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a 685-kg elevator starts from rest and moves upward for 270 s by constant acceleration until it reaches its cruising
two point-source loudspeakers are a certain distance apart and a person stands 120 m in front of one of them on a line
how fast in kilometres per hour should a sound source be moving toward you to make the observed frequency 50 greater
while running a person dissipates about 060 j of mechanical energy per step per kilogram of body mass if a 56 kg person
when an automobile moves by constant speed down a highway most of the power developed by the engine is utilized to
a skater embeds a firecracker in large snowball and pushes it across a frozen pond at 76 ms the firecracker explodes
a cylindrical satellite is 14m in diameter with its mass of 940 kg distributed approximately uniformly throughout its
a particular radioactive source produces 150 m rads of 25 mev gamma rays per hour at a distance of 1 m1 how long could
a soft foam pit is used for landing during the pole vault the foam pit cushions the landing of the vaulted by1 reducing
the near point of an eye is 109 cm a corrective lens is to be utilized to allow this eye to clearly focus on objects
two children seat themselves on a seesaw the one on the left has a weight of 360 n while the one on the right weighs
two weights are hung on either side of the pivot support of a meter sticknbsp ignore the weight of the meter stick and
the torque needed to loosen a bolt has a magnitude of 5nm what is the or that should b applied to the end of a 14cm
a stream of gas molecules by a mass of m is incident on a wall the collisions are elastic and the velocity of the
a piece of aluminum has density 270gcmnbsp 3 and mass775 g the aluminum is submerged in a container of oil of density
a 200 lb man jumps out of a window into a fire net 30 ft below the net stretches 6 ft vertically before bring in the
at one instant force 582 n acts on a 0973 kg object that has position vector 304-304 m and velocity vector -902 902ms
two resistors a and b are connected in parallel across a 60 v battery the current during b is found to be 20 a when the
a the moons force is what percent of the suns forceb what is the gravitational force of the sun on the earthc what is
a 400g piece of metal is dropped into a cup containing 450g of water at 15c the final temperature of the system is 40c
a solid concrete wall 40 m x 24 m x 30 cm thick has a thermal conductivity of 13 wmk and separates a basement at 18c
the standard kilogram is a platinum-iridium cylinder 39 mm in height and 390 mm in diameter what is the density of the
a uniform aluminium rod in the shape of a long cylinder of initial length of 4 meters and a radius of 001 m is clamped
a spaceship of triangular shape having a length twice its width is capable f relativistic speeds how fast would it have