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a rocket with an initial mass of 1000kg adjusts its thrust by varying the rate at which mass is ejected the ejection
a 30 kg mass sliding on a frictionless surface explodes into three 10 kg massesnbsp after the explosion the velocities
a neutron star has a mass of 220 x 1030 kg about the mass of our sun and a radius of 50 x 103 m about the height of a
a what is the escape speed on a spherical asteroid whose radius is 585 km and whose gravitational acceleration at the
a 004 kg bullet is moving horizontally with a velocity of 355 ms where the sign indicates that is moving to the right
1 decide the amount of work in joules that should be done on a100 kg payload to elevate it to a height of 997 km above
one mole of oxygen gas is at a pressure of 530 at m and a temperature of 310degca if the gas is heated at constant
a grandfather clock is controlled by a swinging brass pendulum that is 10 m long at a temperature of 22degcnbspa what
a spacecraft in the shape of a long cylinder has a length of 100 m and its mass with occupants is 1260 kg it has
a 65-kg bicyclist rides his 88-kg bicycle with a speed of 14 msa what is the magnitude of the braking forceb how far
a ball is tossed from an upper-story window of a building the ball is given an initial velocity of 880ms at an angle of
a fireman 440 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of
a 200-g block is pressed against a spring of force constant knm until the block compresses the spring 100cm the spring
a 5000kg mass starts from rest and slides down on an inclined plane hits a bumper at the bottom of the inclined plane
a helicopter starting from rest accelerates straight up from the roof of a hospital the lifting force does work in
a police officer in hot pursuit drives her car during a circular turn of radius 300m with a constant speed of 800kmh
pushing on the pump of a soap dispenser compresses a small spring when the spring is compressed 050cm its potential
astronomers observe a 600 106 hz source both directly and by reflection from the sea the receiving dish is 200m above
a microphone is attached to a spring that is suspended from the ceiling directly below on the floor is a stationary 440
an astronaut is connected to her spacecraft by a 25-m-long tether cord as she and the spacecraft orbit earth in a
a simple pendulum is made from a string that is 065m in length with a mass of 02kg attached to the free end the mass is
a fish swimming in a horizontal plane has velocity 400i 100j ms at a point in the ocean where the position relative to
the inner edge of a race track is in the form of a rectangle with two semicircular ends on the shorter sides the
a member of an aircraft maintenance crew wears protective earplugs that decrease the sound intensity by a factor of 390
the human brain consumes about 22 w of power under normal conditions though more power may be needed during examsa how