Instantaneous velocity and Average acceleration are vectors. Hence, the correct options are (I) and (II).
The instantaneous velocity is a quantity that shows us how quickly an object is moving at any point along its path. The time between the two events approaches zero when the average velocity between two points on the path reaches a certain limit. Instantaneous velocity is a vector with a dimension of length per time, similar to average velocity.
The rate at which the velocity changes is known as the average acceleration vector. It moves in the direction of the velocity change, v. The rate at which a velocity is changing over time is called acceleration. Acceleration is also a vector quantity and must take into account changes in both the magnitude and direction of a velocity. Because velocity has both magnitude and direction, it is referred to as a vector quantity.
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Divya has 70 rocks. she donates half of the rocks to a science center. then she collects 3 rocks on each of her nature hikes. write an expression to represent the number of rocks divya has after she collects rocks on n nature hikes.
The expression to represent the number of rocks Divya has after she collects rocks on n nature hikes is 35 + 3n.
What is Science?Science is a methodical endeavor that creates and arranges knowledge in the form of universe-related explanations and predictions that can be put to the test.
Some of the earliest archeological evidence for scientific reasoning is tens of thousands of years old, and science may be as old as the human species. Ancient Egypt and Mesopotamia produced the oldest written documents in the history of science between 3000 and 1200 BCE.
Initially Divya has 70 rocks, after that she donated half of the rocks to science center means she has now 35 rocks left.
According to the question, she collects 3 rocks on each of her nature hikes, so the expression will be :
35 + 3n where,
n= number of hikes.
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Suppose that, while in a squatting position, you stand on your hands, and then you pull up on your feet with a great deal of force. You are applying a large force to the bottoms of your feet, but no matter how strong you are, you will never be able to lift yourself off the ground. Use your understanding of force and motion to explain why this is not possible.
Answer: The Earth's gravity is too strong.
Explanation: I don't have a full understanding, but probably the Earth is too strong. If you push yourself up, it'll feel difficult.
a person travels by car from one city to another with different constant speeds between pairs of cities. she drives for 40.0 min at 70.0 km/h, 16.0 min at 75.0 km/h, and 50.0 min at 40.0 km/h and spends 35.0 min eating lunch and buying gas.
The Average speed is 42.44 km/h ,the distance between cities is 99.02kmSpeed is the rate at which something or someone is moving.
The average speed of an object can be determined if you know the distance traveled and the time it took. Distance times speed is how speed is computed. In order to compute the units for speed, you must be aware of the units for both distance and time. Given that the distance in this example is measured in metres (m) and the duration is recorded in seconds, the units will be metres per second (m/s) For the purpose of calculating the other two, we require the other two (time, speed, or distance). To determine how long it will take to complete a journey, for example, information about the distance and speed of travel is needed.
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A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton’s laws of motion to explain the skydiver’s motion?
An upward force balances the downward force of gravity on the skydiver.
The skydiver’s inertia is zero, which no longer allows for acceleration.
An unbalanced force pulls the skydiver toward the ground.
The mass of the skydiver is so great that there is no acceleration.
Answer:
Newton's First Law
Explanation:
As you had already mentioned the explanation about the querry you have,
I accept the reasons you have mentioned.
Definitely an upward force will balances the downward force on the skydiver, And the unbalanced force pulls the skydiver towards ground was the Gravitational force. As there is no any other acceleration, the velocity of the skydiver towards the ground is 9.8.
The skydiver's motion can vary in different views like,
1. A person in the plane view is a parabolic path.
2. A person from the ground view is straight line path.
So, the skydiver's motion varies according to the observer view.
date: 09-10-2022
Answer: A
Explanation: yes
a jet plane is cruising at 300 m/sm/s when suddenly the pilot turns the engines up to full throttle. after traveling 4.1 kmkm , the jet is moving with a speed of 400 m/sm/s.
The direction of the net force acting on an object defines the direction of its acceleration. The acceleration of the plane is 8.75 m/s².
What is meant by acceleration ?Any procedure where the velocity varies exists directed to as acceleration. There are only two ways to accelerate: changing your speed or changing your direction, or changing both. This exists because velocity exists both a speed and a direction.
The initial speed of a plane is [tex]$v_{i s}[/tex] = 300 m/s
Distance covered by plane is s = 4 km = 4000m
The final speed of the plane is [tex]$$v_{f s}[/tex] = 400 m/s
The acceleration of the plane.
Using kinematical equation v²[tex]{ }_{f s}[/tex] = v²[tex]{ }_{\text {is }}[/tex] + 2as
Substitute known values in the above equation, we get
400² = 300² + 2 a(4000)
simplifying the above equation, we get
400² -300² = 8000 a
a = 70000/8000
= 8.75 m/s²
Therefore, the acceleration of the plane is 8.75 m/s².
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what is the relationship between wavelength of light and the quantity of energy per photon? question 4 options: they have a direct, linear relationship. they are logarithmically related. they are only related in certain parts of the spectrum. they are inversely related.
Last option is correct that is the relationship between wavelength of light and the quantity of energy per photon is inversely related.
Energy is inversely correlated with wavelength because it is directly proportional to the electromagnetic frequency of the photon. The energy of a photon increases with its frequency. In other words, the energy of a photon decreases with increasing wavelength. Wavelength and frequency are related to energy in the same way that they are to light. Greater energy is correlated with shorter wavelengths and higher frequencies. Therefore, lower energy is produced by longer wavelengths and lower frequencies. E = hv is the energy equation. When we increase the denominator, the fraction also increases, resulting in a decrease in energy. As a result, energy and wavelength have an inverse relationship.
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What force do you need to accelerate a car at 5m/s2 that has a mass of 3,000kg?
The force needed to accelerate a car at 5 m / s² that has a mass of 3,000 kg is 15 KN
F = m a
F = Force
m = Mass
a = Acceleration
m = 3000 kg
a = 5 m / s²
F = 3000 * 5
F = 15000 N
F = 15 KN
According to Newton's second law of motion, the force is equal to the rate of change of momentum of the object.
Therefore, the acceleration of the car is 15 KN
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How many ohms is the resistance of the electric heater connected to 220 V voltage
Answer:
44 ohms.
Explanation:
R for V (according to Ohm's law). This second formula is more frequently used in practice to calculate resistive heating, whereas the first formula has other, more general applications. As we might infer from the equation, the units of watts also correspond to amperes2 x ohms (A2 x Ω).
The resultant force acting on the van is 1500 N.
Calculate the magnitude of force X.
[assume X is the only horizontal force opposing the motion of the van]
If the resultant force acting on the van is 1500 Newtons, then the magnitude of Force X would be 1500 Newtons as X is the only horizontal force opposing the motion of the van.
What is Newton's second law?Newton's Second Law states that the resultant force acting on an object is proportional to the rate of change of momentum.
As given in the problem statement If the resultant force acting on the van is 1500 Newtons, then we have to find the magnitude of Force X,
The magnitude of the Force X = 1500 Newtons
Thus, the magnitude of the force X would be 1500 as it is the only force acting on the van.
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a dragster gets to a peed of 112m/s over a distance of 300m from rest. Determine the acceleration of the dragster.
A dragster gets to a speed of 112 m/s over a distance of 300 m from the rest, then the acceleration will be 20.9 m/s².
What is Acceleration?The rate of change in an object's velocity with respect to time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.
Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is a vector quantity as well. The definition of acceleration is the change in velocity vector over a time interval divided by the time interval.
According to the question, the given values are :
Final velocity, v = 112 m/s.
Initial velocity, u = 0 m/s
Distance, s = 300 m.
Use the equation of motion,
v² - u² = 2as
112 ² - 0 = 2 (a)(300)
a = 12544/600
a = 20.9 m/s².
Hence, the acceleration of the dragster will be 20.9 m/s².
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Rowan is at an all-you-can-eat breakfast. He has a pancake on his plate and is going to put another pancake on top of it. Which one of these other pancakes would make the bottom pancake the warmest? Explain how the energy and temperature of both the bottom pancake and your chosen top pancake will change after they’ve been touching for a while, and why.
Answer:
look at the explanation
Explanation:
If this is the case, the pancake at the highest temperature will make the backside pancake the warmest due to transfer of thermal energy.
The switch of thermal strength between the hotter pancake and the backside pancake occurs through conduction. Conduction is a mode of transfer of thermal energy that takes place when the two bodies are in shut contact with each other.
After they have been touching for a while, the temperature of the backside pancake increases while the temperature of the top pancake decreases in view that thermal power is being transferred from the pinnacle pancake to the backside pancake.
water reaches to the magma that changes into steam .the steam contains which type of energy
Answer:
Geothermal energy
Explanation:
1. Choose the time interval with constant positive acceleration. (no calculations
needed)
A. 1 to 4 seconds
B. 7 to 9 seconds
C. 1 to 10 seconds
D. 4 to 5 seconds
Time with program duration at a constant amount of acceleration: 1 to 4 seconds. In mechanics, acceleration is the price you pay for exchanging the speed of an object for time.
Acceleration is a vector quantity. The direction of acceleration of an object is given by the direction of the net force acting on it. Acceleration is the name we give to any method of adjusting speed. If you think of velocity as velocity and path, then there is the simplest way to acceleration: change alternate velocity or alternate path - or both.
Acceleration (a) is the exchange of the ratio (Δv) for the change in time (Δt) expressed by the equation a = Δv/Δt. There are three styles of ascent motion: uniform acceleration, non-uniform acceleration, and medium acceleration. . Uniform acceleration, non-uniform acceleration, and medium acceleration are three types of improved motion. Uniform time acceleration refers to the motion in which an object moves in a straight line, jumping with the speed at equal time intervals.
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When a catapult is shot at angle of 35° and travels a horizontal distance 0.75 m and is in the air for 0.45 seconds. If the initial velocity is the same as the first trial (at 35"), how far would the catapult shoot the object if it was shot at an angle of 45°?
Answer:
As we said, horizontal projectile motion equations are a special case of general formulas. We don't need to specify the angle of launch, as it's parallel to the ground (so the angle is equal to 0°). As a result, we have only one component of initial velocity - Vx = V, whereas Vy = 0.
horizontal projectile motion
We will take the starting point to be at the origin. Then, the equations of motion can be written as:
Distance
Horizontal distance can be expressed as x = V
Explanation:
This horizontal projectile motion calculator is a tool to solve a special case of projectile motion - the one where an object is launched horizontally from an elevated plane. Type in any two values, and the rest will be calculated in a blink of an eye! Furthermore, the trajectory will be displayed below the results. Keep scrolling to find out the horizontal projectile motion equations and a simple example of calculations - you shouldn't have problems with your exercises after reading our explanation!
a 617 g mass is connected to a light springof force constant 4 n/m and it is free to oscillate on a horizontal, frictionless track. themass is displaced 9 cm from the equilibriumpoint and released form rest.4 n/m617 g9 cmx
k=4 n/m, A=0.09 m, and m=0.617 kg.
1) T = m/n square root of 2 pi T = 2.466 sec
2) where w = 3.4606 rad/s and w = square root of k/m
Vmax = A*w = 0.311 m/s 3) a max = A*w*w
a max =7.389 m/s square
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a mIssile is moving 1810 m/s at a 20.0 angle. it needs to hit a target 19,500 m away iin a 32.0 direction in 9.20 s. what is the magnitude of the acceleration that the engine must produce
A missile is moving 1810 m/s at a 20.0 angle. it needs to hit a target 19,500 m away in a 32.0 direction in 9.20 s. The acceleration that the engine must deliver is 112 meters per second.
What is acceleration?The term "acceleration" refers to the rate of change in the object's velocity in relation to time, and it is measured in meters per second (m/s). In most contexts, meters per second squared is the unit of measurement for acceleration.
Let us start by thinking about the component that is horizontal in the x direction.
The length of travel in a plane horizontal to the starting point.
x = 19,500 cos 32.0° m
Using the second equation of motion to determine acceleration along the horizontal axis in order to:
[tex]x = ut + 1/2at^2[/tex]
[tex]19,500 * (cos 32.0^0 = 0 + (1810* cos 20.0^o) *9.20+ 0.5*a *9.20^2[/tex]
a = 21.01 m/s²
The same may be said for the vertical direction.
The distance traveled in the upward and downward directions combined.
Y is the velocity in the vertical direction, and it is equal to 19,500 in 32.0° m.
u= 1810 sin 20.0° m/s
t = 9.20 s
For the purpose of determining acceleration along the vertical axis by using the second equation of motion, For the purpose of determining acceleration along the vertical axis by using the second equation of motion
[tex]y = ut +1/2at^2[/tex]
19,500 sin 32.0° = 0 + (1810 sin 20.0^o)* 9.20 + 0.5*a* 9.20^2
a = 109.6 m/s^2
The resultant acceleration
[tex]a^2 = (21.01)^2 + (109.6)^2[/tex]
a = 112 m/s²
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(01. 05 MC)
Lessons Assessments Gradebook Email 36 Tools ▾
A witness states that a suspect contacted them on a specific phone app. Unfortunately, the app is no longer showing on the suspect's phone. How
would a forensic expert confirm the witness's testimony?
OUse Disk Drill to recover files
O Examine deleted browser history
The testimony cannot be confirmed
My Courses
OUse Cellebrite to pull deleted applications
Answer:
use disk drill to recover files
Explanation:
URGENT!! ILL GIVE
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What should be corrected in the model of nitrogen (N) shown below?
A spring gets 3.0cm longer when a 1.5N weight hangs from it. Calculate the extension with a 6.0N weight?
Answer:
The extension of an elastic object when a force is applied, such as a spring, is described by Hooke's law: force = spring constant × extension.
what is the acceleration (in m/s2) of gravity on the surface of the moon? m/s2 (b) what is the acceleration (in m/s2) of gravity on the surface (or outer limit) of venus? the mass of venus is 4.88 ✕ 1024 kg and its radius is 6.06 ✕ 106 m.
The acceleration due to gravity on the surface of the Moon is 1.635 m/s² and on the surface of Venus is 8.8634 m/s².
What is the acceleration due to gravity?There is acceleration, gravitational force, and acceleration due to gravity, all three are completely different from each other.
Acceleration due to gravity denoted by 'g' is the combined force of centrifugal force and gravitation force.Here g= 9.8 m/s² this force is caused by the force acting on the body due to the gravitational field.We know that the acceleration of gravity on the moon = 1/6 acceleration of gravity on the Earth
Therefore, the acceleration of gravity on the surface of the moon is given as
= 9.81 / 6
= 1.635 m/s²
b) For any planet (Venus) the acceleration of gravity is given as
g = GM/ R²
G = 6.67 × 10⁻¹¹
M = 4.88 × 10²⁴
R = 6.06 × 10⁶
g = ( 6.67 × 10⁻¹¹)(4.88 × 10²⁴) / (6.06 × 10⁶)²
g = 8.634 m/s²
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Brooke kicks a soccer ball with an initial horizontal velocity of 15 m/s off a 40-meter-high cliff and the soccer ball lands 60 meters away from the edge cliff. determine the final vertical velocity of the soccer ball.
The final vertical velocity of the soccer ball is 20 m/s.
We need to know about the projectile motion to solve this problem. The projectile motion is known as parabolic motion and the velocity is divided by 2 axes.
vox = vo cosA
voy = vo sinA
where vox is initial velocity of x axis, voy is initial vertical velocity, vo is initial velocity and A is the angle.
From the question above, the given parameters are
vox = 15 m/s
h = 40 m
x = 60 m.
The time taken of horizontal motion will be
x = vox . t
60 = 15 . t
t = 4 s
By using the uniform motion, where vty = 0 m/s and time taken to reach the peak is half of total time. Hence
vty = voy - gt
0 = voy - 10.(1/2 . 4)
voy = 20 m/s
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suppose you are standing in an elevator that is accelerating. what does the acceleration have to be so that your weight feels tripled? assume the positive direction is upwards.
In order the weight feels tripled, the elevator should be moving upward with acceleration 2g m/s² or two times of gravitational acceleration.
The free body diagram is shown on the attached picture.
The scale will read the normal force.
Suppose the elevator is moving upward. Using the Newton's second law of motion:
∑F = m.a
N - w = ma
N = mg + ma
Suppose the elevator is moving downward.
w - N = ma
N = w - ma
N = mg - ma
Where:
m = mass
a = acceleration
g = gravitational acceleration
From the above 2 cases, in order the scale to read the measured weight higher than its actual weight, N should be greater than w, or N = mg + ma, or the elevator should be moving upward.
The weight feels tripled means N = 3 mg.
Hence,
3 mg = mg + ma
a = 3g - g = 2g
Therefore, in order the weight feels tripled, the elevator should be moving upward with acceleration 2g m/s²
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What will happen to acceleration of mass spring system if its mass is doubled?
explain mathematically and briefly
Answer:
If the mass is doubled, then acceleration will be halved.
Explanation:
That situation is described by Newton's Second Law of Motion. F is force, m is mass and a is acceleration. The math behind this is quite simple. If you double the force, you double the acceleration, but if you double the mass, you cut the acceleration in half.
According to Newton's Second law of Motion, the acceleration of the mass spring system will be halved if the mass of the spring system is doubled.
What is Newton's Second law of Motion?Newton's second law of motion states that when an external net force is applied on an object, the acceleration of the object is proportional to the net force which is applied on the object, and it also occurs in the same direction as the direction of applied force. The acceleration of an object is inversely proportional to the net force applied and acceleration is inversely proportional to the mass of the object.
This situation can be best described by Newton's Second Law of Motion. The second law of motion can be expressed by the equation:
F = m × a
where, F is force,
m is mass, and
a is acceleration
Mass of an object is inversely proportional to the acceleration of the body. If the mass of the spring system is doubled then the acceleration of the object will be reduced to half.
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A rocket launcher makes an angle of 53.1 degrees from the ground. It launches a rocket with an initial speed of 20.8 m/s.
How high is it from the ground, in meters, after 1.43 seconds???
Height of the rocket launcher from the ground will be 33.7 m.
Initial speed of the rocket launcher = 20.8 m/s
Rocket launcher makes an angle of 53.1° from the ground.
Since the motion of the rocket is a projectile motion, as the rocket is projected from an angle of 53.1° from the ground, height of the rocket can be calculated using the formula [tex]h = \frac{v^{2}Sin^{2}\alpha }{2g}[/tex],
'h' is the height of the rocket
'v' is the final velocity of the rocket
'[tex]\alpha[/tex]' is the angle made by the rocket from the ground
' v' can be calculated by using the equations of the motion as v - u = gt
v = u + gt
v = 20.8 + (9.81) * (1.43)
v = 34.8 m/s
So,
[tex]h = \frac{v^{2}Sin^{2}\alpha }{2g}[/tex]
[tex]h = \frac{34.8^{2} Sin^{2}53 }{2*9.81}[/tex]
h = 33.7 m
The rocket will be 33.7m high from the ground after 1.43 seconds.
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an 8.19 kg mass moving east at 16.6 m/s on a frictionless horizontal surface collides with a 10.4 kg mass that is initially at rest. after the collision, the 8.19 kg mass moves south at 2.24 m/s. what is the magnitude of the velocity of the 10.4 kg mass after the collision?
The magnitude of the velocity of 10.4kg mass after the collision is 12.8m/s
Using the law of conservation of momentum
Sum of momentum before collision = sum of momentum after collision
m1u1 +m2u2 = m1v1+m2v2
m1 = 8.19kg
u1 = 16.6m/s
m2 = 10.4kg
u2 = 0m/s(at rest)
v1 = 2.24m/s
v2 = ?
Substitute
8.19(16.6)+10.4(0) = 8.19(2.24)+10.4v2
146.4=18.3+10v2
146.4-18.4 = 10v2
128 = 10v2
v2 = 128/10
v2 = 12.8m/s
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help me on ixl describe ecosystem
Answer:
it is defined as the study of living things and their environment
Guys if anyone knows how to answer, please help me with this question
Answer:
V = a t
t1 = 15 / 9.8 = 1.53 sec time to reach 0 speed
t2 = t1 = 1.53 sec time to reach point thrown
t3 = 5 - 2 * 1.53 = 1.94 sec time to fall height of cliff
H = V0 t - 1/2 g t^2 time to fall height of cliff (if V0 positive)
V0 = -15 m/s since it will return to thrown height with speed thrown up
Signs chosen must be consistent
H = -15 * 1.94 - 1/2 9.8 * 1.94^2 = -47.5 m where H is height of cliff
The
Car distance after 5 seconds
If a car travelling at 15 m/s applies the brakes at time 0 seconds and slows down at - 2 m/s2 find the distance the car travels after 5 seconds.
69
69
69
69 44444444444444444444444444444444
A person expended 600J of work to move a 95N move a full wheelbarrow. How far was the wheelbarrow moved?
Answer:
6.3 m
Explanation:
Work = force X distance
600 = 95 x d
d = 600/95 = 6.3 m
This is an A level/ Cape physics problem under the topic uncertainty, please do your best to answer, thank you.
The radius of the cylinder is 0.43 cm while the uncertainty is 0.04. This can likely be expressed as 0.43 +/- 0.04 cm
What is Absolute Uncertainty ?Absolute uncertainty or error is the difference between measured value of a quantity and the actual value.
Given an expression for the volume of a cylinder to be
V = πr²h
Where
V = 12 +/- 0.5 cm³h = 21 +/- 0.1 cmFrom the formula, make radius r the subject of the formula and calculate the radius
V = πr²h
r² = V/πh
r = √(V/πh)
r = √12/21π
r = √12/65.97
r = √0.18
r = 0.43 cm
The uncertainty Δr will be
Δr/r = (ΔV/V + Δh/h) × 2
Δr/0.43 = (0.5/12 + 0.1/21) × 2
Δr/0.43 = (0.0417 + 0.0048) × 2
Δr/0.43 = 0.093
Δr = 0.093 × 0.43
Δr = 0.0399
Δr = 0.04
Therefore, the radius of the cylinder is 0.43 +/- 0.04 cm
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