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a solid wood door 90 cm wide by 2.00 m tall has a mass of 35.0 kg. it is ajar and at rest. a ball with a mass of 500 g is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. the ball rebounds with a speed of 16.0 m/s along the same line. how much energy is lost in the process?
A 770 kg car moving at 21 m/s brakes to a stop. The brakes contain about 15 kg of iron, which absorbs the energy. What is the increase in temperature of the brakes.
A little league player balances a bat 57.0 cm from one end. She then hangs her 0.540-kg batting helmet on that end of the bat, Determine the mass of the bat
Two blocks with masses, 2.5kg and 3.5kg, rest on a frictionless surface and are connected by a light string, What is the magnitude of the force in the string
Suppose that white light is reflected from a thin soap film. what color will the film appear to be when viewed in reflected light
(a) Calculate the R-value of a thermal window made of two single panes of glass each 0.100 in. thick and separated by a 0.200-in. air space. By what factor is the transfer of energy by heat through the window reduced by using the thermal window inst..
Two objects X and Y are observed traveling in space under the influence of the gravitational attraction of the Sun. Determine the smallest speed of the object in the orbit
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 1.20 10-10 T. How much energy does this wave carry through the window
Low-frequency vertical oscillations are one possible cause of motion sickness, with 0.20 hz having the strongest effect. How much time elapses between two waves hitting the ship
A light bulb operating at 110V draws 1.82A. Determine its resistance and the amount of power it draws
A Light-Dimmer Circuit The intensity of a lightbulb with a resistance of 140 Ohms is controlled by connecting it in series with an inductor whose inductance can be varied from L=0 to L=Lmax. What is the average power dissipated in the lightbulb whe..
A runaway, 400-kg wagon enters a cornfield with a velocity of 12 m/s and eventually comes to rest. What work was done on the wagon in kJ
An ice chest at a beach party contains 15 cans of soda at 3 ° C. Each can of soda has a mass of 0.38 kg, determine the final temperature T of the soda and watermelon
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