Question

1. You are being hunted by a raptor. It corners you, and begins to charge, qt a velocity of 20 m/s. You have constructed a trap. It consists of a trip wire that will knock the raptor down and transfer all of its KE to a phaser rifle that requires 80 kJ of energy to fire directly at your foe. If the raptor has a mass of 150 kg, will the rifle gain enough energy to fire?

a)no

b)not enough data to tell

2. Which of these statemnts best describes the rotational form of Newtons 2nd law?

a.) the net torque acting on a rigid object is proportional to its angular acceleration

b.) the net torque acting on a rigid object is inversely proportional to its angular acceleration

d.) all of the above

3. One of these is an example of a longitudianl wave.

a.) sound waves

b.) electromagnetic waves

c.) microwaves

4.)To have standing waves you need to have two waves:

(i) that have same wavelengths (ii)that have the same amplitude (iii) traveling in opposite directions

a.)(i)

b.)(ii)

c.)all of the above

5.) Are below statements true or false

The frequency of a spring depends on the initial displacement away from equilibrium.

Mass is the amount of matter which is nothing more than an indicator of the number of atoms in a given object.

On the Moon, a feather and a hammer hit the lunar surface at the same time indicating that potential energy was conserved.

In the rotational motion experiment the moment of inertia had an effect on the angular acceleration.

6.) Match the following numbers with its best-fit letters below:

1. elastic collision

2. inelastic collision

3. Newton's first law

4. Newton's second law

5. Newton's third law

6. Moment of Inertia

7. Torque

a. also described as the action/reaction law

b. is marked by a peak in sound intensity

c. in this type of collision objects shapes are deformed and or they stick together

d. the net force=mass x acceleration

e. is analogous to force in translational motion, can cause acceleration on a rigid body

f. is related to shape and distribution of mass

g. an object will remain at rest or in motion in a straight line at a constant speed unless acted upon by a non-zero net force

h. in this type of collision you have only momentum conserved.

i. in this type of collision you have both mechanical energy and momentum conserved.

7.) Written question. Show your work. A student measures the length of a metal cylinder to be L=2.32+/-0.02 cm and the diameter to be 1.72+/-0.10 cm. Use the propagation of error equation to determine the uncertainty in the volume.

Thank you in advance

Answer #1

1) KE = 0.5*m*V^2 = 0.5*150*20^2 = 30 kJ

a) no

2) a.) the net torque acting on a rigid object is proportional to
its angular acceleration

3) a.) sound waves

4) c.)all of the above

5) False

TRUE

6) 1. elastic collision i. in this type of collision you have both mechanical energy and momentum conserved.

2. inelastic collision ............h. in this type of collision you have only momentum conserved.

3. Newton's first law.............g. an object will remain at rest
or in motion in a straight line at a constant speed unless acted
upon by a non-zero net force

4. Newton's second law,,,,,,,,,,,,,,,d. the net force=mass x
acceleration

5. Newton's third law..................a. also described as the action/reaction law

6. Moment of Inertia..............f. is related to shape and distribution of mass

7. Torque.....................e. is analogous to force in translational motion, can cause acceleration on a rigid body

7) dV = (2*0.1) + 0.02= +/- 0.22

Match the following words with the sentences blank space:
1st
2nd
3rd
inertia
net force
momentum
free fall
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b. A uniform net torque always changes the direction of the angular
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c. A uniform net torque always change the magnitude of the
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d. A uniform net torque will always cause a change of angular
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2. A net (non-zero) force acts on a particle. Which of the
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A spherical ball with mass 0.2 kg and
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a) Find the angular
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e) Find the external force and the
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Question 1: Mark True or False beside each
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_______(b) The torque due to a force is independent of
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_______(c) If the forces on an object balance, then this object
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_______(d) If the torques on an object balance, then this object
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_______(e) If...

1.The momentum of an object is not dependent on which one of
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a) acceleration b) inertia
c) mass
d) velocity
2.Which one of the following statements concerning the
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a) The momentum of the system is increasing.
b) The momentum of the system is decreasing.
c) The momentum of the system is equal to zero kg m/s. d)
The...

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(a) Briefly explain why momentum is conserved during the
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(b) Briefly explain why mechanical energy (kinetic plus
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