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A 68.4-kg bungee jumper is standing on a tall platform (h0 = 45.4 m). The bungee cord has an unstrained length of L0 = 8.73 m and, when stretched, behaves like an ideal spring with a spring constant of k = 72.6 N/m. The jumper falls from rest, and it is assumed that the only forces acting on him are his weight and, for the latter part of the descent, the elastic force of the bungee cord. Determine how far the bungee jumper is from the water when he reaches the lowest point in his fall.
When you touch a friend after walking across a rug on a dry day, you typically draw a spark of about 2 mm. Estimate the potential diference between you and your friend before the spark
A long, solid insulating cylinder of radius R = 1 mm has a uniform volume charge density and a total linear charge density of lambda = 3.6X10^9 C/m. what is its speed just before it impacts the surface
A person pushes a 10 kg box from rest and accelerates it to a speed of 3.2 m/s with a constant force. what is the force exerted by the person
A protostar has a temperature of 3000 K,radius of 2*10^8 km at stage 4. At stage 6, Calculate the star's change in absolute magnitude as it evolves from stage 4 to stage 6
at the top of a 100m cliff a backpack is dropped. one second later an archer fires an arrow straight down that hits the backpack just as it reaches the ground, How long does it take for the backpack to reach the ground
A 2.18-m-long diving board of mass 13.2kg is 3.00m above the water. It has two attahcments holding it in place. Assuming that the board has a uniform density, find the force acting on each attachment
A reasonable estimate of the moment of inertia of an ice skater spinning with her arms at her sides can be made by modeling most of her body as a uniform cylinder. Estimate the skater's moment of inertia to two significant figures
A solid object of density 660 kg/m3 is placed in water. What will be the buoyant force on the object
The rms current in a 46-%u03A9 resistor is 0.34 A. What is the peak value of the voltage across this resistor
A child playing tee ball hits a stationary 65 {\rm g} ball with a 300 {\rm g} bat swinging initially at 4.0 {\rm m/s}. What's the bat's post-impact speed
The first controlled, sustained flight in a heavier-than-air craft was made by Orville Wright on December 17, 1903. The plane took off at the end of a rail that was 60 feet long, and landed 12 seconds later, 180 feet away from the beginning of the..
An office window has dimensions 3.5 m by 2.3 m. As a result of the passage of a storm, What net force pushes out on the window
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