1.   Using scientific notation and the correct number of significant figures, what is the result of calculation 

A.  5 x 10-2

B.  4.8 x 10-2

C.  4.8 x 10-3

D.  4.81 x 10-2

E.  4.808 x 10-2

D.  250 N

E.  350 N

4.   Drake and Max are playing catch while standing on a hill. Drake sees his Dad walking towards the hill and   tosses the baseball to him horizontally with a velocity of 20.0 m/s. The horizontal distance from Drake to his Dad is 40.0 m. What is the height difference from where Drake throws the ball to where his Dad catches it?

A.  9.8 m

B.  24.0 m

C.  19.6 m

D.  39.2 m

E.  need more information

5.   How many pieces of popped popcorn does it take to fill our lecture hall JHE 376?

A.  106

B.  109

C.  1011

D.  1014

E.   1017

6.   The coefficient of kinetic friction between the block and the inclined surface of the figure below is 0.3 and the coefficient of static friction is 0.9. Each block is 1 kg. The pulley is frictionless and the string is           massless. What is the magnitude of the acceleration of the blocks if the system is released from rest?

where  is a dimensionless constant, h is Planck’s constant with dimensions [ML2/T], e is the charge of an electron with dimensions [AT], and c is the speed of light with dimensions [L/T]. What are the dimensions of 0?

A.  Dimensionless

B.  [ML/A2T2]

C.  [ML/A2T]

D.  [ML2/A2T2]

E.  [ML2/AT2]

9.   A cheetah can sprint at a speed of 95.0 km/h. The best a human is capable of is a speed of 37.5 km/h. A man and a cheetah are initially 0.500 km apart and both are running at their top speed. The cheetah is chasing the man, who is running away. Assume both the cheetah and man are travelling in the same direction along a     straight line. How long does it take the cheetah to overtake the man?

A.  0.523 s

B.  13.6 s

C.  19.2 s

D.  31.3 s

E.  87 s

10. A car approaches a barrier at a speed of 20 m/s along a level road. The driver applies the brakes at a distance of 52 m from the barrier. What minimum coefficient of kinetic friction is required to stop the car before it     hits the barrier?

D.  The average speed over the 30s is zero.

12. A hiker descends from a canyon in the Rockies Mountains to the river below. During this hike, the work done by the gravity on the hiker is:

A.  Zero.

B.  Positive and depends on the path taken by the hiker.

C.  Negative and depends on the path taken by the hiker.

E.  Negative and independent of the path taken by the hiker.

13. Physics Girl pulls a sled with a birthday cake east along level ground as shown in the diagram below. The cake does not slide with respect to the sled. Physics Girl is slowing to a stop and the cake and sled are also slowing to a stop at the same rate as Physics Girl. If we ignore air resistance, what forces are acting on the birthday cake?

A.  Normal force up, gravity down.

B.  Normal force up, gravity down, static friction east. C.

D.  Normal force up, gravity down, kinetic friction west.

E.  Normal force up, gravity down, kinetic friction east.

A.  21.0 N

B.  44.5 N

D.  73.5 N

E.  85.6 N

17. A very thin oil film (n=1.25) floats on water (n = 1.33). What is the thinnest film that produces a strong reflection for green light with a wavelength of 500 nm?

A.  200 nm

B.  300 nm

C.  400 nm

D.  500 nm

E.  600 nm

18. An experimental way to tune a soda bottle is to compare its         frequency with that of a 360 Hz tuning fork. Initially, a beat        frequency of 8 Hz is heard. A small amount of water is removed, and the beat frequency decreases steadily to 6 Hz. What are the  initial and final frequencies of the bottle, respectively?

A.  368 Hz, 366 Hz

B.  368 Hz, 354 Hz

C.  352 Hz, 366 Hz

D.  352 Hz, 354 Hz

E.  Either A or D

21. A pipe that is closed at both ends resonates at its fundamental frequency fc . Both ends of the pipe are       uncovered and the pipe is again made to resonate at its fundamental frequency fo . Which statement below correctly relates these two frequencies?

A. fc =fo

B. fc  >fo

C. fc < fo

D.  B or C could be correct

E.  Impossible to tell without knowing the length of the pipe

22. A beam of light passes from air into water. Which statement is necessarily true?

A.  The frequency is unchanged and the wavelength increases.

C.  The wavelength is unchanged and the frequency decreases.

D.  Both the wavelength and frequency increase.

E.  Both the wavelength and frequency decrease.

23. The figure shows the path of a portion of a ray of light as it passes through three different materials. What can be concluded concerning the refractive indices of these three materials? The figure is drawn to scale.

26. A person who weighs 628 N is riding a mountain bike on a flat horizontal road. The bike has a weight of

100 N. Suppose the entire weight of the rider and bike is supported equally by the two tires. If the gauge pressure in each tire is 8.09  105 Pa., what is the area of contact between each tire and the ground?

A.  11  10-4 m2

B.  9.9  10-4 m2

C.  6.9  10-4 m2

D.  4.5  10-4 m2

E.  2.5  10-4 m2

27. An open-closed tube of length 2.5 m is vibrating with a frequency of 170 Hz. If the speed of sound is

340 m/s, what harmonic is the tube the tube vibrating at? (i.e. what is n?)

A.  n = 1

B.  n = 2

C.  n = 3