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A student (m=63 kg) falls freely from restand strikes the ground. During the collision with the ground, hecomes to rest in a time of 0.010 s. The average force exertedon him by the ground is +18,000 N, where the upward direction istaken to be the positive direction. From what height did thestudent fall? Assume that the only force acting on him during thecollision is that due to the ground.
A popular pastime is to see who can push an object closest to the edge of a table without its going off. what was the object's speed as you released it
the sled (100kg) rides on a slope, 30 degrees to the horizontal. The coefficient of friction is 0.8. what force is needed move the sled down
A span of a bridge is 200.00m at 10.0c Its length increases to 200.25m when the temperature increases to 40.0c. what is the coefficient of thernmal expansion of the material
A mass of 180g is held by a horizontal spring of constant 22 N/m. It is displaced from its equilibrium position and released from rest. What is the magnitude of initial displacement
at a certain location the earth has a magnetic ?eld of 8.3 times 10-5 t pointing in the northward direction at 44?
Violet light and red light travel through air and strike a block of plastic at the same angle of incidence. Find the index of refraciton for violet light in plastic
Every day our Earth receives 1.55×1022 J energy from the Sun. If we were able to use 1.05 percent of this energy to accelerate spaceships, how many missions would be possible in one year
The arm of a crane at a construction site is 14.4 m long, and it makes an angle of 40° with the horizontal. Assume that the upmost load the crane can handle is limited by the amount of torque the load produces at the base of the arm.
Explain how long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation change is 425 {rm m}?
If you were standing on a spinning turntable holding barbells close to your chest, how would your spin be affected? Why?
Consider a simple plane pendulum consisting of mass m attached to a string of length l. find the tension of the pendulum string
You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the empire state building. Before the state legislature votes on funding for the project.
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