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One cubic meter of water flowing over Niagara Falls in New York drops 92.2 meters. If all the energy of the water is converted to heat, how much heat energy would the water have?
An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is = 1.42 × 109 W/m2. find the magnetic field in the electromagnetic wave emitted by the lase
a 1.2-m-long steel rod with a diameter of 0.50 cm hangs vertically from the ceiling. By how much does the rod stretch
Explain how fast would it be moving after it had fallen a distance of 0.010 m? (Assume that the gravitational force is constant over the distance of the fall, and that the star is not rotating.)
Water at 20.0 °C is sprayed onto 0.236 kg of molten gold at 1063 °C (its melting point). What is the minimum mass of water that must be used
A 73 trampoline artist jumps vertically upward from the top of a platform with a speed of 4.0. If the trampoline behaves like a spring of spring constant 6.2×104, how far does he depress it.
An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. How far (in km) must he now travel to reach base camp
In a hydraulic lift, the maximum gauge pressure is 15.3 atm. what is the heaviest vehicle that can be lifted
An electron and a proton are each placed at rest in a uniform electric field of magnitude 564 N/C. Calculate the speed of each particle 44.4 ns after being released.
Compute the force of gravity between a newborn baby (mass = 4 kg) and the planet Mars (mass = 6.4 x10^23 kg), when Mars is at its position closest to Earth (distance = 8.0 x10^10 m).
A centrifuge in a medical laboratory rotates at an angular speed of 3800 rev/min. Find the constant angular acceleration of the centrifuge
The drive shaft AB of an automobile is to be designed as a thin-walled tube. The engine delivers 125 kW when the shaft is turning at 1500 rev/min. Determine the minimum thickness of the shaft's wall
The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. The mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain by the block and tackle pulley system. What is the work done..
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