1. The speed of sound in air is 330m/s. In one hour sound could travel a distance of: A. 620 mi B. 743 mi C. 810 mi D. 1020 mi.

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Presentation transcript:

1. The speed of sound in air is 330m/s. In one hour sound could travel a distance of: A. 620 mi B. 743 mi C. 810 mi D mi

2. If the acceleration of an object is zero, the velocity must be: A. zero B. increasing uniformly C. decreasing uniformly D. constant The acceleration measures the rate of change of velocity. If the acceleration is zero the velocity is not changing and is therefore constant.

3. An object is initially traveling at 15 m/s. If 8 s later it is traveling at 65 m/s, its acceleration during those 8 s was: A. 1.9m/s 2 B. 2.5m/s 2 C. 4.4m/s 2 D. 6.25m/s 2

4. An object traveling at a constant velocity moves through a distance of 50m in 4s, if the object had traveled for 6s it would have moved through a distance of: A. 75 m B. 125 m C. 175 m D. 500 m

5. A stone is dropped into a well which is 122.5m deep. The sound of the splash would be heard after: (See question #1) A. 4.25s B. 5.37s C. 6.11s D. 6.98s

6. A 10 kg object dropped from a height of m will reach the ground in 5s. If a 5 kg object were dropped from the same height it would reach the ground in: A. 2.5 s B. 5 s C. 10 s D. 15 s The time for the object to fall only depends on its initial velocity and the height from which it is dropped and is independent of the object’s mass. Therefore a 5kg object dropped from the same height would reach the ground in the same time.

7. If an object is thrown straight up, when it reaches its maximum altitude its acceleration will be: A. zero B m/s2 C. 9.8 m/s2 D. depends on its altitude The acceleration of the object is caused by the earth’s gravity and is constant at -9.8m/s 2 near the earth’s surface.

8. A stone is dropped from a building and hits the ground 8 s later. The height of the building is: A m B. 245 m C m D. 490 m Since thew stone fell from the top of the building the height of the building was 313.6m.