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a 25 kg swings on a playground swing if the swing hangs down 3 m from the top bar and the child swings out 20 degrees
the work function of a particular substance is 415 times 10-19 j what is the photoelectric cutoff wavelength for this
a light ray is incident on the outer surface of the crystalline at an angle of 425deg with the normal find the angle
a cylinder contains 225 mol of helium gas at 210degc assume that the helium behaves like an ideal gasa find the total
the temperature of 200 moles of argon gas is lowered from 280 x 102 k to 190 x 102 ka find the change in the internal
what is the radius of a hydrogen-filled balloon that would carry a load of 3700 n in addition to the weight of the
a styrofoam box has a surface area of 079 m2 and a wall thickness of 20 cm the temperature of the inner surface is
a bar of lead bar a is in thermal contact with a bar of silver bar b of the same length and area one end of the
a guitar string is vibrating in its fundamental mode with nodes at each end the length of the segment of the string
the surface pressure on venus is 9200 atm and the acceleration due to gravity there is 0894 g in a future exploratory
as you bounce a tennis ball of mass 510 10-2 kg off a wall its velocity changes from vx 108 ms to vx -79 ms find the
a find the linear momentum and kinetic energy of a bullet of mass 460 10-2 kg moving at a speed of 320 mslinear
telephone signals are often transmitted over long distances by microwaves what is the frequency of microwave radiation
the radius of the moon is about 0273 times the earth radius its mass is about 00123 times the mass of the earth use
a basketball is released from a height of 200 m above the floor and enters a basket that is 30 m above the floor the
you exert a force as shown in the diagram to push a large crate of books about 1 m high m 450 kg across a rough floor
a how much heat is needed to raise the temperature of a 10-kg steel pot containing 20 kg of water from 25degc to the
the electric motor of a model train accelerates the train from rest to 0820 ms in 185 ms the total mass of the train is
a 650 kg elevator starts from rest it moves upward for 450 s with constant acceleration until it reaches its cruising
a spaceship is launched from the earths surface with a speed v the radius of the earth is r what will its speed be when
standing on the surface of a small spherical moon whose radius is 630 104 m and whose mass is 800 1018 kg an astronaut
a satellite is in circular orbit around the earth at a distance of 714re with a speed of 296 kms with what speed would
in preparation for a demonstration on conservation of energy a professor attaches a 72-kg bowling ball to a 29-m-long
mammals that depend on being able to run fast have slender lower legs with flesh and muscle concentrated high close to
an object with a mass of 10 kg is resting on a wedge that is 32 degrees from horizontal what is the normal force