. gold was the 79th element discovered.
D. an atom of gold has 79 protons.
Answer:
Option D is correct.
Explanation:
Atomic number of an element represent the number of protons present in its nucleus.
So, option D will be correct.
Answer: An atom of gold has 79 protons in its nucleus, or, in your case, C.
Explanation: The atomic number of an atom is the number of protons in the nucleus of an atom.
(I'm not entirely sure if this is clear enough, sorry!)
15. How far will a rolling ball be if it moves with an average velocity of 5m/s after 12s?
3. Alice and Kai were playing air hockey, which is a game where players hit a puck with paddles so the puck slides across
a table. After the game, they were crashing the puck and two different paddles. The puck was the same in both crashes,
but the paddles were different: the red paddle had less mass, while the purple paddle had more mass. Use the
information in the diagram to answer.
In which crash did the puck experience a stronger force? Why?
The crash in which the puck experience a stronger force is Crash 2 because the force on the purple paddle was stronger in this crash, so the force on the puck was also stronger. That is option B.
What is force?Force is defined as the pull or a push that is experienced by an object when it passes through a distance.
According to Newton's second law of motion that states that the force on an object is equal to its mass times its acceleration.
Therefore, force can also be defined as the product of mass and acceleration. That is, F = mass× acceleration.
This shows that force is directly proportional to mass. Therefore increase in the mass of an object will require more force to bring about its movement.
Therefore, the purple paddle has a greater mass with a stronger force leading to a stronger crash.
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Complete question's options:
The puck did not experience a force; only the paddles experienced a force in the crashes.
Crash 2; the force on the purple paddle was stronger in this crash, so the force on the puck was also stronger.
The diagram doesn’t tell you anything about the force on the puck. It only gives information about the force on the paddles.
The puck experienced the same force in both crashes. The paddles changed speed by the same amount in each crash, so the force on the puck was the same each time.
What does mass of an object depend on
Answer:
the inertia of an object
This is the 6th question. other 5 questions in a different one. will mark brainliest. need asap. thank you
The acceleration of an object is directly proportional to the force applied and inversely proportional to its mass.
If the same force is used to move all four masses, they will experience the same different accelerations since their masses differ.
According to Newton's second law, the greater the force used to throw the ball, the greater the ball's acceleration.
If forces, F, are equal, the acceleration of the wagons should be different.
If force, F, is the same for both cars, then you know the mass of Car A is less than the mass of Car B.
To move the wagons at the same speed you must use a much greater force, F on the bottom wagon because it has a greater overall mass.
What is the relationship between the force, mass, and acceleration of an object?According to Newton's second law of motion, the acceleration of an object is directly proportional to the applied force and inversely proportional to the mass of the object.
Therefore, the greater the mass of an object, the greater will be the force required to produce the acceleration as in an object of smaller mass.
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robots use cameras, microphones, and other sensors as inputs; outputs can be as complex as exploring damaged nuclear reactors to as simple as taking a photo.
Robots use cameras, microphones, and other sensors as inputs; outputs can be as complex as exploring damaged nuclear reactors to as simple as taking a photo.
What is a Robot?This is referred to as a machine which in most cases resembles a human being and it is involved in the execution of complex tasks in an automated manner such as lifting an object etc.It is usually controlled using a computer and employs the use of input devices such as cameras, microphones etc which ensures adequate and an easy execution of the tasks.
The output is also usually complex and the comparison is with that of a damaged nuclear reactors and this technological innovation has been useful in different facets of life due to the ease of performing activities it brings.
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The question is:
The functions of robots, cameras, microphones, and other sensors as inputs include:
An engineer wants to calculate how high a rocket starting from rest will be when it
reaches a velocity of 6,500.0 m/s with an acceleration of 389.00 m/s How the rocket be when it meets these conditions?
A moving object's speed and direction vary over time at a certain rate, which is known as acceleration. The term "acceleration" refers to the change in speed of a point or object along a straight line. Due to the constant change in direction, motion on a circle accelerates even while the speed is constant.
Velocity is measured by a specific unit of time and from a specific point of view, and it describes the rate at which an object's orientation changes while it is moving.
The term "Distance Traveled" describes how far an object has travelled during a specified amount of time to get to its destination. Or The path that a body takes to travel a specific distance at a certain speed from one location to another is known as the distance travelled.
Using,
Avg. acceleration (a) = (final velocity - initial velocity(v_i)) / time (t)
time = 6500 / 389 = 16.71 sec
Now, the following equation can be used to determine distance from acceleration: D = v*t + 1/2*a*t². where an is the acceleration, t is the passage of time, and v is the velocity.
D = distance travelled = 54309 m
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PLS HELP, I DIDN'T KNOW THIS WAS DUE UNTIL I CHECKED-AND IM WORKING ON MY OTHER 5 HOMEWORK ASSIGNMENTS, SO I DONT HAVE TIME TO DO THIS!!! I just need the answers you don't need to go into full detail! I'LL GIVE BRAINLIEST!!!
Proton has positive charge whereas neutron has no charge.
What are the difference between a proton and neutron?Proton is a type of subatomic particle that has a positive charge whereas Neutron is a type of subatomic particle that has no charge.
An atom that has lost one or more number of electrons is known as anion.
Isotopes is defined as an element that have the same number of protons i.e. atomic number but different numbers of neutrons i.e. mass number.
Electron is located outside the nucleus of an atom.
Fluorine is that atom which has 9 number of protons so its atomic number is 9.
Atomic number is related to the number of particles in the nucleus of an atom because in the nucleus, proton is present which shows the atomic number of an atom.
There are three parts of an atom i.e. proton, electron and neutron.
The size of electron is about 2 × 10⁻¹⁰ cm, The size of proton is about 0.84×10⁻¹³ cm and the size of neutron is about 1.7×10⁻¹⁵ meters
Electron has negative charge, proton has positive charge and neutron has no charge.
Yes, we can tell about the element if we know about the charge and the number of electrons in it because different atoms has particular number of electrons.
The diameter of a nucleus in scientific notation is 1.6 x 10⁻¹⁵.
The mass of hydrogen atom in whole number is 0.00000000000000000000000000167.
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