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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
an electric motor lifts an elevator car at the constant speed of 2 ms the power consumed by the motor to perform this
a hoop a disk and a solid sphere each have mass of 14 kg and a diameter of 16cm starting from rest all three objects
a hard disk in your computer spins at 5400 rpm if this disk turns through 12 revolutions before coming to a stop find
a spy satellite was launched into a circular orbit with a height of 318 km above the surface of the earth determine its
a jet airplane flying over chyenne wyoming has an air speed of 260 ms in a direction 50 degrees south of west it is in
what is the magnitude of the free-fall acceleration of a ball mass m due to the earths gravity at an altitude of 7r
an unknown amount of current when passed through a resistance of r1 develops a voltage of 100 v and when passed
put a 220 lb man presses the brakes with a force of 28 lbsin2 to stop his car while traveling at a speed of 48 mihr if
two musicians are playing two pieces of the same instrument so that the sound produced by the first musician has a
the radius of a black hole is the distance from the black holes center at which the escape speed is the speed of lighta
a sphere of copper is subjected to 811 mpa of pressure the copper has a bulk modulus of 130 gpa by what fraction does
three point charges are placed on the x-axis a share of 333 micro c is at the origin a charge of -507 micro c is at