What force is exerted on person by gravitational attraction
A person weighs 180lbs at sea level. the radius of the earth is 3960 mi. what force is exerted on the person by the gravitational attraction of the earth if he is in a space station in near-earth orbit 200 mi above the surface of the earth?
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A wind tunnel made of circular duct consists of a contracting nozzle, a test section in which experiments are conducted, a system of piping to recirculate the flow, and a fan to drive the air (see figure).
A certain airplane can accelerate on the runway at a rate of 2.5 m/s2 and must attain a speed of 30 m/s in order to take off. What is the minimum length of a runway on which this plane could take off?
A 120 lbm base jumper (extreme parachutist) leaps from El Capitan in Yosemite National park (3000 ft vertical drop) head first. What is her terminal velocity? She plans to open her chute 350 ft from the base of the cliff.
For the chi-square test for goodness of fit, what is the value of df for a test with four categories and a sample of n=100?
A man pushes on a 60-lb crate with a force F.The force is always directed down at a 30 degrees from the horizontal and its magnitude is increased until the crate begins to slide.
Calculate the energy of H2 molecule where nx = ny = nz - 10. By comparing this energy to kT with T = 300K, determine whether a classical or quantum mechanical description can be used.
Consider an infinitely large homogeneous mixture of 235U and a moderating material. Determine the ratio of fuel-to-moderator density that will render this system critical for the moderators.
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