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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
the solubility of caffeine in water in 22mgml at 25c and 670 mgml at 100c how many ml of boiling water would it take to
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
at room temperature benzoic acid dissolves in the less polar solvent ether but not very much in the more polar solvent
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
you are hard at work separating diethyl ether and toluene by simple distillation your lab partner unfortunately spills
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
you have a mixture of solids in the ratio of 503 for a b you are planning to use the technique of recrystallization to
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