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When an 81.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 1.60 x 103 J. By how much does the potential energy of a(n) 20.5-kg child increase when the child climbs a normal staircase to the second floor?
A father pulls his children in a wagon for 25 minutes covering 1.25 miles on a level sidewalk. What is the average horsepower required
a block starts at rest and slides down a frictionless track. the acceleration of gravity is 9.81 ms2. it leaves the
Ship A is located 4.0 km north and 2.5 km east of ship B. Ship A has a velocity of 22 km/h toward the south, what is the least separation
A spring with spring constant 15N/m hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. What is its the mass of the ball
A 1,800-kg pile driver is used to drive a steel I-beam into the ground. calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest
A toy car runs off a table and lands 3 metersaway from the edge of the table. If the table is 0.8 metershigh, Calculate the time of flight of the toy car
A model rocket is fired vertically from rest. It has a net acceleration of 16.5 m/s2. After 1.1 s, its fuel is exhausted and its only acceleration is that due to gravity. how high does the rocket travel
In a certain binary-star system, each star has the a mass of 1.00 multiply.gif 10^30 kg, What is their period of revolution in Earth years
a tennis player standing 12.6 m from the net hits the ball at 3.27deg above the horizontal. to clear the net the ball
A 210-kg load is hung on a wire of length of 4.80 m, cross-sectional area 2.00 10-5 m2, and Young's modulus 8.00 1010 N/m2. What is its increase in length
question1the pulley of an ideal atwoods machine is given an upward acceleration a. find out an acceleration of each
A uniform magnetic field of magnitude 0.80 T is directed perpendicular to the plane of a rectangular loop, calculate the magnetic flux through the loop
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