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The elastic energy stored in your tendons can contribute up to 35 percent of your energy needs when running. Sports scientists have studied the change in length of the knee extensor tendon in sprinters and nonathletes. They find (on average) that the sprinters' tendons stretch 43 mm, while nonathletes' stretch only 33 mm . The spring constant for the tendon is the same for both groups, 33 N/mm . What is the difference in maximum stored energy between the sprinters and the nonathletes?
A tennis ball rolls off the edge of a tabletop of height 0.850m above the floor and strikes the floor at a point a horizontal distance 1.80 m from the edge of the table. You can ignore air resistance. Find out the time of flight.
The wire is cut at point P. Will the potential difference between points A and B increase, decrease, or remain the same? Give reason for.
A 250 kg weather rocket is loaded with 100kg of fuel and fired straight up. It accelerates upward at 32m/s2 for 34 s, then runs out of fuel. overlook any air resistance effects.
A 2.50 g bullet, traveling at a speed of 465 m/s, strikes the wooden block of a ballistic pendulum. The block has a mass of 275 g. What is the speed of the bullet/block combination immediately after collision.
How much would a 80.0 kg person weight on Mars, where the acceleration of gravity is 3.93 m/s^2, and on Earths Moon, where the acceleration of gravity is 1.63 m/s^2.
Three 1.2 kg masses are located at the vertices of an equilateral triangle 88 rm cm on a side, connected by rods of negligible mass. Find out the rotational inertia of this object.
An airplane is flying with a velocity of 90 at an angle of 22 above the horizontal. When the plane is a distance 122 directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
In 1975 the roof of Montreal's Velodrome, with a weight of 360 kN, was lifted by 10 cm so that it could be centered. How much work was done on the roof by the forces making the lift.
A mechanic pushes a 2.20 x10^3 kg car from rest to a speed of v, doing 5400 J of work in the process. During this time, the car moves 28.0 m. Neglecting friction between car and road, find each of the following.
Two test charges are located in the x-y plane. If q1 = -3.20 nC and is located at x = 0.00 m, y = 1.160 m and the second test charge has magnitude of q2 = 5.00 nC and is located at x = 1.00 m, y = 0.500 m, calculate the x and y components, Ex and ..
A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 210 mi/h in 3.00 s. (a) Find the average acceleration of the plane. m/s2 (b) Assuming the acceleration is constant, find the distance the plan..
What would be the final temperature of 100g of 16°C water when 107 g of 40°C iron nails are submerged in it? (The specific heat of iron is 0.12 cal/g °C. Here you must equate the heat gained by the water to the heat lost by the nails.)
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