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A 28.0 child plays on a swing having support ropes that are 2.10 long. A friend pulls her back until the ropes are 45.0 from the vertical and releases her from rest.
What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing?
How much work does the tension in the ropes do as the child swings from the initial position to the bottom?
The Sun is a low mass star and so would never have the core fusion reactions of massive stars. Yet, the Sun has iron in its atmosphere, as well as gold, silver and other elements much heavier than iron and why?
The displacement of a particle moving under uniform acceleration is some function of elapsed time and acceleration. Suppose we write this displacement as: s=ka^mt^n where k is the dimensionless constant.
At time t = 0, the hockey puck is sent sliding over a frozen lake, directly into a strong wind. Gives the velocity v of the puck versus time as puck moves along a single axis. (The time axis is marked in increments of 0.25 s.) At t = 2.8 s, what i..
The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50.0° angle with the ground. Explain how far up the ladder can an 900 N person climb before the ladder begins to slip?
If the weight of a room full of water is so great, why don't the first floors of houses built over basements all collapse as flooded to the ceiling.
An outfielder throws a baseball to his catcher in an attempt to throw out a runner at home plate. The ball bounces once before reaching the catcher.
What is the turntable rotation angular velocity
A 8 m x 11 m swimming pool slopes linearly from a 1 m depth at one end to a 3.8 m depth at the other. What is the mass of water.
What is an average magnitude of the Pointing vector 5.0miles from a radio transmitter broadcasting isotropically with an average power of 250-kW?
An object of mass m is attached to a horizontal spring, stretched to a displacement A from equilibrium and released, undergoing harmonic oscillations on a frictionless surface with period T0. The experiment is then repeated with a mass of 4m. The sub..
Consider a standing wave on the string with a frequency equal to the fifth harmonic (fn = nf1 with n = 5). How many nodes and antinodes does this standing wave possess.
The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.870, and the log has an acceleration of 0.800 m/s2. Find out the tension in the rope.
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