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A cord is used to vertically lower an initially stationary block of mass M = 30 kg at a constant downward acceleration of g/5. When the block has fallen a distance d = 1.5 m, find the work done by the cord's force on the block. Find the kinetic energy of the block. Find the speed of the block.
The drawing in problem 11 chapter 9 shows a person (W=584N) doing push ups. Find the normal force exerted by the floor on each hand
Blocks of mass 20, 80, and 240 kg are lined up from left to right in that order on a frictionless surface so each block is touching the next one. What is the magnitude of the force that the left block exerts on the middle one
A ball is thrown horizontally from a height of 19.8 m and hits the ground with a speed that is three times its initial speed
find the work done by the field on the electron. What is the change in potential energy associated with the electron.
A wheel with a tire mounted on it rotates at the constant rate of 2.87 times a second. find the tack's tangential speed
how much weight must each man support. by how much would the temperature of the air rise over a period of 2.0 h due to the metabolism of the people.
A 11.9-g mass is suspended 1.47 cm above a nonconducting flat plate, directly above an embedded charge of q. by how much will the mass be changed
A trained dolphin leaps from the water with an initial speed of 10.2 . The trainer releases the ball at the horizontal distance of 5.47 away, At what height does the dolphin catch the ball
An object is placed directly between a large planet and a star. Find the distance from the planet for which the net gravitational force exerted by the planet
A violinist is tuning the A string on her violin by listening for beats when this note is played simultaneously with a tuning fork of frequency 440 Hz. What was the frequency of the mistuned A string
When the starter motor on a car is engaged, there is a 330A current in the wires between the battery and the motor. Suppose the wires are made of copper and have a total length of 1.5m .
Find the temperature rise of the bullet assuming the impact occurs so rapidly that the impact process can be considered to be adiabatic. For lead, use fu = 0.0130(T) in Btu/lbm, where T is in °F or R.
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