16. 6 cm 4 cm 3 cm 8 cm 17. A ball of mass 3.0 kg is tied to the end of a 50-cm

Question

16.

6 cm

4 cm

3 cm

8 cm

17.

A ball of mass 3.0 kg is tied to the end of a 50-cm length of string. The ball and string are swung in a circle in a vertical plane at constant speed v, which is the minimum speed necessary to keep the string taut at all times. The center of the circle is a distance h=190cm above the floor.

What is the speed of the ball?

1.7 m/s

3.0 m/s

3.7 m/s

2.2 m/s

18.

19.

An astronaut in a spacecraft looks out her window and observes a comet travel in the opposite direction at a relative speed of 237 m/s. The velocity of the spacecraft is 114 m/s directly away from the sun. What is the comet's velocity relative to the sun? Assume that motion away from the sun is in the positive direction.

-351 m/s

-123 m/s

123 m/s

351 m/s

16.

The graph illustrates one moment in the propagation of a transverse wave down a rope. What is the amplitude of the wave?

6 cm

4 cm

3 cm

8 cm

Explanation / Answer

amplitude is the maximum transverse displacement

from the graph the maximum transverse point = A = 3 m

+++++++++++++

the minimum speed reqiured = sqrt(r*g)

v = sqrt(9.8*0.5) = 2.2 m/s

++++++++

a force equal in magnitude to F2 and opposite in direction to F2

++++++++++++

VcA = -237

VAs = + 114 m/s

Vcs = VcA + VAs

Vcs = -237 + 114 = -123 m/s

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