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A 30.0-N stone is dropped from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it falls?
A merry-go-round starts from rest and accelerates uniformly over 11.0 s to a final angular velocity of 7.50 rev/min, Find the angular acceleration of the merry-go-round
You push on the chair with a force of = 42.0 directed at an angle of 34.0 below the horizontal and the chair slides along the floorcalculate, Illustrate what is the magnitude of the normal force that the floor exerts on the chair.
Two circus performers, Jack and Jill, whose total mass is 120 kg, start a swing which is 5 m long such that initially the rope attached to their swing makes an angle of 36 degrees with the horizontal.
Light of wavelength 560 nm illuminates a single 0.77 mm wide slit. At what distance from the slit should a screen be placed, What is the width of the central maximum
A heavy crate is attached to the wall by a light rope. Another rope hangs off the opposite edge of the box. If you slowly increase the force on the free rope by pulling on it in a horizontal direction, which rope will break? Ignore friction and th..
A 0.873-kg block is held up against a ceiling by a pole that makes an angle of 21 degree with respect to the vertical; What minimum force in the pole is necessary to get the block moving
The leg and cast weigh 220 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 135 N. find the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast.
Two sources have sound levels of 104dB and 62.3 dB. what is their combined intensity
The spring constant for the tendon is the same for both groups, 32 {rm {N}/{mm}} . What is the difference in maximum stored energy between sprinters and nonathletes.
Four vectors A,B,C ,D and are shown (not to scale). Vector A has magnitude 23.0 and acts at an angle of 14.7 degrees with respect to the positive x axis. find the magnitude and direction of the resultant vector R
When blue light of wavelength 440 nm falls on a single slit, the first dark bands on either side of center are separated by 49.0 degrees. Determine the width of the slit
An electon is accelerated through 25000 V. how much energy and what frequency will one photon have
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