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The graphite in a pencil has a resistivity of7.84×10−6 W×m.The graphite's diameter is 0.700 mm and its length is40.0 mm. (a) Find the resistance of this graphite "wire." (b) Find the diameter of a cylindrical copper wire of the same length(having resistivity 1.70×10−8 W×m) that would produce the same resistance.
A 1500-kg car starts from rest to reach 60.0 miles/h in 7.50 s. What is the engine's power output and How much work is done by the engine during the acceleration
An oscillator consists of a block attached to a spring (k = 450.0 N/m). At some time t the position (measured from the system's equilibrium location),velocity, What is the mass of the block
A uniform cylinder (radius = 10.0 cm) is mounted so as to rotate freely about a horizontal axis that is parallel to and 5.0 cm from the axis of the cylinder, what's the angular speed of the cylinder
The driver of a motorboat that can move at 10 m/s wishes to travel directly across a narrow strait in which the current flows at 5 m/s. At what angle upstream should the driver head the boat
A man doing a slow push-up is approximately in static equilibrium. His body is horizontal, with his weight of 757 N supported by his hands and feet, how far from the shoulders is the man's center of gravity
A 10.0kg block of ice is sliding due east at 8.00 m/s when it collides elastically with a 6.00kkg block of ice, Determine the velocities of the blocks of ice
A cylindrically shaped piece of collagen (a substance found in the body in connective tissue) is being stretched by a force that increases from 0 to 2.73 10-2 N. How much work is done by the variable force that stretches the collagen
How far from a point on the floor directly below the edge. Why is it a good idea to have your hand extended forward when you are getting ready to catch the fast moving baseball with your bare hand.
What torque do his back muscles exert about an axis through his hips.
A weight lifter does a series of arm raises while holding a 3.00 weight. Her forearm (including the hand) starts out horizontal and pivots to a vertical position about her elbow. What is the change in its gravitational potential energy with each ar..
A 15 N horizontal force pushes a block weighing 4.8 N against a vertical wall, what is the force on the block from the wall
A small block with mass 0.0525kg slides in a vertical circle of radius 0.0750m on the inside of a circular track. What is the magnitude of the normal force that the track exerts on the block when it is at the top of its path
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