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A skateboarder starts from the side of a circular ramp of radius r = 4 m and travels downward. He would like to have the normal force on him be five times as large as his weight at the bottom of the ramp. (a) Draw a free body diagram for the skateboarder at the bottom of the ramp. Your arrows must be the correct length. (b) How fast must he be go
An airplane of mass 1.40 x 10^4 kg is in level flight, initially moving at 56.0 m/s. Find the speed of the airplane after it has traveled 4.4 102 m
A typical lightbulb in your house is rated 137 W, which means that the lightbulb dissipates 137 W when connected to a DC voltage of 110V. what is the dissipated power
The range of a projectile depends not only on v0 and ?0 but also on the value g of the free-fall acceleration, which varies from place to place. by how much would his record have differed
A plate carries a charge of -3.9 µC, while a rod carries a charge of 2.9 µC. How many electrons must be transferred from the plate
Gayle runs at a speed of 8.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 23.0 m. What is their speed at the bottom of the hill
A very long, thin straight line of charge has a constant charge density of 20 pC/cm. How far does the electron go before it comes back
A parallel-plate air capacitor with a capacitance of 233 has a charge of magnitude 0.159muC on each plate. What is the surface-charge density on each plate
An engine absorbs 1698 J from a hot reservoir and expels 1205 J to a cold reservoir in each cycle. How much work is done in each cycle
Two wires, one of gold and the other of tungsten, are heated from 18 degrees C to the same final temperature. what is the percentage increase in the resistance of the tungsten wire
A ball thrown horizontally at 28 m/s travels a horizontal distance of 55 m before hitting the ground. From what height was the ball thrown
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. find the tension in the tightrope
A mountain climber wears a goose down jacket 2.6cm thick with total surface area 0.95 m2. Determine the rate of heat flow by conduction through the jacket assuming it is dry
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