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A 47.3-kg skater is standing at rest in front of a wall. Bypushing against the wall she propels herself backward with avelocity of -2.41 m/s. Her hands are in contact with the wall for1.19 s. Ignore friction and wind resistance. Find the average force she exerts on the wall (which has the same magnitude, but opposite direction, as the force that the wall applies to her). Note that this force has direction, which you should indicate with the signof your answer.
A 0.800kg block is attached to a spring with spring constant 15N/m . While the block is sitting at rest, What is the amplitude of the subsequent oscillations
A boat heads directly across a river. Its speed relative to the water is 3 m/s. How fast is the boat going relative to the bank of the river
Two isotopes of carbon, carbon-12 and carbon-13, have masses of 19.93 × 10-27 kg and 21.59 × 10-27 kg, respectively. Determine the spatial separation between the two isotopes
A 170 g ball attached to a spring with spring constant 2.1 N/m oscillates horizontally on a frictionless table. Its velocity is 22 cm/s when xo= 4.3 cm. What is the ball's position when the acceleration is maximum
The masses of the earth and moon are 5.98*1024 and 7.35*1022 kg, respectively. Identical amounts ofcharge are placed on each body, such that the net force(gravitational plus electrical) on each is zero. What is the magnitude of the charge placed on..
A particle with a charge of ?1.0 ?C and a mass of 2.4 10-6 kg is released from rest at point A and accelerates toward point B, What is the potential difference VB ? VA between A and B
A wire of thickness d = 5 mm is tightly wound 200 times around a cylindrical core to form a solenoid. What is the the magnetic field on the axis of the solenoid
Find the weight of the hanging mass when the spring, with spring constant 15.5 kN/m , has been stretched 15.1cm
The rope wrapped around the outer diameter of the disk is pulled at a constant speed of 1.06 m/s. If the outer radius is 1.39 cm, how fast does the hanging mass rise
If John Glenn weighed 640 N on the Earth's surface, i) how much would be having weighed if his Mercury spacecraft had (hypothetically) remained at twice the distance from the center of the earth? ii) Why is it said that an astronaut is never truly..
A parallel-plate capacitor with circular plates of radius 80 mm is being discharged by a current of 7.0 A. At what radius (a) inside and (b) outside the capacitor gap is the magnitude of the induced magnetic field equal to 70% of its maximum value? (..
A boy uses a slingshot to launch a pebble straight up into the air. The pebble reaches a height of 24.0 m above the launch point 2.3 seconds later, What was the pebble's initial speed
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