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If you strap a 10-kg weight to your heel and then straighten out your leg as shown in the diagram, calculate the torque around your knee joint due to the weight at each of the four angles indicated. (You may ignore the gravitational force on your leg itself.)
A running student has half the kinetic energy that his younger brother has. The student speeds up by 1.3 m/s, at which point he has the similar kinetic energy as his brother. If the student's mass is twice as large as his brother's mass, what were th..
It is determined by immersing a crown in water that its volume is 26inc^3=4.2x10^-4m^3. What would its weight be if it were made of pure gold
The age of a piece of wood from an ancient source is determined by carbon dating. The carbon-14 content of a sample of the wood is found to be one-fourth that of living trees. The half life of carbon-14 is 5730 years. How old is the piece of wood?
A goose flying toward you at 11.4m/s emits a squawk, which you hear at 262Hz, Find the wavelength of the sound you hear
two stationary positive point charges charge 1 of magnitude 3.15nc and charge 2 of magnitude 1.75nc are separated by a
q1. a certain groove in phonograph record moves past the needle at 36 cms. if the wiggles in the grove are 0.1 mm apart
What is the upward force exerted by the ground on him treating it as a constant? Find work done by normal reaction from ground.
a proton and an electron are moving due east in a constant electric field that also points due east. the electric field
A positive charge of .0001096 C experiences a force of .159 N when located at a certain point. What is the electric field magnitude at that point
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.13 m. What is the magnitude of the initial acceleration of the third sphere
A massless rope connects two blocks through a frictionless pulley with a moment of inertia I = 0.4 kgm 2 and a radius R = 0.2 m. Find velocity of the second block just before it hits the ground
A 72.3 kg man carrying a 5.23 kg box gets on an elevator. As the elevator accelerates upwards at 0.224 m/s^2, he feels the box is heavier, During this time, what is the weight on the floor from his feet
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