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A person standing on a 50 m cliff throws a rock upward at 26.5 m/s. How long will it take for the rock to reach the ground? Hint: determine the final velocity first.
An object is thrown from from the ground upward with an initial speed of 3.75 m/s. How long will the object be in the air before it lands on the ground?
An object is thrown vertically downwards with speed 5m/s, while another object is thrown vertically downwards with speed 10m/s. Which object undergo greater change in speed in a time of 2 second? (g=9.8)
4. A person stands in an elevator. The person has a mass of 6.0 x 101 kg. Calculate the apparent weight of the person when the elevator is accelerating downwards at 2.5 m/s2.
A fire engine is being driven away from you at a speed of 15.4 m/s. One of the notes in its siren sequence has a fundamental frequency of 244 Hz. If the speed of sound is 338 m/s, the fundamental frequency of that particular note will seem to you to be ___Hz.
The speed of sound is 340 m/s where a tuning fork produces the second resonance position above a closed air column that is 49.8 cm in length. The frequency of the tuning fork is ___ Hz. (Give your answer with the correct number of sig digs and do not include units in your answer)
The speed of sound where a tuning fork of frequency 262 Hz produces the third resonance position above a closed air column that is 1.59 m in length is ___m/s. (Give your answer with the correct number of sig digs and do not include units in your answer)
An electric motor has a power rating of 1.60 kW and operates at 75% efficiency. The amount of work that it can do in 1.0 hrs is ___x106 J. Give your answer with the correct number of sig digs and do not include units)
The amount of power the quad-seat chair requires just to overcome gravity is ___x104 W. (Give your answer with the correct number of sig digs and do not include units)
An automobile is approaching you at a speed of 90.0 km/h and sounding its horn. The fundamental frequency of the horn sounds to you like 268 Hz. If the real fundamental frequency of the horn is 248 Hz, the speed of sound is ___m/s. (Give your answer with the correct number of sig digs and do not include units.
