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A star in a distant galaxy is located at a distance of 20 kpc from the center of that galaxy. It is observed to move around that center at a speed of 230 km/s. Based on its measured luminosity, the luminous mass of this galaxy is estimated at 3.5 X 1010 Msolar.
What is the total mass of the dark matter in this galaxy?
A 12.0-kg cylinder rolls without slipping on a rough surface. At an instant when its center of gravity has a speed of 12.2 m/s, determine the rotational kinetic energy about its center of gravity
What was the initial speed of the arrow. A block with mass m = 19.7 kg slides down an inclined plane of slope angle 35.8 deg with a constant velocity. It is then projected up the similar plane with an initial speed 1.05 m/s. How far up the incline w..
What is the height of the hill . Find the coefficient of kinetic friction between flight bag and floor.
A rifle with a barrel length of 57 fires an 11 bullet with a horizontal speed of 440. The bullet strikes a block of wood and penetrates to a depth of 12. What resistive force (assumed to be constant) does the wood exert on bullet.
An object is placed 2.0 cm from a converging lens with focal length 1.5 cm. Determine the location of the final image
Two small nonconducting spheres have a total charge of 93.1 C. When placed 1.01 m apart, the force each exerts on the other is 11.5 N. What is the charge on each? What if the force was attractive?
A motorcycle and a police car are moving toward one another. The police car emits sound with a frequency of 532 and has a speed of 25.5. The motorcycle has a speed of 12.50. What frequency does the motorcyclist hear in this case?
What's the result when we grow up InGaN on the substrat by MBE I want a (pdf) discruption or I want to talk to any one who knew that's result.
Describe the interference of two wave pulses with different amplitudes if they are a) in phase and b) completely out of phase
A 2.5-kg block is attached to a spring with k=100 N/m and compress it with a distance of 0.40 m. What is the mechanical energy of the block
A projectile is fired at an upward angle of 45 degrees from the top of a 265 m cliff with a speed of 350 m/s. Illustrate what will be it's speed when it strikes the ground below?
An Oscilloscope grid is calibrated so that one square represents 1-V vertically and 1 msec horizontally. If the height of a square wave pulse display is 6 squares, the width of the pulse is 7 squares, and the cycle of the wave is 16 squares, the a..
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