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A boy with a mass of 60 kg is hanging from a spring with a spring constant of 160 N/m. With what frequency does the boy bounce up and down?
Hz=?
A farsighted man uses eyeglasses with a refractive power of 2.10 diopters. Wearing the glasses 0.03 m from his eyes, What is the correct contact lens prescription
A 0.75 kg ball attached to the end of a horizontal cord, is rotated in a circle of radius 1.9 m on a frictionless horizontal surface, What is the max speed the ball can have
A rocket with an initial mass of 1 000 kg adjusts its thrust by varying the rate at which mass is ejected. at what rate is mass being ejected at that instant
Consider a flagpole (mass 20kg and length 10m) attached to the wall by a cable, What is the magnitude and direction of the force exerted by the hinge on the flagpole
In the alpha decay of 211 Bi to 207 Tl two groups of alpha particles with known energies 6.623 and 6.279 MeV, are observed. What is the energy difference between these two states
A boat is heading upstream when a float is dropped overboard and carried downstream. What is the boats speed in still water
Compute what resolving power is needed to measure with a spectrograph the natural line width of the alpha particles from Po-212
The equation of a transverse wave traveling along a very long string is y = 5.5 sin( 0.055?x + 36.0?t ), What is the maximum transverse speed of a particle in the string
What is the final charge of each conductor. Two identical spherical conductors X and Y are mounted on insulated stands. X carries the charge of +8.0nC and Y carries a charge of -2.0nC.
What is the magnitude of the net torque exerted on the branch by the children? Suppose that the axis is located where the branch joins the tree trunk and is perpendicular to the plane formed by the branch and the trunk.
A circular loop of conducting wire is placed in a magnetic field of 0.45T while the free ends of the wire are attached to a 30ohm resistor. What are the magnitude and direction of the current in the resistor
A Carnot engine extracts 850 J from a 600 K reservoir during each cycle and rejects 450 J to a cooler reservoir. Find the temperature of the cool reservoir
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