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The resistance of a very fine tungsten wire with a 10 micro m x 10micro m square cross section is 2978 ohm how long is the wire? A 2978 ohm resistor is made by wrapping this wire in a spiral around a 3.9 mm diameter glass core. How many turns of wire are needed?
A single mass m1 = 4.5 kg hangs from a spring in a motionless elevator. The spring is extended x = 15.0 cm from its unstretched length. find the force the bottom spring exerts on the bottom mass
You are at the controls of a particle accelerator, sending a beam of 3.00×107 protons (mass ) at a gas target of an unknown element. Find the mass of one nucleus of the unknown element
a convex spherical mirror whose focal length has a magnitude of 15.0cm is to form an image 10.0cm behind the mirror. a
Attempting to stop on a slippery road, a car moving at 80 skids across road at a 30 angle to its initial motion, coming to a stop in 3.8.
On an essentially frictionless, horizontal ice rink, a skater moving at 4.1 m/s encounters a rough patch that reduces her speed by 49% due to a friction force that is 26% of her weight. find the length of this rough patch
A ball of mass M = 17 kg is suspended from a vertical inextensible string of length l = 1.5 m. A bullet of mass m = M/2 traveling with a horizontal velocity v = 9sqrt(g*L) collides with the ball, What is the velocity of the ball-bullet system
Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Determine the period of the orbit
A mass of 2.4 kg is moving at 19.2 m/s in the positive x direction. What is the total kinetic energy of both masses
A block of mass M hangs from a spring having spring constant k = 12 N/m and oscillates up and down with simple harmonic motion. What is the maximum speed of the block
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.60 104 m/s, and the radius of the orbit is 5.00 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellit..
How many half-lives are required for the number of radioactive nuclei to decrease to 1/1010 of the initial number
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 1.20 10-10 T. How much energy does this wave carry through the window during a 65-s phone call
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