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1.
An airplane flies 250.0 km at 300 m/s. How long does this take?: 830 s

2.
An automobile moves at constant speed down one hill and up another hill along the smoothly curved surface shown above. Which of the following diagrams best represents the directions of the velocity and acceleration of the automobile at the instant that it is at the lowest position as shown?: velocity right, acceleration up.

3.
A ball attached to a string is whirled around in a horizontal circle having a radius r. If the radius of the circle is changed to 4r and the same centripetal force is applied by the string, the new speed of the ball is which of the following?: Twice the original speed

4.
A block of mass 3m can move without friction on a horizontal table. This block is attached to another block of mass m by a cord that passes over a frictionless pulley, as shown above. If the masses of the cord and the pulley are negligible, what is the magnitude of the acceleration of the descending block?: Zero

5.
A block of mass m is accelerated across a rough surface by a force of magnitude F that is exerted at an angle 0 with the horizontal, as shown above. The frictional force on the block exerted by the surface has magnitude f. What is the acceleration of the block?: (Fcos0-f)/m

6.
A block on a horizontal frictionless plane is attached to a spring, as shown. The block oscillates along the x-axis with amplitude A. Which of the following statements about energy is correct?: The potential energy of the spring is at a minimum at x=0

7.
A car travels 40.0 km east, 120 km north in 1.5 hours. What is its average velocity?: 23 m/s at 72*

8.
The circumference of earth is 4.007 x 10^7 m. Find the radius of the Earth in km.: 6.377 x 10^3 km

9.
A construction laborer holds a 20 kg sheet of wallboard 3 m above the floor for 4 seconds. During these 4 seconds, how much power was expended on the wallboard?: none of these

10.
Convert 35,205,350 um to hm: 0.35205350 hm

11.
Convert 720 ds to ns.: 7.20 x 10^10 ns

12.
Each of the diagrams below represents two weights connected by a massless string which passes over a massless, frictionless pulley. In which diagram will the magnitude of the acceleration be the largest?: 1 kg and 2 kg

13.
F = (9.0 x 10^9)(4.2x10^-9)(2.1x10^-9).......: 8.3

14.
The free fall trajectory of an object thrown horizontally from the top of a building is shown as the dashed line in the figure. Which sets of arrows best correspond to the directions of the velocity and of the acceleration for the object at the point labeled P on the trajectory?: Velocity right/down. Acceleration down.

15.
If a bathroom scale reads 150 pounds, what would the equivalent mass be in kg?: 68 kg

16.
If the potential energy is zero at point II, where will the kinetic and potential energies of the ball be equal?: At point III

17.
In which of the following situations would an object be acceerated?: It moves with uniform circular motion. & It travels as a projectile in a gravitational field with negligible air resistance.

18.
The motion of a circus clown on a unicycle moving in a straight line is shown in the graph below. What would be the acceleration of the clown at 5 s?: 2.0 m/s^2

19.
A pendulum bob of mass m on a cord of length L is pulled sideways until the cord makes an angle 0 with the vertical as shown in the figure to the right. The change in potential energy of the bob during the displacement is:: mgL(1-cos0)

20.
A pendulum is pulled to one side and released. It swings freely to the opposite side and stops. Which of the following might best represent graphs of kinetic energy (Ek), potential energy (Ep) and total mechanical energy (Er): EpU

21.
Robin Hood aims his longbow horizontally at a target's bull's eye 30 m away. If the arrow strikes the target exactly 1.0 m below the bull's eye, how fast did the arrow move as it was shot from the bow? Assume air resistance is negligible.: 67 m/s

22.
Solve for unkown 0.46sin85.0*=5.4cos0: 85.1*k

23.
The speed of the ball at point II is most nearly: 4.5 m/s

24.
When a person stands on a rotating merry-go-round, the frictional force exerted on the person by the merry-go-round is: opposite in direction to the frictional force exerted on the merry-go-round by the person

25.
When an object of weight W is suspended from the center of a massless string as shown above, the tension at any point in the string is: W/(2cos0)

26.
While riding his bike on vacation in Canada, Little Joey Johnson made sure his speedometer read a constant 8.5 miles per hour. He rode from downtown Vancouver to nearby Langley and back, a round trip distance of 64 km. How long was he gone.: 4.7 hours

27.
X=1.45 m/s and Y=2.0 m/s, what is the resulting vector and the direction?: 2.5 m/s at 54*

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