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On a cold winter's morning a child sits on a sled resting on smooth ice. When the 9.75-kg sled is pulled with a horizontal force of 44.0 N it begins to move with an acceleration of 2.98 m/s2. The 23.0-kg child accelerates too, but with a smaller acceleration than that of the sled. Thus, the child moves forward relative to the ice, but slides backward relative to the sled. Find the acceleration of the child relative to the ice.
A pitcher throws a baseball vertically upward with an initial speed of 15.0 m/s, releasing the ball when it is 2.00 above the ground, How long is the ball in the air
particle a of charge 4.00 10-4 c is at the origin particle b of charge -5.00 10-4 c is at 7.00 m 0 and particle c of
A Fabri-Perot interferometer is to be used to resolve the mode structure of a He-Ne laser operating at 632.8 nm. What is the coefficient of finesse of the instrument
Suppose an astronaut has landed on Mars. Fully equipped, the astronaut has a mass of 128 kg, and when the astronaut gets on a scale, the reading is 483 N. What is the acceleration due to gravity on Mars
It has been said that George Washington, in his youth, threw a silver dollar across a river. Assuming that the river was 300 meters wide, How long was the coin in flight
A bullet of mass 7.00g is fired horizontally into a wooden block of mass 1.21kg resting on a horizontal surface. compute the initial speed of the bullet
A bullet of massm = 15 g and velocity 260 m/s is shot into a block of wood that is firmly attached to the ground. What was the acceleration of the bullet
A person on a trampoline bounces straight upward with aninitial speed of 4.5 m/s. What is the persons speed when she returnsto her initial height
A circus clown weighs 900 N. The coefficient of static friction between the clown's feet and the ground is 0.4. What is the minimum pulling force that the clown must exert to yank his feet out from under himself
A typical laboratory centrifuge rotates at 4000 rpm. Test tubes have to be placed into a centrifuge very carefully because of the very large accelerations. What is the acceleration at the end of a test tube that is 10 cm from the axis of rotation
Calculate the electric field intensity at a distance of 14 cm from the center of the shell
Ilya and Anya each can run at a speed of 8.70 \rm{mph} and walk at a speed of 3.60 \rm{mph}. How long does it take Ilya to cover the distance
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