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As part of an exercise routine a 47.0 kg person climbs a set of stairs. Each stepis18.0 cm high and thereare 78 steps in the staircase.Assuming the work done coming down the staircase is negligible, howmany times must this person climb the staircase in order to workoff as much energy as a 2030 Calorie meal?
Unpolarized light of intensity I0 is incident on three polarizing filters. The axis of the first is vertical, What light intensity emerges from the third filter
Calculate the momentum of a 17m^3 of air (density of 1.3kg/m^3) hitting a sky diver traveling 52 m/s
One of the concrete pillars that supports a house is 2.3 m tall and has a radius of 0.69 m. Find the weight of this pillar in pounds
Calculate the inductance of a solenoid that is 1.0 cm long and 3.2 mm in diameter, with 210 turns of wire
A wheel spinning at 25 rev/s is slowed to a stop by a constant acceleration while turning 50rev. What is the magnitude of the constant acceleration
A river flows due east at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 15 m/s due north relative to water.
q 1. the highest musical note on a piano has a frequency of 4286 hz. why would a tape of piano music sound terrible if
The rms current in a 43 ohm resistor is 0.58 A. What is the peak value of the voltage across this resistor
You have a sample of Xenon in a rectangular container. The gas exerts a total force of 2.03 N perpendicular to one of the container walls
The photoelectric threshold wavelength of a tungsten surface is 272 nm. What is the threshold frequency of this tungsten
A ball is tied to the end of a cable of negligible mass. What is the magnitude of the acceleration of the ball
A 8000-kg car is traveling at 1.7 m/s along a horizontal road when the brakes are applied. How much kinetic energy does the car lose
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