**Physics
Lab First Semester Final – Part II**

*Read each question carefully, draw a diagram where
appropriate and show your work for partial credit. Remember to put your answers in
significant figures. Be careful to put your calculator in radians
or degrees depending on the problem.
Good Luck!*

1. In a basketball game a 70.0 kg player is running a fast
break and takes off for a dunk.

What is the player’s
weight?

How much work does the
player do if he applies a force of 1250 N over a distance of 0.500 m while
jumping?

If all of that work is
converted to kinetic energy, at what velocity does he leave the ground?

If he takes off at a 60
degree angle, how far does he jump
horizontally, assuming that he lands with his legs in the same position that he
took off in?

What is the maximum
height the player reaches?

2. A police officer is sitting by the side
of the road when a speeder passes him at 142 km/hr. What is this speed in m/s?

After two seconds he takes off after
him with a constant acceleration of 6.4 m/s.
How long will it take him to reach the same speed of the speeder?

How many meters behind the speeder
is the police officer at this point?

Draw a __sketch__ of a
velocity-time graph showing the velocity of the police officer and the speeder.

3. A coin (m = 0.00500kg) is placed 0.11 m from the axis of a rotating
turntable of variable speed. The coin
will remain on the turntable until a rate of 39 rpm (revolutions per minute) is
reached, at which point the coin slides off.

What is the angular velocity of the
turntable in radians per second at this speed?

If the turntable’s radius is a disk
of mass 0.80 kg and radius 0.28 m, what is it’s moment of inertia? What is its kinetic energy? Its angular momentum?

What is the centripetal force on the coin provided by the
friction?

What is the coefficient of friction?

4. A 1.25 kg block of wood is hung from a
thin cord. A bullet is then fired from
a gun at the hanging block.

The
gun exerts a force of 1.35 x 10^{4}
N on the bullet. If this force acts for
0.001 seconds, what will be the velocity of the 0.05 kg when it leaves the gun?

If
the bullet collides and sticks in the block, what will be the speed of the
bullet and block following the collision?

What is the KE of the block and bullet assuming __half__
the KE is conserved?

How high above its original point will the cord swing if
all the KE is turned into PE?

5. Look at the diagram below. A block of mass 3 kg hangs from a
pulley. Another block with a mass of 2
kg sits on the incline plane which has an angle of 37 degrees.

The
force of friction has a magnitude of 4.5 N.

Label the forces present in the problem on the diagram.

What is the net force on the system?

What is the acceleration of the system?

How far will the 3kg block have fallen in 1.3 seconds if
it starts from rest?

6. The sign drawn below is held by two
cables. The tension in cable one is 680
N. What is the tension in cable
two? The two angles are 40 and 60
degrees respectively.

What is the weight of the
sign in Newtons?

What is the mass of the
sign in kilograms?

If the sign is 9 m above
the ground and the cables are cut, how long would it take for the sign to fall
to the ground?

How fast would the sign
be going just before it hit the ground?