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The elastic energy stored in your tendons can contribute up to 35% 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 40mm , while nonathletes' stretch only 31mm. 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 baseball pitcher throws a fastball at a speed of 45.00m/s. The acceleration occurs as the pitcher holds the ball in his hand and moves it throughout an almost straight-line distance of 4.0 m. compute the acceleration; assume that it is constant ..
A toy cannon uses a spring to project a 5.28 g soft rubber ball. The spring is originally compressed by 5.06 cm and has a force constant of 8.08 N/m. At what point does the ball have maximum speed
A rms AC voltage of 118 V at 60 Hz is applied to an RLC circuit with 11.8 mH inductor, 0.171 µF capacitor, and 43.1 ? resistor in series. What is the power consumed in the circuit
A package is dropped out of a helicopter, which is moving upward at 10m/s at a constant rate. how high above the ground was the package when it was dropped
A 630-Hz sound travels through pure hydrogen. What is the speed of sound in hydrogen
In preparation for a demonstration on conservation of energy, a professor attaches a 7.2-kg bowling ball to a 2.9-m-long rope. Find the force the professor is exerting on the ball
question1a current experiment demonstrated diffraction of phthalocyanine molecules 514.54 gmol. the molecules have a
A tank holds a layer of oil, 1.65 m thick, which floats on a layer of syrup that is 0.83 m thick. Both liquids are clear and do not intermix. A ray, The index of refraction of the syrup is
A system gains 1700 J of heat, while the internal energy of the system increases by 6650 J and the volume decreases by 0.00943 m3. Assume the pressure is constant and find its value.
A basketball player makes a jump shot. The 0.600 kg ball is released at a height of 2.00 m above the floor with a speed of 7.20 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.20 m/s Find the work done on the ball by air ..
A halfback is initially running south at a speed of 9.90 m/s, quickly cuts to his right, and 0.505 s later is running 60.0° west of south at 9.10 m/s
A physical pendulum consists of a meter stick (of mass 0.3 kg) that is pivoted at a small hole drilled through the stick a distance x from the 50 cm mark. The meter stick is then released from rest (at a small angle from vertical) and allowed to o..
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