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Question1
A 70-g disk sits on a horizontally rotating turntable. The turntable makes 4 revolutions each second. The disk is placed 12cm from the axis of rotation of the turntable.
a. What is frictional force acting on the disk?
b. The disk will slide off turntable if it is located at a radius larger than 18 cm from the axis of rotation. What is the coefficient of static friction?
Question2
To store an energy produced in 1.0 hour by a 140 electric-power plant, how various cubic meters of water will have to be pumped from the lower to the upper reservoir? Suppose the upper reservoir is 470 above the lower and we can neglect the small change in depths within each. Water has a mass of 1000 for every.
Three equal positive point charges of magnitude Q = 6.00? C are located at three corners of a square of edge length d = 2.6 cm, What is the magnitude of the attractive force
Keilah, in reference frame S, measures two events to be simultaneous. Event A occurs at the point (37.0 m, 0, 0) at the instant 9:00:00 Universal time on January 15, 2010. What time interval elapsed between the events
Vector F= 3xi + 5j + 5z^2k. How much work is done in moving from r0=(0,0,0) to r1=(3,2,1)? how fast will the object be going
A coil of wire with 217 circular turns of radius 3.20cm is in a uniform magnetic field along the axis of the coil. The coil has R = 41.5?, calculate the average emf induced in the coil
What is the lowest frequency for standing waves on a wire that is 11.5 m long, has a mass of 120.0 g, and is stretched under a tension of 185.0 N
A charge of 2.05mC is placed at each corner of a square 0.160m on a side. Determine the magnitude of the force on each charge
A magnetic field of 2.00T is applied to a bubble chamber to make the tracts of protons, what is the momentum of the proton
A cell membrane is composed of lipid molecules and approximately 11 nm thick, what is the approximate capacitance of a spherical cell that has a diameter of 11mu or micro m
According to Equation 20.7, an ac voltage V is given as a function of time t by V = Vo sin 2ft, what is the smallest value of the time at which the voltage equals one-half of the peak-value
a subatomic particle is traveling with a gamma factor of 20 as observed by a radiation monitor in a nuclear power plant. What is the proper lifetime of such a particle
What is the charge on each sphere if the two charges are alike?
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 88.8 m/s2 for 1.58 seconds, at which point its fuel abruptly runs out.
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