Denis swims the length of a 40. meter pool in 10. seconds and immediately swims back to the starting position in another 15. seconds. What was his average speed?
What will be an ideal response?
Avg speed 3.2 m/s.
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A hole of radius 1.0 mm forms in the bottom of a very large water storage tank that holds water to a depth of 15 m. At what volume rate will water flow out of the hole?
A) 5.4 × 10-6 m3/s B) 5.4 × 10-7 m3/s C) 5.4 × 10-5 m3/s D) 5.4 × 10-4 m3/s
A person who normally weighs 700 N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator, what would the scale read?
A) more than 700 N B) less than 700 N C) 700 N D) It could be more or less than 700 N, depending on whether the elevator is going up or down.
It requires 0.30 kJ of work to fully drive a stake into the ground. If the average resistive force on the stake by the ground is how long is the stake?
A) 0.36 m B) 0.23 m C) 0.31 m D) 0.41 m
If a vibrating object has a frequency of 8 cycles per second, what is its period?
a. 8 seconds. b. 1/8 second. c. 640 seconds. d. 1/640th of a second. e. 1280 seconds.