CLASS SECTION/SCHEDULE (FRI-AM, FRI-PM, SAT-AM, SAT-PM, SUN-AM, SUN-PM, ONLINE)

1.

If a firefly collides with the windshield of a fast-moving bus, which statement is correct?

a) The firefly experiences an impact force with a larger magnitude b) The bus experiences an impact force with a larger magnitude c) The firefly and bus experience forces with same direction d) The firefly and bus experience forces with same magnitude

A

B

C

D

2.

A heavy weight is supported by two cables that exert tensions of magnitude T1 and T2. Which statement is correct?

a) T1 = T2 b) T1y = T2y c) T1 < T2 d) T1 > T2

A

B

C

D

3.

The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator?

a) 11 m/s2 upward b) 1.2 m/s2 upward c) 1.2 m/s2 downward d) 10 m/s2 upward

A

B

C

D

4.

What is the smallest value of the force F such that the 2.0-kg block will not slide down the wall? The coefficient of static friction between the block and the wall is 0.2.

a) 98 N b) 20 N c) 10 N d) 4 N

A

B

C

D

5.

In a game of shuffleboard (played on a horizontal surface), a puck is given an initial speed of 6.0 m/s. It slides a distance of 9.0 m before coming to rest. What is the coefficient of kinetic friction between the puck and the surface?

a) 0.20 b) 0.18 c) 0.15 d) 0.13

A

B

C

D

6.

A

B

C

D

7.

A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?

a) 2.0 m/s2 down the incline b) 5.3 m/s2 up the incline c) 2.0 m/s2 up the incline d) 3.9 m/s2 down the incline

A

B

C

D

8.

If F = 40 N and M = 1.5 kg, what is the tension in the string connecting M and 2M ? Assume that all surfaces are frictionless.

a) 13 N b) 23 N c) 36 N d) 15 N

A

B

C

D

9.

A

B

C

D

10.

A roller-coaster car has a mass of 500 kg when fully loaded with passengers. At the bottom of a circular dip of radius 40 m (as shown in the figure) the car has a speed of 16 m/s. What is the magnitude of the force of the track on the car at the bottom of the dip?

a) 3.2 kN b) 8.1 kN c) 4.9 kN d) 1.7 kN

A

B

C

D

11.

An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 1000 m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?

a) 0.25 b) 0.50 c) 1.00 d) 2.00

A

B

C

D

12.

If the coefficient of static friction between the tires and road on a rainy day is 0.5, what is the fastest speed at which a car can make a turn with a radius of 80.0 meters? The road is flat.

a) 7 m/s b) 11 m/s c) 14 m/s d) 20 m/s

A

B

C

D

13.

A boy on board a cruise ship drops a 30.0 gram marble into the ocean. If the resistive force proportionality constant is 0.50 kg/s, what is the terminal speed of the marble in m/s?

a) 0.06 b) 0.294 c) 0.588 d) 60.0

A

B

C

D

14.

An object moving at constant velocity in an inertial frame must:

a) have a net force on it b) eventually stop due to gravity c) not have any force of gravity on it d) have zero net force on it

A

B

C

D

15.

Acceleration is always in the direction:

a) of the displacement b) of the initial velocity c) of the final velocity d) of the net force

A

B

C

D

16.

The inertia of a body tends to cause the body to:

a) speed up b) slow down c) resist any change in its motion d) fall toward earth

A

B

C

D

17.

Equal forces F act on isolated bodies A and B. The mass of B is three times that of A. The magnitude of the acceleration of A is:

a) three times that of B b) 1/3 that of B c) the same as B d) nine times that of B

A

B

C

D

18.

A brick slides on a horizontal surface. Which of the following will increase the magnitude of the frictional force on it?

a) putting a second brick on top b) decreasing the surface area of contact c) increasing the surface area of contact d) decreasing the mass of the brick

A

B

C

D

19.

Why do raindrops fall with constant speed during the later stages of their decent?

a) The gravitational force is the same for all drops b) Air resistance just balances the force of gravity c) The drops all fall from the same height d) The force of gravity is negligible for objects as small as raindrops

A

B

C

D

20.

A ball is thrown upward into the air with a speed that is greater than terminal speed. On the way up it slows down and, after its speed equals the terminal speed but before it gets to the top of the trajectory:

a) its speed is constant b) it speeds up c) it continues to slow down d) its motion becomes jerky

A

B

C

D

21.

A 60 kg crate is pulled across a level floor via a horizontal rope. The coefficient of kinetic friction between the crate and the floor is 0.4, and the coefficient for static friction is 0.5. Find the acceleration of the crate if the rope has tension 500 N IN m/s/s?

a) 4.3 b) 4.4 c) 4.5 d) 4.6

A

B

C

D

22.

A flatbed truck slowly tilts its bed upward to dispose of a 95.0kg crate. The bed is raised to an angle of 25° and the crate begins to slide. If the coefficient of kinetic friction between the bed of the truck and the crate is 0.3, what is the acceleration of the crate?

a) 1.3 b) 1.4 c) 1.5 d) 1.6

A

B

C

D

23.

Calculate the kinetic energy of a body which has a mass of 5 kg and a velocity of 10m/s.

a) 260 J b) 250 kJ c) 260 kJ d) 250 J

A

B

C

D

24.

Calculate the increase in internal energy of a gas in a closed system during a process in which -100 J of heat transfer and 400 J of work transfer take place.

a) 300 J b) 300 kJ c) 200 J d) 200 kJ

A

B

C

D

25.

During an expansion process, the pressure of a gas changes from 15 to 100 psia according to the relation P= aV + b, where a= 5 psia/ft3 and b is a constant. If the initial volume of the gas is 7 ft3, calculate the work done during the process.

a) 181 Btu b) 18.1 Btu c) 1.81 Btu d) 0.181 Btu

A

B

C

D

26.

A mass of 2.4 kg of air at 150 kPa and 12°C is contained in a gas-tight, frictionless piston–cylinder device. The air is now compressed to a final pressure of 600 kPa. During the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. Calculate the work input during this process.

a) 2720 kJ b) 272 kJ c) 27.2 kJ d) 2.72 Kj

A

B

C

D

27.

An ideal gas at a given state expands to a fixed final volume first at constant pressure and then at constant temperature. For which case is the work done greater?

a) Considering the area under the process curve, and thus the boundary work done, both are equal. b) Considering the area under the process curve, and thus the boundary work done, is greater in the constant volume case. c) Considering the area under the process curve, and thus the boundary work done, is greater in the constant pressure case. d) Considering the area under the process curve, and thus the boundary work done, is greater in the constant temperature case.

A

B

C

D

28.

A rigid tank contains air at 500 kPa and 150°C. As a result of heat transfer to the surroundings, the temperature and pressure inside the tank drop to 65°C and 400 kPa, respectively. Determine the boundary work done during this process.

a) 0 kJ b) 1 kJ c) 2 kJ d) 3 kJ

A

B

C

D

29.

A frictionless piston–cylinder device contains 10 lbm of steam at 60 psia and 320F. Heat is now transferred to the steam until the temperature reaches 400F. If the piston is not attached to a shaft and its mass is constant, determine the work done by the steam during this process

a) 100.4 Btu b) 96.4 Btu c) 90. 4 Btu d) 93. 4 Btu

A

B

C

D

30.

What is the meaning of “specific heat”?

a) The specific heat is defined as the energy required to raise the volume of a unit mass of a substance by one degree. b) The specific heat is defined as the energy required to raise the pressure of a unit mass of a substance by one degree. c) The specific heat is defined as the energy required to raise the temperature of a unit mass of a substance by one degree. d) The specific heat is defined as the energy required to raise the energy of a unit mass of a substance by one degree.