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Consider a ball with mass m = 50 kg. The ball is at rest on a cliff 328 feet above the ground. (A) Derive an equation that describes the potential energy of the ball as a function of time after it falls off the cliff. (B) How much kinetic energy (in Joules) does the ball have 2.1 seconds after it falls?
A bullet is fired through a board 13.5 cm thick, with a line of motion perpendicular to the face of the board. what is its acceleration as it passes through the board
A dry cell when short-circuited will furnish about 30 amp for a brief time. If its emf is 1.5 v, calculate what is its internal resistance
How does this compare with a gigawatt coal fed power plant or a gigawatt nuclear power plant?
Production costs are in millions of dollars, and promotions in hundreds of thousands of dollars; S denotes success and F failure.
Find the radical acceleration at the edge of a phonograph record of radius 0.15 m rotating at 78 rev min^-1. B.) The record comes to a stop with a uniform angular acceleration in 2 s. Find the tangential acceleration at the edge and the angular accel..
What is the average velocity for the round trip
Find what is the maximum frictional force in the knee joint of a person who supports 66 kilogram of her mass on that knee
A window washer pushes his scrub brush up a vertical window at constant speed by applying a force as shown in the figure below.The brush weighs 12.7 N, θ =54.5° and the coefficient of kinetic friction isμk = 0.154.
A large tank is divided into two parts by a partition. The first part contains 5 kg of refrigrtant-134a at 80oC, 900 kPa. The other part contains 3 kg of refrigerant-134a at -2oC with a vapor mass fraction of 46 percent.
A 2.1 kilogram mass is connected to a spring with spring constant k = 150N/m and unscratched length 18 centimeter. Evaluate what the radius of its path
A ring of charge of radius R meters has a constant charge density -lambda distributed uniformly along its length. Find the expression for |E| near the center of the ring
An astronaut is tethered by a strong cable to a spacecraft. The astronaut and her spacesuit have a total mass of 100kg, while the mass of the cable is negligible. What force does the cable exert on the astronaut
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