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On a highway curve with radius 50m, the maximum force of static friction (centripetal force) that can act on a 1,000kg car going around the curve is 8,000N. What speed limit should be posted for the curve so that cars can negotiate it safely.
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Question: An outfielder throws a 0.150 kg baseball at a speed of 40.0m/s at an intial angle of 30.0 with respect to the horizontal. a) what is the kinetic energy of the baseball at the highest point of its motion? b) wha ...
An oil film (n = 1.48) floating on water (n = 1.33) is illuminated by white light at normal incidence. The film is 274 nm thick. The reflected light will be predominately a single color. Find the wavelength of the domina ...
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Swimming at 1.50 m/s relative to still water, a swimmer heads directly across a river of width 80 m. He arrives 45.0 m downstream from the point directly across the river from his starting point. (a) What is the speed o ...
Question: The sun emits electromagnetic waves with a power of 4 x 1026W. a) Determine the intensity of electromagnetic waves from the sun just outside the atmospheres of Venus. b) Determine the intensity ofelectromagneti ...
Question: You are standing on a skateboard, initially at rest. A friend throws a very heavy ball towards you. You can either catch the object or deflect the object back towards your friend (such that it moves away from y ...
A clock is set against an accurate standard and 30 days later is found to be in error by 12 seconds. What is the percentage of error in its time keeping?
Question: Some plants disperse their seeds when the fruit splits and contracts, propelling the seeds through the air. The trajectory of these seeds can be determined with a high-speed camera. In an experiment on one type ...
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