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people often use the term energy crisis implying that we are running out of energy how can this be if energy is
a 15kw motor provides power for an elevator of a building what is the minimum time needed for the elevator to rise 30m
use newtons law of gravity to calculate the force on a 60 kg person on the surface of mars this force is their weight
given that an astronomical unit au is 150 x 1011 m and a light-year is 946 x 1015 m how many astronomical units are in
a pellet mass 12 kgnbspis launched vertically with an initial speed of 25 ms inside an infinitely-long narrow
a 125 kg mass oscillates on a spring with a period of 500 s during oscillation the minimum length of the spring is 400
an energetic proton is fired at a stationary proton for the reaction to produce new particles the two protons must
suppose a neutrino is created and has an energy ofnbsp500 mevnbspanbspassuming the neutrino like the photon has no mass
a windmill that was rotating at 21 rads begins to slow down with a constant acceleration of 045 rads2a how long does it
the power in watts used to move air out of the lungs is equal to the air pressure in nm2 multiplied by the air flow
suppose a 60-w light bulb is left on over a long weekend say for 72 hours if the electric company charges you 008kwh
1 imagine that you heard someone announce each of the following discoveries knowing what you know about the solar
a 139 x 10-6 f capacitor is connected to an ac generator with an rms voltage of 394 v and a frequency of 86 hz what is
a ball is thrown straight up with an initial velocity of 52ms how long did it take to reach maximum height and what is
please explain the answers1a basketball player makes a free-throw shot at the basketnbspthe 06 kg basketball leaves the
a great lakes ore freighter has a mass of 41000 tons it is designed to safely carry 31000 tons of iron ore when it is
a thin solid barrier in the xy-plane has a 142mumnbspdiameter circular hole an electron traveling in the z-direction
a string hangs over a frictionless pulley a 10 kg mass hangs on one side of the pulley and a 25 kg mass hangs on the
1a 500 g piece of silver at 150oc is submerged in 1000 g of water at 5oc to be coolednbspdetermine the final
1what is the maximum distance that a 60 w motor may vertically lift a 90 n weight in 75 s2 a force of 25 n is required
a 0300-kg sample of nitrogen gas diatomic molecules mn2 4652 times 10-26 kg in a chamber fitted with a piston
brett uses a rope and pulley to lift a 75 kg sack 20 m onto a truck he pulls downward on the rope with a force of 25 x
a a 2500 n force moves a 1200 kg crate from rest to a final speed of 96 msnbspif the frictional force is 500 n what is
a copper cup with a mass of 1000 g contains 960 g of water both the cup and the water are at 130oc if 700 g of a
describenbspspecific heatnbspwater has a specific heat of 10 calgoc while that of copper is 009 calgocnbspwhat can you