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The average flux of primary cosmic rays over earth's surface is approximately 1 cm-2 s-1 and their average kinetic energy is 3 GeV. Calculate the power delivered to the earth from cosmic rays in giga watts. (Earth's radius = 6,400 km)
A bolt comes loose from underneath an elevator that is moving upward at a speed of 5.9 m/s. The bolt reaches the bottom of the elevator shaft in 2.5 s. How high up was the elevator when the bolt came loose
Imagine your car is powered by a fusion engine in which the following reaction occurs: 31H2 ---->2He4 + 1H1 + 0n1 The atomic masses are 1H2 ( 2.0141 u), 2He4 (4.0026 u), 1H1 (1.0078 u), and 0n1 (1.0087 u). The engine uses 4.28 x 10-6 kg of deuterium ..
A centrifuge is rotating at 10,000 revolutions/minute. It is brought to rest in 4.00 seconds under a constant acceleration. Determine the initial angular velocity of the centrifuge in rad/sec
The yellow light from a helium discharge tube has a wavelength of 587.5 nm. Calculate the number of lines per centimeter on the grating
define the initial velocity of the ball.
A solid cylinder of mass 10kg and radius 20cm is free to rotate around an axis parallel to the axis of the cylinder. What is the kinetic energy of the cylinder
A piece of copper wire has a resistance per unit length of 6.45 10-3 ?/m, Find the magnetic field strength at the center of the coil
A turn-table is spinning down due to friction in the bearings. It takes 60 seconds for the turn-table to stop from an initial speed of 2. 5 s?1 and that the magnitude of the initial angular acceleration was 0.10s?2. compute the number of rotations ..
A weightless spring of force constant 2.50 N/cm is 15.0 cm long when nothing is attached to it. It is now utilized to pull horizontally on a 12.5 kg box on a smooth horizontal floor. You observe that the box starts from rest and moves 96.0 cm through..
As a hiker in Glacier National Park, you are looking for a way to keep the bears from getting at your supply of food. What will be the acceleration of the bags when you let go of the anchor bag
A 61.0kg skater moving initially at 3.78m/s on rough horizontal ice comes to rest uniformly in 3.24s due to friction from the ice
on a warm 30 degree celcius spring day you are watching richard take a buzzer and twirl it horizontally around on the end of a 2.0 meter long string. what is the angular speed
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