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(a) Calculate the energy in kcal used by a 50-kg woman who does 53 deep knee bends in which her center of mass is lowered and raised 0.400 m. (She does work in both directions.) You may assume her efficiency is 20%. kcal
(b) What is the average energy consumption rate in watts if she does this in 3.00 min?
Does the heat of vaporization of water depend strongly on the relative humidity of the gas into which it evaporates?
A ball is thrown horizontally with a speed of Vo = 20.0 m/s from the top of a building of height h = 42.1 meters. What is the angle below the horizontal made by the velocity vector of the ball
Compute the buoyant force experienced by a steel shell totally submerged in fresh water.(The radius of the shell is70.0 cm and its mass is 1990kg.) What will occur if the shell is released (while experiencing this buoyant force)?
a gas while expanding under isobaric conditions does 480 j of work. the pressure of the gas is 160000 pa and its
A compound microscope has an objective lens of focal length 15.0 mm and an eyepiece that gives an angular magnification of 5.00 for a final image at infinity, What is the total magnification of the microscope
a 2.0 kg ball and a 3.5kg ball are connected by a 2.5m long rigid massless rod. the rod and balls are rotating
A dolphin leaps out of the water at an angle of 34.2 ° above the horizontal. The horizontal component of the dolphin's velocity is 8.71 m/s. Find the magnitude of the vertical component of the velocity
Water flows at 0.990m/s from a hot water heater, through a 450-kPa pressure regulator. What is the flow speed in this pipe
A world war I cannon mounted on a railcar and set therefore that it will project a shell at an angle of 30o above the horizontal. If the mass of the real car plus cannon is 5000 kilogram, find what will be the recoil velocity of the car along the ..
Three resistors, 29, 47, and 77 ?, are connected in series, and a 0.49-A current passes through them. obtain the potential difference across the three resistors
A person with a near-point distance of 37 cm is able to get a usable magnification of 15 with a particular magnifying glass. What is the friend's near-point distance
A baseball is thrown upwards with a speed of 15.0 m/s. How long does it take the baseball to reach its maximum height
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