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A 28 kilogram child initially at rest slides down a playground slide from a height of 3.0 meter above the bottom of the slide. If her speed at the bottom is 2.5 m/s, calculate the work done by non-conservative forces?
The world consumes energy at the rate of about 456 per year, where the joule is the SI energy unit. estimate the average per capita energy consumption rate in watts
A simple pendulum is 9.00 m long. What is its period if the elevator is accelerating downward at9.00 m/s2
An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 690 K. If the initial pressure is 1.10 105 Pa. Find the change in the internal energy
it is possible to generate electricity using small variations in the earths magnetic field but why havent we done it?
a heat engine operates between a hih temp reservoir at 610K and low temp reservoir at 320K. find the net change in entropy as a result of this cycle
A surface encloses the charges q1= 3.2 µC, q2 = 6.9 µC, and q3 = -4.1 µC. Find the electric flux through the surface
A Carnot engine is operated between two heat reservoirs at temperatures of 530K and 300K. What is the thermal efficiency of the engine
A 2kg block initially hangs at rest at the end of two long strings of negligible mass as shown in the diagram below. a 150 g bullet, moving horizontally with some speed, strikes the block and appears from other side at speed of 350 m/s. after the ..
what is the magnitude of the electrostatic force between a singly charged sodium ion na of charge e and an adjacent
An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of 7.69 rev/s, Which rate of rotation gives the greater speed for the ball
A toy balloon is filled with helium gas He at 1 atm and 28 degree C If the volume of the balloon is 0.024m^3 , how many atoms does it contain
A black hole is roughly defined as a an object dense enough that the speed needed for launching things from its surface must be the speed of light or greater. 3.00x108m/s. Determine the maximum radius of the earth
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