Question

An acorn falls from a tree. Compare its kinetic energy (KE) to its potential energy (PE) during the falling process.

A) KE increases and PE decreases

B) KE decreases and PE decre

C) KE increases and PE increases

D) both KE and PE remain constant

What type of force is needed to make any object move in a circular path?

A) a normal force

B) an abnormal force

C) a centripetal or radial force

D) military force

Answer #1

When acorn falls from a free, then kinetic energy increases and potential energy decreases. Potential energy decreases because height decreases, and kinetic energy increases because speed increases when height decreases in case of free fall.

Thus correct option is (A).

In a circular motion, a centripetal force needs to move aa object in a circular path. This centripetal force acts in radial direction,that is why it is called radial force.

Thus correct option is (C).

1/
An object moving at a certain speed has a kinetic energy KE of 90
J. If its speed is made 3 times smaller, what would the decrease in
its KE be? 2/ An object of mass 1 kg is pushed up along a 5 m long
incline to a vertical height of 1 m. The change in its potential
energy is;
3/ A 1-kg object is dropped from a height of 40 m and falls
freely to the ground....

An electron experiences a force moving in a magnetic field and
bends its path. Its kinetic energy Question 11 options: decreases.
becomes potential energy. increases. stays the same

An electron experiences a force moving in a magnetic field and
bends its path. Its kinetic energy
Question 11 options:
decreases.
becomes potential energy.
increases.
stays the same.

QUESTION 1
1. Friction is a force acting in a ___________ direction of
motion
to. perpendicular
b. opposite
c. to the weight of the object
d. None of the above
QUESTION 2
1. When the speed of a mobile phone doubles, what happens to its
kinetic energy?
to. Quadruples
b. Doubles
c. It does not change
d. It is cut in half
QUESTION 3
1. The main difference between the kinetic energy KE and the
gravitational potential energy PE is...

1. What is the momentum (p) of a 960-MeV proton (that is, its
kinetic energy is 960 MeVMeV )? Express your answer with the
appropriate units.
2. An electron (mmm = 9.11×10−31 kg ) is accelerated from rest
to speed v by a conservative force. In this process, its potential
energy decreases by 6.70×10−14 J . Determine the electron's speed,
v. (in term of c.)

**Please do not write in handwriting**
1- Compare the values of kinetic, potential and total energy of
an oscillating mass-spring system in the following cases:
a) When the spring is the most compressed and the most
extended.
b) When the spring is nearly relaxed.
2- Suppose that a simple pendulum is calibrated to 2 cycles per
second at sea level and is then brought up to the top of a tall
mountain. What would need to be done to re-calibrate...

7.A radio-controlled car increases its kinetic energy from 2 J
to 10 J over a distance of 5 m. What was the average net force on
the car during this interval?
_____N
8.A toy car has a kinetic energy of 4 J. What is its kinetic
energy after a frictional force of 0.5 N has acted on it for 6
m?
______J
9.How much work does a 68 kg person do against gravity in
walking up a trail that gains...

A baby bird falls from its nest in a tree. Luckily, Sasquatch
catches the baby bird before it hits the ground, bringing it to
rest. Which describes the work W done by Sasquatch on the baby bird
and its change in gravitational potential energy ∆Ugrav between the
nest and where it was caught?
A. W > 0, ∆Ugrav < 0
B. W > 0, ∆Ugrav > 0
C. W = 0, ∆Ugrav > 0
D. W < 0, ∆Ugrav <...

8 through 10 done please!!
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill is...

just do questions 5 through 10
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill...

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