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Q. A 1050 kg car carrying four 78 kg people travels over a rough "washboard" dirt road with corrugations 4.0 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude when its speed is 15 km/h. The car now stops, and the four people get out. By how much does the car body rise on its suspension owing to this decrease in weight?
Q. A 20kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole. A cable at an angle of 30 degrees with the beam supports the light. Find the tension in the cable and the horizontal and vertical forces exerted on the beam by the pole?
Resistance and potential difference in an electrical circuit.
An electron starts from rest 75.5 cm from a fixed point charge with Q = -0.150 µC. How fast will the electron be moving when it is too far away.
An observer on the ground watches the boy throw the can and catch it. In this observer's ground frame of reference, explain the shape of can's path and determine the initial velocity of the can.
Objective questions based on work, energy, power.
A contact lens is made of plastic with an index of refraction of 1.36. The lens has an outer radius of curvature of +1.91 cm and an inner radius of curvature of +2.41 cm. What is the focal length of lens?
Two speakers, one straight behind the other, are each generating a 285 Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? Suppose that the s..
How much force, in Newtons, is needed to accelerate a truck with a mass of 1500 kilograms from a full stop to 40 m/s in 10 seconds if the rate of acceleration is constant.
Using and Atwood machine with masses m1 and m2, at first with m1 a distance 2h above m2, what is the speed of either mass they pass each other? Make use of energy to solve (hint they cross halfway between the starting positions of the two masses).
A stone is thrown at a bell with the speed of 20m/s. The stone strikes the bell and the sound is heard 2.60 s after the stone was released. Speed of sound is 342m/s, how far is the boy from bell.
A passenger train is travelling at 31 m/s when the engineer sees a freight train 351 m ahead of his train travelling in the same direction on the same track. The freight train is moving at a speed of 5.6 m/s.
A thermos contains 165 cm3 of coffee at 85° C. To cool the coffee, you drop two 14-g ice cubes into the thermos. The ice cubes are at first at 0° C and melt completely. What is the final temperature of coffee? Treat the coffee as if it were water.
Compute the position, velocity vector and the distance attained by athlete in a long jump event.
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