Calculate the force of gravity between a human child
Calculate the force of gravity between a human child (mass = 28 kg) and the planet Mars (mass = 6.4 1023 kg), when Mars is at its closest to Earth (distance = 8. 1010 m).
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Describe viscosity and surface tension in terms of intermolecular forces. Under which conditions (stronger or weaker IMF) will viscosity and surface tension increase?
An explosion breaks an object into two pieces, one of which has 1.8 times the mass of the other. If 10000 J were released in the explosion, how much kinetic energy did each piece acquire?
The gas is heated to 363 K and some is allowed to escape from the can so that the remaining gas reaches atmospheric pressure. The cap is now tightened, and the gas is cooled to 298 K. What is the pressure of the cooled gas? show work.
A 500 g ball moves in a vertical circle on a 50 cm-long string. When the string is horizontal the speed of the ball is 8 m/s. What is the speed of the ball at the highest point?
An echo is heard in 3 sec after the emission of sound. If speed of sound in air is 342 m/s, what is the distance of the reflecting surface from the source?
A 58 kg woman stands on a very light, rigid board that rests on a bathroom scale at each end. What is the reading on each of the scales?
A radio-controlled car increases its kinetic energy from 4 J to 12 J over a distance of 2 m. What was the average net force on the car during this interval?
How much work is done by the force of friction as the block moves through the rough area? At what height h above the ground is the block released? How much work is done by the gravity force through the entire process?
If the magnitude of the instantaneous velocity at t1 is v1 = 3 m/s, what is the instantaneous velocity v2 at time t2?
A transformer has 200 turns on its primary and 12 turns on its secondary. If the input voltage is 2000 V, What is the output voltage?
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