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Two children are sliding down a snowy hill which is inclined by 43.5 degrees with respect to horizontal. One has a rough sled which has a coefficient of kinetic friction between it and the snow of μ?k = 0.374; the other has a slippery sled which has a coefficient of kinetic friction between it and the snow of μ?k= 0.142. If both children start at the top of the 41.2 m tall hill initially at rest, what is the difference in speed between these two sleds at the bottom of the hill?
Three point charges are arranged along the x-axis. Charge q1= -4.85 nC is located at x1= 0.205m , and charge q2= 2.75 nC is at x2= -0.310m, What is the direction of the net force on q3
in a interference experiment d 4mm l 1m the second maximum n 2 appears on the screen at a distance 4mm from the
If a person standing inside an elevator is moving up at uniform speed of 4m/s what is the normal force on her feet? Weight of the person is 60kg
A 30.0-kg box is being pulled across a carpeted floor by a horizontal force of 230 n, against a friction force of 210 n. What is the acceleration of the box
a nylon rope of length 25.0 is under a tension of 1.30 x 10^4 N. The total mass of this rope is 2.30 kg. how long does it take to reach the other end
There are 50x10^6 homes in the US. Each home has one light bulb which runs one hour per day. all have 75watt light bulbs. How much energy per year do they use for lighting
A cyclotron is operated at an oscillator frequency of 12 MHz, and has a Dee radius of 0.53m. Calculate the magnetic field needed to accelerate deuterons
The spin cycles of a washing machine have two angular speeds, 409 and 608 . The internal diameter of the drum is 0.610, compute the laundry's maximum tangential speed
A mass of 5.0 kg is attached to one end of a spring with a spring constant 80 N/m. The other end is attached to a rigid wall. The spring is initially at rest in its equilibrium position, then a force of 100 N pulls the mass away from the wall, str..
If both the emissivity and the solar absorptivity of the outer surface are 0.8, determine the effective thermal conductivity of the wall.
Describes possible scenarios among following
Assume that when the racket hits the ball, it is momentarily at rest, so assume that the speed of the racket is zero. Also, assume that the collision is elastic (No loss of energy). Suppose that the contact last delta t -= 10-3 s. Compute the avera..
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