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Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 .
A sprinter of mass 66.2 starts his race by pushing horizontally backward on the starting blocks with a force of 190 Determine his initial acceleration as he leaves the blocks.
A 1.65 kg bowling trophy is held at arm's length, a distance of 0.68 m from the shoulder joint. What is the magnitude of the torque applied by the trophy
A 139 x 139 timber is used as a short foundation post. It must support a load of 42 kN. Determine the average axial stress in the post
Short pulses of laser light traveling in the x-direction with a diameter of 1 mm are incident on a perfect mirror. The pulses are 10^-13 seconds long and have a repetition rate of 10 Hz, each with an energy of 1 mJ.
A uniform solid disk of radius 1.60 m and mass 2.30 kg rolls without slipping to the bottom of an inclined plane. what is the height of the inclined plane
The weight of an object is the product of its mass, , and the acceleration of gravity, (where ). If an object's mass is , what is its weight
Suppose that when you ride on your 7.60kg bike the weight of you and the bike is supported equally by the two tires. What is your weight
Find the center of mass of a system composed of three spherical objects with masses of 3.4kg , 2.3kg , and 4.2kg and centers located at (-6.2m , 0), (2.0m , 0), and (2.8m , 0), respectively.
A car uniformly decelerates at a rate of -5.00 m/s^2. How far does the car travel after 1.5 seconds if it initially was moving at a speed of 25 m/s
A 0.495-kg mass is attached to a horizontal spring with k = 105 N/m. The mass slides across a frictionless surface. Find the mechanical energy of the system
The Lunar Lander of mass 1.9Ã?104kg made the last 150m of its trip to the Moon's surface in 120s, determine the upword force required to decend at a constant speed
Two point charges 1.9cm apart have an electric potential energy -150?J . The total charge is 30nC
A girl of mass 50.0 kg jumps off the bow of a 84.0-kg canoe that is initially at rest. If her velocity is 2.90 m/s to the right, what is the speed of the canoe after she jumps
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