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George is going to bungee jump from a bridge that is 55.0 m over the river below. The bungee cord has an unstretched length of 27.0 m. To be safe, the bungee cord should stop George's fall when he is at least 2.00 m above the river. If George has a mass of 75.0 kg, what is the minimum spring constant of the bungee cord?
a proton has an initial speed of 4.0 105 ms. a what potential difference is required to bring the proton to rest? b
Suppose a hockey puck slides down a frictionless ramp with an acceleration of 5.90 m/s2, What angle does the ramp make with respect to the horizontal
A bird stands on a dc electric transmission line carrying 3200A. What is the potential difference between the bird's feet
question human lungs have evolved to breathe oxygen at a pressure as that in the atmosphere 0.21 atm. if a particular
Communications satellites are placed in a circular orbit where they stay directly over a fixed point on the equator as the earth rotates. What is the period of a satellite in a geosynchronous orbit
The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. The mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain by the block and tackle pulley system. What is the work done..
The outer surface of a skier's clothes of emissivity 0.700 is at a temperature of 7.40° C. Find the rate of radiation if the skier has a surface area of 1.50 m2
The springs of a 1200 kg car compress 5.0 mm when its 68 kg driver gets into the driver's seat. If the car goes over a bump, what will be the frequency of vibrations
On a humid day, an electric field of 2.00 * 10^4 N/C is enough to produce sparks about an inch long. Suppose that in your physics class, use Coulomb's law to calculate the electric field at the surface of the sphere
Calculate the energy needed to accelerate a spaceship of mass10,000 kg to a speed of .3c for intergalactic spaceexplortation. Compare this with a projected annual energy usage onEarth of 1021.
The windpipe of a typical whooping crane is about 4.5 feet long. What is the lowest resonant frequency of this pipe
when 92.8 v is applied across a wire that is 9.8 m long and has a 0.32 mm radius the magnitude of the current density
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