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A man eats a dessert that contains 170 Calories. (1 Calorie = 4186 J) The skin temperature of the man is 37.4 °C and that of her environment is 20.8 °C. The emissivity of her skin is 0.78 and its surface area is 1.3m2. Find how many hours would it take her to emit anet radiant energy from her body that is equal to the energy contained in this dessert?
While working on the new Science building, the construction crew uses a bulldozer to push a large boulder across the site at a constant speed over a distance of 82.0 m. determine the amount of work done by all of the forces acting on the boulder
A 3.60-kg object is attached to a spring and placed on frictionless, horizontal surface. A horizontal force of 9.0 N is required to hold the object at rest when it is pulled 0.200 m from its equilibrium position, Where does this maximum speed occur
A highway curve of radius 560m is designed for traffic moving at a speed of 94.0km/hr. What is the correct banking angle of the road
A train is traveling up a 3.3 incline at a speed of 2.45 when the last car breaks free and begins to coast without friction. Explain how long does it take for the last car to come to rest momentarily?
A satellite in Earth orbit has a mass of 91 kg and is at an altitude of 1.97 x 10^6 m. What is the potential energy of the satellite%u2013Earth system
A conductor is arranged in the shape ofa rectangle with sides 1.0 m in length and 1.0 cm in width. what repulsive force acts on the center
A 1000 kg roller coaster car starts from rest from a hilltop 60.0 m above the ground and moves (without power) down, what is the average frictional force between the car's wheels and the track
A tightrope walker is practicing. She is balanced on a rope at the exact midpoint of the rope. What angle with the horizontal does it make
A string is wrapped tightly around the circumference of a wheel with a mass of 1.23 kg and a radius of 0.324 m. What is the moment of inertia of the wheel
A pitcher claims he can throw a 0.145-kg baseball with as muchmomentum as a 3.00-g bullet moving with a speed of 1.50 x 103m/s. What must the baseball's speed be if the pitcher's claim is valid
You see condensed steam expelled from a ship's whistle 2.50 s before you hear the sound. how many meters are you from the ship
A fan is spinning at 900 rpm. When its motor is turned off it makes 75 rev before coming to a stop. If the work down by dissipative forces is 44.4J, Find the moment of Inertia of the fan and the torque due to dissipative forces.
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