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Q. A 6-kg block slides along a frictionless horizontal surface. The block is acted on by two forces, a 4.5 N force to the left, and a 7.5N force to the right. At what rate is the 4.5N force doing work on the block at the instant when its speed is 4.0m/s.
Q. An ice skater is spinning at 20rad/s about her longitudinal axis when she abducts her arms and doubles here radius of gyration about her longitudinal axis from 30 to 60cm. if her angular momentum is conserved, what is her angular velocity about her longitudinal axis after she increases her radius of gyration?
A 12 kg mass starts from rest and slides down an inclined plane 8.0 10-1 m long in 0.9 s. What net force is acting on the mass along the incline?
Two meteoroids are heading for earth. Their speed as they cross the moon's orbit is 2.3 km/s. The second meteoroid misses for earth by 2680 km. What is its speed at its closest point.
What is mass of the ice cube
A driver in a car travelling at a speed of 58.0 mi/h sees a deer 126 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assume that the deer does not move in the meantime).
Find the angle with respect to the ground
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.
What is the ratio of the amplitude of the damped oscillation
Two cars are travelling on a dirt road between 3 consecutive poles after 5.40s they are side by side at next telephone pole. The distance between the poles is 66.30m.
An old trick to find out if a train is coming is to put your ear on the rails of the track. Why is this more effective than just listening for the sounds the train makes in air.
IP Halley's Comet Halley's Comet, which passes around the Sun every 78 years, has an elliptical orbit. When closest to the Sun (perihelion) it is at a distance of 8.823 x 10^10 m and moves with a speed of 54.6 km/s. The greatest distance between Hall..
A 1050 kg car carrying four 84 kg people travels over a rough "washboard" dirt road with corrugations 4m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude while its speed is 24km/h. The car now s..
Find out the longest wavelength electrons that can produce a first-order maximum.
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