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a parachute dropped from a 30 meter-high cliff falls with a constant velocity of 15 meters per second twenty-two
a board lies on top of 2 uniform cylinders that lie on a fixed plane inclined at an angle theta the board has mass m
a small piece of dust of mass m 16 g travels horizontally through an electric air cleaner in which the electric field
a hockey player is standing on his skates on a frozen pond when an opposing player moving with a uniform speed of 40 ms
johnny thunder is swinging a watch from a 200 cm chain what is the period of swing from the
a girl walks 26 meters at an angle of 39deg west of southhow far west of her starting point is shehow far south of her
a plane heads due north while a crosswind blows west the planes resultant velocity is 620 kmh 22deg west of northwhat
1 a river flows at a speed of 12ms from north to south a powerboat can move at a constant maximum speed of 23 ms in
two 20-g pith balls hang in air on essentially weightless cotton threads 50-cm long from a common point of support the
you kick a 23 kilogram football straight into the air with a force of 50 newtons if your foot traveled 150 centimeters
if a 034kg kickball is rolled towards a kicker at 81ms and then is kicked at its velocity of -120ms what impulse is
each second a nuclear power plant generates 2000 mj of thermal energy from nuclear reactions in the reactors core this
45 j of work are done per cycle on a refrigerator with a coefficient of performance of 50a how much heat is extracted
a street lamp weighs 180 n it is supported by two wires that form an angle of 140deg with each other the tensions in
a 100kg black m us on a frictionless plane inclined at 20 degrees the block is attached to a spring k 25nm that is
a person weighs 836 n in air and has a body fat percentage of 205a what is the overall density of this persons
the efficiency of a carnot engine is 29 the engine absorbs 815 j of energy per cycle by heat from a hot reservoir at
when 195 g of a substance is heated to 335degc and then plunged into a 100 g aluminum calorimeter cup containing 134 g
a girl who is learning karate is going to break four bricks with her hand her hand and arm mass is 156 kg each brick
a 21 kg chimpanzee hangs from the end of a horizontal broken branch of length l0 16 m as shown in the figure the
a speedboat moving at 380 ms approaches a no-wake buoy marker 100 m ahead the pilot slows the boat with a constant
a boat with an engine speed of 12 ms directs its motion straight east across a river that is flowing south at 3 ms what
a 500 stunt pilot who has been diving her airplane vertically pulls out of the dive by changing her course to a circle
a student tries to raise a chain consisting of three identical links each link has a mass of 0360 kg the three-piece
robin hood aims a 500 g arrow at a 2 kg bird perched on a tree the arrow is released with a speed of 40 ms at an angle