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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 2.25x10^3 J. By how much does the potential energy of a(n) 18.5-kg child increase when the child climbs a normal staircase to the second floor?
in the electron gun pictured a potential difference of 12.0 kv is found to bring electrons from rest at the cathode to
An electron with kinetic energy 1.36 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 24.0 cm. Find the frequency of circling
An x-ray tube is operated at 45000 V. Find the minimum wavelength of the radiation emitted by this tube
A bungee jumper with mass 52.0 kg reaches a speed of 13.5 m/s moving straight down when the elastic cord tied to her feet starts pulling her back up. find the average force that the bungee cord exerts on the jumper
Starting from rest, a 91-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 800 N, How far did he slide down the pole
A -6.0 diopter lens is held 10.0 cm from an ant that is 1.0mm high. What is the height of the image
Three moles of an ideal monatomic gas expands at a constant pressure of 2.00atm ; the volume of the gas changes from 3.40×10?2m3 to 4.60×10?2m3. Calculate the amount of work the gas does in expanding
A man pushes a 16kg block from rest to speed v doing 1200 j of work in the process, during this time, find the horizontal force exerted on the block
a concrete block with a specific weight of 23.6 knm3 is suspended by a rope in a solution with a specific gravity of
For the Atwood's machine, suppose the masses have an initial speed of v = 0.22 m/s and that m2 is moving upward. How high does m2 rise above its initial position before momentarily coming to rest, given that m1 = 3.5 kg and m2 = 3.1 kg.
What was the spring constant of the Super Bungee? How much time after the Super Bungee was attached did it take the bus to stop.
The membrane that surrounds a certain type of living cell has a surface area of 4.5 x 10-9 m2 and a thickness of 1.1 x 10-8 m, how many such ions are present on the outer surface
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