Physics, 20.05.2020 16:58 59279

What does it mean if the coefficient of friction is high or if it's low?

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Physics, 23.06.2019 00:50, Madisonaubrey22

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping. the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?

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Physics, 23.06.2019 08:00, edjiejwi

Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?

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Physics, 23.06.2019 10:30, Garrell

Arock, thrown straight up, takes 4.2 seconds to reach its max height (g=9.8m/s) what was the initial velocity? what was its maximum height?

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Physics, 23.06.2019 16:00, andria89

Which tools do meteorologists use to create weather forecasts? check all that apply. a)guesses b)computer models c)weather service maps d)data from instruments e)personal observations