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A weightlifter bench-presses a 170.0 kg barbell from his chest to a height equal the length of his arms 0.750 m. How much work does he do? 1250.775 j I need to know What is the potential energy of the barbell relative to the weightlifter\'s chest after he lifts the barbell? and How many food calories does the weightlifter use if he does this lift 35 times? Assume the weightlifter does no work in letting the barbell drop back to his chest.
A car of mass 920.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 41.0 km/hr (11.4 m/s), the net power which the engine supplies is 4300.0 W (in addition to the extra power required to make up for air resista..
A pulsed carbon dioxide laser has an energy output of 1.00 J. This energy is released in the form of a 10^9 W pulse of infrared radiation lasting 10^-9 s, Find the equivalent capacitance of the network
question1find out the normal force for a laundry basket with a mass of 3.4 kg in each of the following situationsa at
A 78-kg fisherman in a 137-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.0 m/s, find the velocity of the boat after the package is thrown
A vertical spring is 10.0 cm long when supporting a 20.0 kg mass, and it is 12.0 cm long when supporting a 32.0 kg mass. What is the length of spring with zero load
As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. how long must the engines be fired
Suppose you measure a cylinder and determine that the radius is 0.52 + 0.01 cm and its height is 3.20 + 0.15 cm. What is the most likely value for the volume of the cylinder
Two capacitors when connected in parallel give an equivalent capacitance of 9.00 pF and give an equivalent capacitance of 2.00 pF when connected in series
A certain lightbulb is rated at 95 W when operating at an rms voltage of 1.95 V. What is the peak voltage applied across the bulb
A man pushes a wooden crate on wooden floor. The direction of the force is 30o from the horizontal. How much force does he use in order to maintain a constant speed
8g of helium at an initial temperature of 280Kinteracts thermally with 7.0g of oxygen at an initial temperature of 550K What is the final thermal energy of each gas
A 3.9 kg stone is tied to a 5.8 m long string and swung around a circle at a constant angular velocity 1.7 1/s. Find the magnitude of the torque about the origin
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