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A weightlifter lifts 200 kg from the floor to a height of 2 m in 2 s.
(a) How much work did the weightlifter perform?
(b) With what power did the weightlifter lift the weight (on average)?
(c) What is the potential energy of the weights at that height?
A destroyer sends a sonar pulse out to detect a submarine directly below the ship in the ocean. find how deep is the submarine
The two blocks, m1 = 1.40 kg and m2 = 5, are connected by a mass less rope that passes over a pulley. The pulley is 12 cm in diameter and has a mass of 2.0 kg.
The pilot of an airplane travelling 170 wants to drop supplies to flood victims isolated on a patch of land 200 below. The supplies must be dropped how many seconds before the plane is directly overhead.
A 130 block on a frictionless table is firmly attached to one end of a spring with = 40. The other end of the spring is anchored to the wall. A 21 ball is thrown horizontally toward the block with a speed of 6.6.
A block with mass m = 4 kg is sitting on the ground and not moving. The acceleration due to gravity is g = 9.81 m/s2. Please answer the following questions.
An ideal gas is expanded isothermally from 20L to 30L. During thismethod , 6J of energy is expended by the external mechanism that expanded the gas. Which of the statements is correct.
A source delivers an AC voltage of the form ?v = 92.2 sin (60?t), Find the rms voltage of the source
What is the direction of E for points. find the balls initial speed.
The coefficient of kinetic friction between her skis and the snow.
What is the rate of change entropy of the first reservoir.
A conical pendulum is formed by attaching a 50 g mass to a 2 m string. The mass swings around a horizontal circle of radius 1 m. What is the acceleration of the mass
Presume the electron is at the midpoint between the proton.
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