The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be:

Select one:

a.m.

b.s.

c.m/s.

d.kg/s.

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An Earth satellite is orbiting at a distance from the Earth's surface equal to one Earth radius (4000miles). At this location, the acceleration due to gravity is what factor times the value ofgat the Earth's surface?

Select one:

a.There is no acceleration since the satellite is in orbit.

b.1/2

c.1/4

d.2

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A ball is rolled horizontally off a table with an initial speed of 0.21m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.3s. What is the height of the table? (g= 9.8 m/s2and air resistance is negligible)

Select one:

a.0.44m

b.0.38m

c.0.5m

d.0.01m

e.0.45m

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Alex throws a 0.10-kg rubber ball down onto the floor. The ball's speed just before impact is 5.5m/s, and just after is 3.5m/s. If the ball is in contact with the floor for 0.02s, what is the magnitude of the average force applied by the floor on the ball?

Select one:

a.45N

b.27.5N

c.17.5N

d.10N

e.0.9N

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6.3 Potential Energy

A pole-vaulter clears 5.00 m. With what speed does he strike the mat in the landing area?

Select one:

a.2.70 m/s

b.21.6 m/s

c.9.90 m/s

d.10.8 m/s

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The SI base units for spring constant are which of the following?

Select one:

a.kgm2

b.kgs2

c.kg/m2

d.kg/s2

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A bank vault is opened by applying a force of 300 N perpendicular to the plane of the door, 1.2 m from the hinges. Find the torque due to this force about an axis through the hinges.

Select one:

a.180 Nm

b.360 Nm

c.300 Nm

d.240 Nm

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Describes the period of the wave, as its frequency increases?

Select one:

a. increase, then decrease

b. decreases

c. increases

d. unchanged

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I walk six miles in a straight line in a direction north of east, and I end up four miles north and several miles east. How many degrees north of east have I walked?

Select one:

a.60

b.19

c.71

d.42

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How many significant figures are there in 2019.08?

Select one:

a. Six (6)

b. Four (4)

c. Three (3)

d. Five (5)