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You perform a knee extension exercise on a cable type machine during which your knee joint rotates through an angular displacement of 0.85 radians in 4.35 second. At the beginning and end of that time the weight is motionless. That action, together with the various ratios in the machine causes a weight of 422 Newton to be lifted a total of 0.35 meter. Find your average knee torque during the lift?
An elastic cord is 69.3 centimeter long when a weight of 70.2 Newton hangs from it but is 87.1 centimeter long when a weight of 184 Newton hangs from it. Obtain the spring constant of this elastic cord
Use the Rydberg equation to calculate the wavelength in nm of the light emitted, What is the color of the light emitted
a 2.0kg ball traveling at 2.0m/s collides head on with a 1kg ball intially at rest. Fraction of initial kinetic energy lost during the collision
you are helping your friend prepare for her next skate board exhibition. for her program she plans to take a running
A freezer is used to freeze 5.0 L of water completely into ice. The water and the freezer remain at a constant temperature of T = 0°C. Determine the change in the entropy of the water
What is the capacitance after the separation becomes 2d.
A 20.0kg crate slides down a 29° incline at constant speed. What is the force of friction between the crate and incline
A flat observation screen is placed at a distance of 4.5 m from a pair of slits. The separation on the screen between the central bright fringe and the first-order bright fringe is 0.043 m. Determine the slit separation
To push a 23 kg crate up a frictionlessincline, angled at 21° to the horizontal, a worker exerts aforce of 96.9 N, How much work is done on the crate by the weight of the crate
Suppose that an ion source in a mass spectrometer produces doubly ionized gold ions (Au2+), each with a mass of 3.27e-25 kg. Determine the radius of the path
Consider an airplane window (area 0.33 m2). If the pressure inside the plane is atmospheric pressure and the pressure outside is 21% of Patm, what is the force on the window
Starting with 2.10 mol of N2 gas (assumed to be ideal) in a cylinder at 1.00 atm and 21.0 °C, a chemist first heats the gas at constant volume, Calculate the amount of work done by the gas
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