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A man pushes a lawn mower on a level lawn with a force of 208N. If 42% of this force is directed downward, and 54 W of power is expended in pushing the mower 4.7 m, how much time is spent in pushing the mower this distance?------s
A photon with energy E collides with a stationary mass m. What is the mass and speed of this particle
In a region where there is an electric field, the electric forces do +8.00x 10^-19 J of work on an electron as it moves from point X to point Y.What is the potential difference, VY - VX, between point Y and point X?
A golf ball is hit horizontally from the edge of a ramp. It lands at an elevation 200 m below and its trajectory upon landing is 45° angle below the horizontal
In an aluminum pot, 0.15 kg of water at 100 degrees c boils away in four minutes. find the temperature at the aluminum-steel interface
A small ball is attached to one end of a spring that has an unstrained length of 0.214 m. The spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 2.73 m/s. The spring remains nearly parallel to the gro..
An insulated Thermos contains 152 cm3 of hot coffee at 90 °C. You put a 12.0 g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached?
A Styrofoam box has a surface area of 0.79 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, determine the thermal conductivity of the Styrofoam
A boy whirls a stone using an r-m long string in a horizontal circle h m above the ground. The string broke, and the stone flies off horizontally and strike the ground x m away.The velocity with which the stone flies off the circle is? The centrip..
A rider on a motorcycle that hass a mass of 195 kg is traveling with a speed of 24 m/s. What is the approximate total rational kinetic energy of the wheels
A parallel-plate capacitor is constructed using a dielectric material whose dielectric constant is 2.90, Find the minimum area of the capacitor plates
An internal explosion breaks an object, initially at rest,into two pieces, one of which has 1.5 times the mass of the other. how much kinetic energy did each piece acquire
q1. a positively charged particle of mass 6.00 10-8 kg is travelling due east with a speed of 25 ms and enters a 0.46 t
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