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In starting an exercise, a 1.61 m tall personlifts a 2.18 kg book on the ground so it is 2.26m above the ground. What is the potential energy ofthe book relative to the ground? What is the work done bythe person's head?
When a 0.2 kg mass is suspended from a vertically hanging spring it stretches the spring from its original length of 0.5 cm to a total length of 6.0 cm. what is the maximum speed of the mass as it oscillates
As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 510m to be the other plate.
A 9.7 g object moving to the right at 11cm/s makes an elastic head-on collision with a 14 gram object moving in the opposite direction at 47 cm/s
A solar collector is placed in direct sunlight where it absorbs energy at the rate of 903 J/s for each square meter of its surface. What equilibrium temperature does the collector reach
A 180 g block on a 49 cm-long string swings in a circle on a horizontal, frictionless table at 74 rpm.
A rubber ball of mass 27.5 g is dropped from a height of 1.85 m onto a floor. What impulse was applied to the ball during the collision
A certain species of ionized atoms produces an emission line spectrum according to the Bohr model, but the number of protons Z in the nucleus is unknown. A group of lines in the spectrum forms a series in which the shortest wavelength is 10.13nm and ..
You have been called to testify as an expert witness in a trial involving an automobile accident, determine that the coefficient of kinetic friction between the wheels and the pavement at the time of the accident was 0.59
A bar of length 2cm slides along metal rails at a speed of 1cm/s. The bar and rails are in a magnetic field of 2T, What is the induced emf in the bar and rails
A 50 g ice cube floats in 200 g of water in a 100 g copper cup; all are at a temperature of 0°C. What is the mass of the lead
For the third circuit, consisting of a single battery and two light bulbs in parallel, What is the current through each bulb
During normal operation, a computer's hard disk spins at 7200 rpm. what is the average angular acceleration of the hard disk
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