How long until person on fifth floor see ball by window
A person on the 20th floor (66 m above ground) of a building reaches out and throws a ball directly upwards at 13 m/s. How long (secs) until a person on the 5th floor (16.5 m) see the ball go by the window?
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Transverse waves with a speed of 43.0 m/s are to be produced on a stretched string. A 5.35-m length of string with a total mass of 0.0600 kg is used. What is the required tension in the string?
The coefficient of kinetic friction between the block and the ramp is 0.76. Use energy conservation to find the distance the block slides before coming to rest.
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A helium nucleus and a neon nucleus are separated by a distance of 3.0 nm.The charge of the helium nucleus is +2e while that of a neon nucleus is + 10e. Find the magnitude of the electrostatic force they exert to one another.
At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically? The acceleration of gravity is 9.8 m/s2 .
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