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1. A uniform beam 16.0 feet long and weighing 300 pounds is placed such that it protrudes 4.0 feet over the edge of a flat roof. How far out from the edge of the roof can a 150-pound man walk on the beam without tipping the beam?
2. A uniform ladder 10.0 feet long and weighing 30 pounds is placed against a perfectly smooth wall, its lower end being 6.0 feet from the wall. What is the least coefficient of static friction between the lower end of the ladder and the floor that will permit a 160-pound man to.
Find the drift velocity of conduction electrons in a gold wire of diameter 1.03 mm when a current of 0.221 A flows in it. The density of conduction electrons in gold is 5.90 X 10^28 m-3
A capacitor is charged to a potential of 12.0 V and is then connected to a voltmeter having an internal resistance of 3.50M%u03A9. What is the time constant of the circuit
Assume you have a 1.1 μC point charge. Determine how far in meters from the charge will the potential be 75 Volt if it is zero at infinity
An alpha particle approaches a 197 AU nucleus with a speed of1.5x10^7 m/s. In what direction does the nucleus recoil, and with what speed
A ball is thrown upward with an initial velocity of 96 ft/secfrom the top of a 100 ft building. What equation models the height of the ball as a functionof the time t? When will the ball attain its maximum height?
A foul ball is hit straight up into the air with a speed of about 25 m/s. How long is it in the air
A 550 -cm flask contains 0.450grams of a gas at a pressure of 140kPa, What is the molecular mass of this gas
A woman on a bridge 97.0 m highsees a raft floating at a constant speed on the river below. Shedrops a stone from rest in an attempt to hit the raft. Find the speed of the raft
calculate the maximum height to which gasoline can be raised in such devices
A 1960 kg weather rocket is launched straight up. The rocket motor provides a constant acceleration for 22.03 s, then the motor stops. The rocket altitude 26.3 s after launch is 6641. You can ignore any effects of air resistance.
A walkway suspended across a hotel lobby is supported at numerous points along its edges by a vertical cable above each point and a vertical column underneath. The steel cable is 1.27 cm in diameter and is 5.85 m long before loading.
The inner and outer surfaces of a cell membrane carry a negativeand positive charge, respectively. estimate the magnitude of the electric field in the membrane
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