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an empty 13461 kg coal car is coasting on a level track at 67 ms suddenly 4761 kg of coal is dumped into it from a
suppose the loop in the generator in the figure below is square and the length of each side of the loop is increased by
typically a tennis ball hit during a serve travels away at about 47 ms if the ball is at rest in mid-air when struck
a 40kg child slides down a frictionless playground slide starting from rest at a height of 22 m he leaves the bottom of
an artillery shell of mass 1000 kg lying at rest on the ground accidentally detonates exploding into three pieces of
two loudspeakers in a plane 60 apart are playing the same frequency if you stand 140 in front of the plane of the
the electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 120
a microscope has an objective lens of focal length 540 mm the objective forms an image 159 cm from the lens the focal
a simple pendulum has a period of 25 sa what is its period if its length is made four times largerb what is its period
between each pair of vertebrae in the spinal column is a cylindrical disc of cartilage typically this disc has a radius
a sailboat is heading directly north at a speed of 18 knots 1 knot 0514 ms the wind is blowing towards the east with a
a fireman d 460 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of
a cue stick hits a cue ball with an average force of 24 n for a duration of 0028 s if the mass of the ball is 016 kg
a ball has a diameter of 389 cm and average density of 00844 gcm3 what force is required to hold it completely
a uniform bridge span weighs 500x103 n and is 40mlong a car weighing 150 x103 n is parked withits center of gravity
the maximum intensity per unit wavelength of an ideal blackbody occurs at the same wavelength as the electromagnetic
a converging lens with a focal length of 129 cm and a diverging lens are placed 255 cm apart with the converging lens
the femur is a bone in the leg whose minimum cross-sectional area is about 43 x 10-4 m2 a compressional force in excess
a laser beam is traveling through an unknown substance when it encounters a boundary with air the angle of reflection
a base on planet x fires a missile toward an oncoming space fighter the missiles speed according to the base is 087 c
suppose 126 g of oxygen gas o2 320 gmol is heated at constant atmospheric pressure from 170degc to 110degca how many
suppose 0001 m3 of a monatomic gas initially at 284 k and 11 atm is suddenly compressed adiabatically to half its
suppose that at the top of its parabolic trajectory a projectile has a horizontal speed uox the segment at the top of
a particular heat engine has a useful power output of 440 kw and an efficiency of 300 the engine expels 7200 j of
a point mass m starts from rest and slides down the surface of a frictionless solid sphere of radius r find the angle