Hello, dear friend, you can consult us at any time if you have any questions, add WeChat: YSYY66

PHYSICS 1A03 Final Examination Version 1

2017

1. How many significant figures should be written in the sum of:

9440.439 kg + 9.032 kg + 4.5 kg + 1680.007 kg?

A. 2

B. 3

C. 5

E. 8

2. Suppose A = (13pC)/B2 , where A has dimension [M2/L] and B has dimension [L/T2]. What is the dimension of C?

A. [T2/M]

B. [MT]

C. [L/MT]

D. [M2/T2]

E. [LM2/T4]

3. How many times does a person blink in a typical lifetime?

A. 5 x 105

C. 5 x 1011

D. 5 x 1014

E. 5 x 1016

4. For the formula given, which relationship, when plotted on a graph, would yield a straight line? C =

A. a plot of 1/Q vs. C (A, T held constant)

(Q, C held constant)

(C, T held constant)

(Q, A held constant)

(C, A held constant)

5. A box is sitting in the back of a truck. The truck is accelerating towards the north without the box slipping. The direction of the friction force exerted on the box by truck is:

A. To the east

B. To the west

C. To the south

D. To the north

E. Since the box is not slipping, there is no friction

6. You wish to move a heavy box on a rough floor. The coefficient of kinetic friction between the box and the floor is 0.9. What is the best way to reduce the force of friction between the box and the floor while the box is moving?

A. Push or pull the box with a force parallel to the floor.

B. Pull the box with a force directed up at an angle of 30 ° from the horizontal.

C. Push the box with a force directed down at an angle of 30° from the horizontal.

D. The coefficient of friction does not change so the force of kinetic friction acting on the block must be

constant.

E. Both B and C result in the same force of friction.

7. Which of the following is the most correct acceleration-time graph for the position-time graph given?

ANSWER C

E . Either C or D could be the correct acceleration-time graph.

8. Two objects are moving to the right. Object 1 catches up with object 2 and collides with it. The objects stick together and continue with velocity v f . Which of these statements is true?

A. v f = v 1

B. v f < v 2

C. v f > v 1 D. v 1 > v f > v 2

E. It is not possible to decide without knowing the masses.

9. Two balls are shot off a rooftop at the same time. They have the same

initial speed, and same angle from the horizontal, but opposite directions

as shown. (The vertical component of the velocity is the same, and the

horizontal components

The separation between the balls increases at a constant rate.

The separation between the balls decreases at a constant rate.

E. The separation between the balls remains constant as they fall.

10. Einswine loves a good physics experiment and decides to demonstrate some concepts by jumping out of an airplane. He jumps out of the airplane and after free falling for a few seconds opens his parachute and descends safely to the ground at a constant velocity. Which is the correct free body diagram during the

descent to the ground, with the parachute open? ANSWER E

11. A rock is kicked from ground level at an 80 degree angle above the horizontal. The vertical component of the velocity is 15.0 m/s upwards. The rock lands in a hole that is 20.0 m below ground level. How long is the rock in the air, from the instant it is kicked until it hits the bottom of the hole?

A. 0.30 s

C. 6.7 s

D. 9.8 s

E. cannot be determined since only the vertical component of the velocity was provided.

12. A man pulls a 100 N crate up a frictionless hill with a slope of 30o. The crate is raised by 5 m as shown. Assuming the crate moves at constant speed, the work done by gravity is:

B. 500 J

C. -250 J

D. 250 J

E. 0 J

13. Two blocks, connected by a massless string over a frictionless, massless pulley, slide along the frictionless ramp shown in the diagram. What is the tension in the string?

A. 6.7 N

C. 28 N

D. 37 N

E. 42 N

14. Einswine (mass 2 M ) slides down a ramp and collides with Physics Girl (mass M ), taking her for a ride. Calculate their final speed together, if Einswine’s initial height is h = 30 m.

A. 13.2 m/s

B. 16.2 m/s

C. 19.8 m/s

D. 27.4 m/s

E. Need to know M

15. Cart A is travelling at 3 m/s (south) and Cart B is travelling at 6 m/s (north). After they collide Cart A has a

velocity of 6 m/s (north). What type of collision has occurred if Cart A and Cart B have the same mass?

B. Inelastic

C. Perfectly inelastic

D. Bouncy

E. This collision is not physically possible

16. Image 1 shows a diffraction pattern for light of wavelength λ1 passing through a single slit of width w 1 . What needs to be changed to the experimental setup to create the diffraction pattern shown in image 2?

A. increase the frequency of the light

B. increase the slit width

C. decrease the wavelength of light

D. increase the wavelength of light

E. Either B or D would create the pattern shown in image 2

17. Two similar pulses on a string with opposite orientations approach each other at speeds of 1 m/s.

Which of the following best represents the shape of the pulse 4s later?

18. A transverse wave on a string is described by y ( x , t ) = A cos( ωt + kx ). It arrives at the point x = 0 where the string is fixed in place. Which function describes the reflected wave?

A. y ( x , t ) = A cos( ω t + kx )

B. y ( x , t ) = A cos( ω t – kx )

C. y ( x , t ) = – A cos( ω t + kx )

D. y ( x , t ) = A cos( ω x + k t )

E. y ( x , t ) = – A cos( ω t – kx )

19. A pipe, open at both ends, has a frequency of 150 Hz while vibrating in the mode shown in the figure below. The fundamental frequency of the pipe is:

A. 25 Hz B.

C. 100 Hz

D. 150 Hz

E. 450 Hz

20. A standing wave on a string vibrates as shown. Suppose the mass density is quadrupled (made four times larger) while the frequency and the length of the string are held constant. Which standing wave pattern is produced?

21. At t = 0, two traveling pulses are created on either end of a string, as shown in the graph of displacement vs. position (snapshot diagram) below. The pulses are identical and travel toward each other with the same

speed. Which of the sketches of po s iti on a s a f unc ti on o f ti m e (history diagram ) best represents the vertical displacement of point P in the diagram? ANSWER A

history diagram

What can you conclude from the diagram?

A. The linear mass density of B is smaller than the linear mass density of A.

B.

24. In a Young ’s double slit experiment like the one shown to the right,

if everything else were held constant, which of the following changes

would increase the separation between adjacent maxima on the

screen?

A. Increase the frequency, f, of the incident light

B. Increase the index of the refraction, n, of the medium in which the setup is immersed.

C. Decrease the separation between the slits, d.

D. Decrease the distance to the screen, L.

E. None of the above.

25. A pair of thin slits is illuminated with a red laser emitting light at 650 nm. On a screen 1.5 m behind the slits, the separation of the bright fringes is 12 mm. What is the distance between the two slits?

(1 nm = 10-9 m, 1 µm = 10-6 m)

A. 36 µm

B. 54 µm C. 81 µm

D. 520 µm

E. 970 µm

26. A glass slide is covered with an anti-reflective coating which is meant to m i n i m i z e t h e r e f l ec ti o n of green light (l = 510 nm). If the index of refraction of the glass is 1.5 and the index of refraction of coating is 1.2,

what is the minimum thickness of the coating?

A. 170 nm

C. 128 nm

D. 213 nm

E. 85.0 nm

27. A stationary diver has tied himself to the bottom of a pond with a rope. If his body has a density of

900 kg/m3, a mass of 100 kg, a volume of 0.111 m3 , and the water has a density of 1000 kg/m3 , what is the tension in the rope?

A. 0 N

B. 11 N

D. 980 N

E. 1100 N

28. The plug for the drain of a water reservoir is located 3.0 m below the surface. The plug is circular and has a diameter of 5.0 cm. If the density of water is 1000 kg/m3, how much force is required to remove the plug (you may ignore the weight of the plug itself)?

29. When a straw is dipped into a cup filled with water you notice that the water level inside the straw is raised by a value h above the water level in the cup. If a droplet of water is placed on a flat surface made from the same material as the straw which of the following are you most likely to observe? ANSWER C

D. Any of the above cases is possible.

E. Depends on the diameter of the straw.

30. A strangely shaped bottle is designed to test pressure in various locations within it. A liquid partially fills the bottle to the level indicated. Rank the positions labeled a to e from the lowest to highest pressure.

A. a < e < b < c = d

B. a = e < b < c = d

C. a = e < b = c = d

D. c = d < b < a = e

E. b < c = d , and a and e are lower than the others but the order cannot be known from the diagram.