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Catapult fires an 800-kg rock with an initial velocity of 100 m/sat a 40° angle from ground. What is the magnitude of the horizontal impulse the catapult receives from the rock?
A 100g ball on a 50 cm long string is swung in a vertical circle about a point 200 cm above the floor. obtain the tension in the string an instant before it broke
Consider an object on an incline where friction is present. The angle between the incline and the horizontal is ? and the coefficient of kinetic friction is ?k. Find an expression for the acceleration of this object
A piece of Nichrome wire has a radius of 7.2 x 10-4 m. It is used in a laboratory to make a heater that dissipates 3.30×102 W of power, estimate the necessary length of wire
A 1600 kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16430 N on the sub, with a downward resistive force of 1000 N. What is the submarine's acceleration.
A rope is with each end is attached to a ceiling that is 8ft long. The ends are positioned 6ft apart. What is the tension in the section of rope that three foot long
A 4.70 kg object on a horizontal frictionless surface is attached to a spring with spring constant 920 N/m. obtain the initial potential energy of the block-spring system
A closed Gaussian surface in the shape of a cube of edge length 2.50 m. It lies in a region where the nonuniform electric field is given by = (3.35x + 4.36) + 6.10 + 7.19N/C
An ideal gas is confined to a cylinder by a piston. The piston is slowly pushed so that the gas temperature remains at 20 degrees C. find the entropy change of the gas
A star lying 35pc from the Sun has proper motion of 0.2"/yr. calculate the magnitude of its three-dimensional velocity relative to the Sun
The nucleus of a hydrogen atom is a single proton. The radius of a proton is approximately 1 fm. What fraction of a hydrogen atom is occupied by the nucleus
When the dried-up seed pod of a scotch broom plant bursts open, it shoots out a seed with an initial velocity of 2.64 at an angle of 62.0 above the horizontal
question prove that the formula for the sum of the measures of the interior angles of a n-gon is 180n-2 or 180-360
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