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A helicopter is ascending vertically with a speed of 5.0 m/s. At a height of 14 meter above the Earth, a package is dropped from a window. Find how much time does it take for the package to reach the ground?
A machine part has the shape of a solid uniform sphere of mass 225g and diameter 3.50cm. Find its angular acceleration
A balloon is filled with helium gas at 20.0 degrees C and 1.0 atm pressure (1 atm = 1.01 x 10^5 N/m^2). What is the heat gained or lost by the helium
a circuit consists of an ideal ac generator a 30 microf capacitor and an 75? resistor all connected in series. the
A cube of wood having an edge dimension of 22.0 cm and a density of 650 kg/m3 floats on water. What is the distance from the horizontal top surface of the cube to the water level?
a certain capacitor stores 380 j of energy when it holds 7.2 x 10-2 c of charge. a what is the capacitance of this
An ideal gas at 26.9°C and a pressure 1.60 105 Pa is in a container having a volume of 1.00 L. Determine the number of moles of gas in the container
An aluminum rod is 18.0 cm long at 20°C and has a mass of 350 g. If 12500 J of energy is added to the rod by heat, what is the change in length of the rod
Before landing astronauts on the moon, the Apollo 11 space vehicle was put into orbit around the moon. Calculate the ratio of densities (moon to earth)
A satellite has a mass of 6480 kg and is in a circular orbit 6.12 x 104 m above the surface of a planet. The period of the orbit is 2.00 hours. What is the true weight of the satellite when it is at rest on the planet's surface
In a student experiment, a constant-volume gas thermometer is calibrated in liquid nitrogen (?196°C ) and in boiling pentane (36.1°C). The separate pressures are 0.349 atm and 1.442 atm.
A proton with a velocity in the positive x-direction enters a region where there is a uniform magnetic field B in the positive y-direction, The electric field should be in the...which direction
A 47.3-kg skater is standing at rest in front of a wall. Bypushing against the wall she propels herself backward with avelocity of -2.41 m/s. Her hands are in contact with the wall for1.19 s. Ignore friction and wind resistance.
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