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On a cold day, Ming rubs her hands together to warm them up. She presses her hands together with a force of 4.1 N. Each time she rubs them back and forth they move a distance of 16 cm with a coefficient of kinetic friction of 0.44. Assuming no heat flow to the surroundings, after she has rubbed her hands back and forth eight times, by how much has the internal energy of her hands increased?
Over 500 planets have so far been detected beyond our solar system. This is accomplished by looking for the effect the planet has on the star. The star is not truly stationary; instead, it and its planets orbit around the center of mass of the sys..
A car with a total mass of 1.57 103 kg has wheels of radius 32.5 cm and moment of inertia 0.875 kg · m2. Find the car's rotational energy when the car is moving at a speed of 21.0 m/s
It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. You can model the spiral motion as uniform circular motion combined with a constant upward velocity. Assume a bird completes a circle of radius 6...
A horizontal power line of length 58.2 m carries a current of 2.18 kA northward .The Earth's magnetic field at this location has a magnitude of 5.30 X10^-5 T. Find the magnitude of the magnetic force on the power line
A 40.0 kg girl and a 8.4 kg sled are on on ice (frection coefficient 0.01) of a frozen lake, draw free body diagrama for the girl and the sled
Two point charges lie on the x axis. A charge of +9.5 µC is at the origin, and a charge of -9.5 µC is at x = 10.0 cm, What is the net electric field at x = -4.0 cm
Two masses of 1.50 kg each, connected by a string, slide down a ramp making an angle of 37° with the horizontal. The coefficient of kinetic friction between M1 and the ramp is 0.39. The coefficient of kinetic friction between M2 and the ramp is 0.14...
A lifeguard sits on his watchtower at the edge of the pool at a height h=2.0m above the surface of the water. What is the depth of the pool at the location of the watch
Two charges are placed on the x axis. One of the charges q1= +8.5 C is at x1 = + 3.0 cm and the other q2= -21C is at x1 = + 9.0 cm. Find the net electric field (magnitude and direction) at.
An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.60 mm. An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.60 mm.
Three resistors, with values of 3.0, 6.0 and 12.0 ?, respectively, What is the overall resistance of this combination
A block weighing 15.0 N is attached to the lower end of a vertical spring (k = 122.0 N/m), What is the maximum kinetic energy of the block as it oscillates
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