Practice Problem • In 2.5 s a car increases its speed from 60 km/h to 65 km/h while a bicycle goes from rest to 5 km/h.
•Which undergoes the greater acceleration?
• What is the acceleration of each vehicle?
Answer:
they have same acceleration 2m/s^2
Explanation:
a =v-u/t
65-60/2.5
2m/s^2
a) The acceleration of the car and the bicycle are equal since [tex]\delta V[/tex] for both vehicle is 5km/h and the time taken for both vehicle is also the same 2.5s.
b) The acceleration of the bicycle is 0.556m/s²
Given the data in the question;
Time taken for both car and bicycle; [tex]t = 2.5s[/tex]Initial velocity of car; [tex]u_c = 60km/h = 16.667m/s[/tex]Final velocity of car; [tex]v_c = 65km/h = 18.0556m/s[/tex]Since the bicycle starts from rest
Initial velocity of the bicycle; [tex]u_b = 0[/tex]Final velocity of the bicycle; [tex]v_b = 5km/h = 1.38889m/s[/tex]a)
The acceleration of the car and the bicycle are equal since [tex]\delta V[/tex] for both vehicle is 5km/h time taken for both vehicle is also the same 2.5s.
b)
The acceleration of each vehicle
To determine the acceleration for car and the bicycle, we use the first equation of motion:
[tex]v = u + at[/tex]
Where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time.
Now, For the car;
[tex]18.0556m/s = 16.667m/s + ( a + 2.5s )\\\\a = \frac{18.0556m/s - 16.667m/s }{2.5} \\\\a = \frac{1.3886m/s}{2.5s} \\\\a = 0.556 m/s^2[/tex]
Hence, the acceleration of the car is 0.556m/s²
For the bicycle;
[tex]1.38889m/s = 0 + ( a * 2.5s )\\\\a = \frac{1.38889m/s}{2.5s}\\\\a = 0.556m/s[/tex]
Hence, the acceleration of the bicycle is 0.556m/s²
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What is the "price" that you pay for using less force?
What is the “price” that you pay for using less force? The price that you pay for using less force is having to do more work.
.....................................
dont ask this is what i looked up and found
The "price" that you pay for using less force is:
The object would not moveForce is defined as the energy which is required to move or change the velocity of an object.
There are different types of force which includes:
Gravitational forceApplied forceFrictional force, etcAs a result of this, if there is less force exerted on an object, then the "price" which would be paid for this is that the object would not move.
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in physics, the use of force to move an object is called
Answer:
In physics, work means the use of force to move an object. ... Not all force that is used to move an object does work. For work to be done, the force must be applied in the same direction that the object moves
The use of force to move an object is called Work.
A force can change the motion of an object. A force causes an object with mass to change its velocity (acceleration).
[tex]\bold{Force = Mass\times acceleration}[/tex]
while work is the result of the action when a force causes an object to move in the direction of the force.
[tex]\bold{Work= Force\times Displacement}[/tex]
Therefore, the use of force to move an object is called Work.
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If a police car is travelling towards you what effect does this have on the police
siren?
Answer:
well they make the siren go beacaus eyou are doing somthing wrong so what were you thinking
Explanation:
What element has conductivity,shiney luster,magnitic
-science
Answer:
The answer to this question is given below in this explanation section.
Explanation:
"What element has conductivity,shiney luster,magnetic
-science"
silicon has a shiny luster,But it is brittle and conducts electricity poorly.Some metalloids change their characteristics when they react with different elements.Luster conductivity and malleability are physical properties can be observed be observed without attempting to change the identity of the substance.The term physical property is an observable characteristics of a substance. in this case the luster conductivity and malleability of metals are the properties, which can be observed by our senses.It differs from chemical properties which can only be observed when the substance change its chemical identity.
Metal are solid at room temperature with the exception of mercury which is liquid at room temperature.Luster metal have the quality of reflection light from its surface and can be polished e.g gold,silver and copper.
A boy is pulling a 150 kg crate with a force of 1150 N. If the crate experiences a frictional force of 490 N, find:
a) The acceleration of the crate.
b) The normal force acting on the crate.
First, let's find the resultant, and applicate 2nd law of Newton using the resultant, so:
R = ma
F - Ff = ma
Data:
F = Force = 1150 N
Ff = Friction force = 490 N
m = Mass = 150 kg
a = Aceleraction = ?
Replacing according our data:
1150 N - 490 N = 150 kg * a
660 N = 150 kg * a
660 N / 150 kg = a
a = 4,4 m/s² ← Aceleration of the object
For the normal force:The normal force IS NOT the resultant force, the normal force's the force between the ground and the object, in another words, is the weight of the object, and for the weight:
w = mg
w = 150 kg * 10 m/s²
w = 1500 N ← Normal force between object and ground.
Help me on question 3 pls I’m giving out brainlest
Answer:
Its 150?
Explanation:
5³= 5×5×5
I hope its help :)
What are the advantages of two-dimensional art forms like photographs?
What are the limitations of two-dimensional art forms like photographs?
Answer:Two dimensional forms can create the illusion of 3 dimensional shapes and spaces.
Explanation:
Suppose that two objects attract each other with a gravitational force of 16 units. If the mass of both objects was tripled, and if the distance between the objects was doubled, then what would be the new force of attraction between the two objects?
Answer:
The new force of attraction would be 36 units
Explanation:
Law of Universal Gravitation
Objects attract each other with a force that is proportional to their masses and inversely proportional to the square of the distance.
This statement can be expressed with the formula:
[tex]\displaystyle F=G{\frac {m_{1}m_{2}}{r^{2}}}[/tex]
Where:
m1 = mass of object 1
m2 = mass of object 2
r = distance between the objects' center of masses
G = gravitational constant: [tex]6.67\cdot 10^{-11}~Nw*m^2/Kg^2[/tex]
Now suppose two given objects attract with a force of F=16 units, thus:
[tex]\displaystyle G{\frac {m_{1}m_{2}}{r^{2}}}=16[/tex]
And now the masses of both objects is tripled, i.e., m1'=3m1, m2'=3m2, and the distance between them is doubled, r'=2r. The new force is:
[tex]\displaystyle F'=G{\frac {3m_{1}3m_{2}}{(2r)^{2}}}[/tex]
Operating:
[tex]\displaystyle F'=G{\frac {9m_{1}m_{2}}{4r^{2}}}[/tex]
[tex]\displaystyle F'=\frac{9}{4}G{\frac {m_{1}m_{2}}{r^{2}}}[/tex]
Substituting the value of the initial force:
[tex]\displaystyle F'=\frac{9}{4}\cdot 16[/tex]
[tex]F'=36\ units[/tex]
The new force of attraction would be 36 units
An object of mass 2kg raised to a height 10m possess potential energy of 200J. What is the kinetic energy and potential energy at a height 4 metre?
Explanation:
[tex]{\bold{\sf{\underline{Understanding \: the \: concept}}}}[/tex]
✠ This question says that there is an object and its mass is 2 kg ; it's raised to a height 10 m and possess potential energy of 200 J. Now this question ask us to find the kinetic energy and the potential energy at a height 4 metre.
[tex]\bold{↬{ }}[/tex][tex]{\bold{\sf{\underline{Given \: that}}}}[/tex]
✰ Mass = 2 kilograms
✰ Raised height = 10 metres
✰ Posses potential energy = 200 Joules
[tex]\bold{↬{ }}[/tex][tex]{\bold{\sf{\underline{To \: find}}}}[/tex]
✰ Kinetic energy at a height 4 metre
✰ Potential energy at a height 4 metre
[tex]{\bold{\sf{\underline{Solution}}}}[/tex]
✰ Kinetic energy at a height 4 metre = 120 J
✰ Potential energy at a height 4 metre = 80 J
[tex]{\bold{\sf{\underline{Using \: concepts}}}}[/tex]
✰ Potential energy formula.
[tex]{\bold{\sf{\underline{Using \: formula}}}}[/tex]
✰ Potential energy = mgh
[tex]{\bold{\sf{\underline{We \: also \: write \: these \: as}}}}[/tex]
✰ Potential energy as P.E
✰ Mass as m
✰ Joules as J
✰ Height as h
✰ Raised height as g
[tex]{\bold{\sf{\underline{Full \: solution}}}}[/tex]
✠ Let us find the Potential energy.↦ Potential energy = mgh
↦ Potential energy = 2 × 10 × 4
↦ Potential energy = 20 × 4
↦ Potential energy = 80 J
✠ Now according to the question let us find the kinetic energy↦ Kinetic energy = Posses potential energy - Finded potential energy
↦ Kinetic energy = 200 J - 80 J
↦ Kinetic energy = 120 Joules
An object of mass 2kg raised to a height 10m possess potential energy of 200J.
to find:-What is the kinetic energy and potential energy at a height 4 metre?
solution:-from energy conservation,
potential energy at 10m height =potential energy +kinetic energy at 4 m
potential energy at 10 m height=200
let,Kinetic energy at 4m=KE
potential energy at 4m=PE
so,
200=KE+PEpotential energy at 4m height =
mgh2×10×480Hence,
kinetic energy at 4m is =200-80=120J
Help me please with science
Answer:its b
Explanation:
a stone is thrown vertically upwards with an initial velocity of 20 metre per second find the maximum height it reaches and the time taken by to reach the height( g =10m/s)
Answer:
y = 20 [m]
Explanation:
To solve this type of problem we must use the following equation of kinematics.
[tex]v_{f}^{2} =v_{o}^{2}-2*g*y[/tex]
where:
Vf = final velocity = 0
Vo = initial velocity = 20 [m/s]
g = gravity acceleration = 10 [m/s²]
y = elevation [m]
Now the key to solving this problem is to know that when the stone reaches the maximum height its speed is zero. Therefore the final velocity term is zero.
[tex]0 = (20)^{2}-2*10*y\\20*y=400\\y=20 [m][/tex]
Another important fact is that the sign of gravitational acceleration was taken as negative, since it acts in the opposite direction to the movement of the stone.
in 1965, two scientists made a surprising discovery. they detected a faint microwave radiation signal coming from all over the universe
what is this microwave radiation?i’ll give brainlist
Answer: someone took down my answer I don’t know why when I took this test and got it right but the answer is C like the other person said.
Explanation:
The microwave radiation referred to in this context is radiation that was released as matter formed in the early universe. Therefore option A is correct.
Microwave radiation, also known as cosmic microwave background radiation (CMB), is a faint radiation that permeates throughout the universe.
It is considered to be the remnants of the thermal radiation released shortly after the Big Bang, during a phase called recombination. At this time, the universe transitioned from a hot, dense plasma to a state where neutral atoms could form, allowing photons to travel freely.
The cosmic microwave background radiation is isotropic, meaning it is uniformly distributed in all directions, and it has a characteristic temperature of approximately 2.7 Kelvin (-270.45 degrees Celsius).
It was first detected in 1965 by Arno Penzias and Robert Wilson, who were awarded the Nobel Prize in Physics for their discovery.
The presence of cosmic microwave background radiation provides strong evidence for the Big Bang theory and helps to support the understanding of the early universe's formation and evolution.
It serves as an important tool for studying cosmology and provides insights into the structure, age, and composition of the universe.
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a 50 kg box is pushed to the left using 500 N, the frictional force on the box is 100 N what is the acceleration on the box?
First thing's first, we need to find the Net Force of the system in order to solve for acceleration. Gravity and Normal Force cancel out, so we don't really have to worry about anything on the y-axis. However, looking at the x-axis, we see two forces: the Force of the push and Frictional Force.
This means that:
[tex]F_{net}[/tex] = 500 - 100
[tex]F_{net}[/tex] = 400 (N)
Recall that Force = Mass * Acceleration. Since we have the Force and Mass, we can easily solve for Accel:
F = ma
a = [tex]\frac{F}{m}[/tex]
Plug the net force and mass into the equation:
a = [tex]\frac{F}{m}[/tex]
a = [tex]\frac{400}{50}[/tex]
a = 8 (m/[tex]s^{2}[/tex])
The box's acceleration is 8 m/[tex]s^{2}[/tex]
If you have any questions about how I got to the answer, just ask :)
Which of these force&mass pairs will result in the largest acceleration? *
50 N and 5 kg
60 N and 3 kg
30 N and 1 kg
25 N and 100 kg
10 N and 8 kg
Answer:
30N and 1 kg has largest acceleration
hope it helps youWhat units would you use to measure a red blood cell ? (nanometers micrometers millimeters
Unit to measure red blood cell is million per cubic millimeter
What is red blood cell ?A red blood cell, also called a hematopoietic cell, hemocyte, is a cell produced through hematopoiesis and found mainly in the blood
Unit to measure red blood cell is million per cubic millimeter
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Increased levels of __________ __________ reaching Earth can lead to medical problems such as sunburn and skin cancer. What two words complete the sentence?
Answer:
Explanation:
The answer should be electromagnetic radiation(can i have a a brainliest) please
The increased levels of ultraviolet -radiation reaching earth can lead to health risks such as sunburn and skin cancer.
What is ultraviolet -radiation?Ultraviolet radiation is a high energy wave in the electromagnetic spectrum. The mains source of ultraviolet or UV rays is sun.
The electromagnetic spectrum is the arrangement of radiation based on the increasing order of energy or decreasing order of frequency. UV rays comes in between infra red radiation and visible light.
There are two type of ultraviolet rays namely UV-A and UV-B. In which UV-A has higher penetrating power and causes serious health risks than UV-B.
Reaching UV rays in an increased level to the earth surface will affect human beings as well as other organisms. It causes skin cancer, nausea, burning and other diseases.
Therefore the two words which suits to fill the statement is UV radiation.
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If an object moving at 5 m/s accelerates for 30 seconds at a rate of 2
m/s^2, what is its final velocity? *
Answer:
V=u + at
V= final velocity
U= Initial velocity
a= acceleration
t= time taken
V= 5 + 30*2
V=5+60
V=65m/s
Explanation:
Hailey was riding her bike at a velocity of 4 m/s to the north. Her velocity
changed to 6 m/s to the north. What was her change in velocity?
A. -2 m/s north
B. 6 m/s north
C. 4 m/s north
D. 2 m/s north
Answer:
D. 2 m/s north
Explanation:
Hailey was riding her bike at 4 m/s and was changed to 6 m/s so there was 2 more m/s added.
global climate is determined
Answer:
Global climate is determined depending on the amount of energy given from the sun to the certain area.
Example:
When it is Summer, (June, July) the Northern Hemisphere receives the most light and heat because it is tilted toward the sun.
4. A chandelier brightens a ballroom after a waiter moves a switch
Answer:
because switch moves after a waiter
Explanation:
In your own words explain how energy is involved in physical changes and in chemical changes
Answer:
All adjustments in issue include changes in energy. Energy is either delivered or consumed. The energy is often in the form of heat, however it might be in the form of sound or light.
Explanation:
this is in my own words btw:)
Q1.
The figure below shows a slide in a children's playground
Metal ladder
Metal support
(a)
A child of mass 18 kilograms goes down the slide
The vertical distance from the top to the bottom of the slide is 2.5 metres.
Calculate the decrease in gravitational potential energy of the child sliding from the
top to the bottom of the slide.
Gravitational field strength = 10 N/kg
Decrease in gravitational potential energy
(2)
Answer:
P = 450 J
Explanation:
Given that,
Mass of a child, m = 18 kg
The vertical distance from the top to the bottom of the slide is 2.5 metres.
The Gravitational field strength = 10 N/kg
We need to find the decrease in gravitational potential energy of the child sliding from the top to the bottom of the slide.
The formula for the gravitational potential energy is given by :
P = mgh
Substituting all the values,
P = 18 kg × 10 m/s² × 2.5 m
P = 450 J
Hence, the decrease in gravitational potential energy is 450 J.
On the pH scale, where can you find strong acids and strong bases?
Explanation:
The pH scale is an index ranging from 0-14 which measures the acidity or basicity of substances. The closer the pH of an acid to 0 the stronger it is and the closer the pH of a base to 14,the stronger it is.
Which natural resource is renewable?
Coal
Wind
Topsoil
Oil
Answer:wind
Explanation:
The natural resource that is renewable is wind. Explanation on wind as a renewable resource can be found below.
What is renewable resource?Renewable resources are those resources that is replenished or replaced by natural processes at a rate comparable to its rate of consumption by humans or other users.
Renewable resources cannot be exhausted as a result of use, unlike, their non-renewable counterparts.
Examples of renewable natural resources are as follows:
SunWindWaterTherefore, the natural resource that is renewable is wind.
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A subduction zone is where one plate is pulled under the edge of another and occurs in convergent plate boundaries. Which type of crusts are involved in the subduction zone?
a. continental-continental
b. continental-oceanic
c. oceanic-oceanic
Answer:
b. Continental-oceanic
Explanation:
The Earth's crust has been divided into a series of plates. These plates move at a different rate or speed in different directions.
These plates are divided by the boundary between them which are of three types: convergent, transform and divergent.
The convergent boundaries are the one which moves toward each other and the based on the crust they are of three types: continent-continent, ocean-ocean and ocean-continent.
In ocean-continent boundaries, the oceanic plate is denser compared to the continental plate is lighter as a result of which during the process of subduction the oceanic plate sinks beneath the continental plate towards the mantle and melts.
Thus, Option-B is the correct answer.
Ammonite fossils are not found in the top two layers. What does this mean?
Answer:
Im not sure, are there options for it?
Explanation:
A box is pushed 40 meters by a mover. The amount of work done was 2,240 joules. How much force was exerted on the box?
Write the formula used in the correct form and your answer with the appropriate unit.
Answer:
56N
Explanation:
Given parameters:
Distance = 40m
Work done = 2240J
Unknown:
Force exerted = ?
Solution:
The work done on a body is the force applied to move a body through a certain distance.
Work done = Force x distance
Now insert the parameters and solve for the force
2240 = Force x 40
Force = 56N
During the formation of the aurora borealis, the electrons in an atom experience a change in energy levels. Which statement about this change is accurate?
First, the electron releases energy to move to a higher energy level.
First, the electron absorbs energy to move to a higher energy level.
First, the electron absorbs energy to move to a lower energy level.
First, the electron releases energy to move to a lower energy level.
Answer:
They are deflected as Earth’s magnetic field exerts force on them.
Explanation:
(Not for cheating, Just to help)
As solar wind approaches Earth, what happens to the charged electrons?
They are absorbed as Earth’s magnetic field exerts force on them.
They grow stronger as Earth’s magnetic field exerts force on them.
They grow weaker as Earth’s magnetic field exerts force on them.
They are deflected as Earth’s magnetic field exerts force on them.
First, the electron absorbs energy to move to a higher energy level.
A golfer hits a golf ball upwards at an angle. We can ignore air resistance on the ball.
Which diagram best describes the velocity vectors and trajectory of the golf ball's motion?
Answer:
Check the diagram from the photo
Explanation: