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A 7 kg penguin is sliding on his belly down a 23 degree icy slope. What is the magnitude of the normal force. Determine magnitude and direction of the parallel acceleration.
A 0.565-kg ball has an elastic, head-on collision with a second ball that is initially at rest. What is the mass of the second ball
A meterstick (L = 1 m) has a mass of m = 0.217 kg. Initially it hangs from two short strings: one at the 25 cm mark and one at the 75 cm mark. Where is the angular acceleration of the meterstick a maximum
One gallon of gasoline contains 3.1x10^7 calories of potential energy that are released during combustion. what is the average force produced by the gasoline
The primary window of an electric train transformer has 400 turns, and the secondary has 50. If the input voltage is 120 V, what is the current in the secondary
The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.50 m and 0.98 m, respectively. Calculate the speeds of the tips of both rotors
The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. In this process a filament (a piece of metal in a vacuum) is heated by the application of electrical current
A 1 kg wheel (hoop) rolls 5 rev. across a horizontal surface (without slipping)a distance of 3.2 m. if the wheel rolls for 3 sec. determine the angular velocity of the wheel
A tube with a 5.0 mm radius has ions flowing through it. To determine the rate at which the charge is being moved through the tube, find the magnitude of the current flowing through the tube
Sunlight shines directly on to the wall of a large soap bubble (n = 1.33) which is floating in air (n=1). What is the minimum thickness it could have to produce completely destructive interference for blue light (%u03BB = 475 nm)
Suppose you are riding a stationary exercise bicycle, and the electronic meter indicates that the wheel is rotating at 9.1 rad/s, For how many minutes have you been riding your bike
Picture a uniform disk with a circular hole cut out of it. The disk has a radius of 4.00 m. What is the x-coordinate of the center of gravity of the system
A transformer has 5.00 E4 turns in its primary coil and 7.00 E3 turns in its secondary coil. find the rms current in the primary coil
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