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The density of water is 1000 kg/m3. A block of wood ofuniform density floats so that exactly 3/4 of its volume isunderwater. What is the density of the block?
An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 754 N. what is the weight of the sand and box in that situation
a pressurized container holds 3 kg of steel immersed in 2 l of water. the pressure inside the container is 300 kpa and
Objective questions based on kinematics.
As a positron moves through a region of space, its speed increases from 2.80 106 m/s to 8.00 106 m/s. Across what potential difference did the positron travel
while standing in a low tunnel you push up on the ceiling with a force of 100N. your mass is 70kg. What force does the floor exert on you
A box is pushed a distance d along a ramp at a constant speed by a horizontal force, Fa. The mass of the box is m. The ramp is inclined at an angle of ? above the horizontal.
A 0.350kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.850m/s when it makes a head-on collision with a stationary 0.150kg glider. Find the Final Kinetic Energy of first glider
In an experiment performed at the bottom of a very deep vertical mine shaft, a ball is tossed vertically in the air with a known initial velocity of 10.0 m/s, calculate the depth of the shaft
question the gas inside a flexible container e.g. a balloon is allowed to expand against a constant external pressure
All the pulleys are frictionless, and the strings are massless. Illustrate what are the tensions in all the strings and what are the acceleration of the masses?
An engine absorbs 1.69 kJ from a hot reservoir at 277°C and expels 1.22 kJ to a cold reservoir at 27°C in each cycle. (a) What is the engine's efficiency? % (b) How much work is done by the engine in each cycle? J (c) What is the power output of the ..
A 0.477 kg block of wood hangs from the ceiling by a string, and a 0.0680 kg wad of putty is thrown straight upward, How high does the putty-block-system rise above the original position of the block
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