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Water flows over a section of Niagara Falls at the rate of12.9 x10e6 kg/s and falls 54m. How much power is generated bythe falling water?
a student is moving a safe onto a platform. the student needs to push the safe 2.3 m horizontally and then lift it 1.2
Suppose that when a certain sound intensity level (in dB) quadruples, the sound intensity (in W/m2) doubles. Determine this sound intensity level
A rocket blasts off from a platform on a space station. An identical rocket blast off from free space. Considering that everything else is equal, will the two rockets have the same acceleration? define.
Identify the equation below which is dimensionally incorrect. A, x, y and r have units of length. k here has units of inverse length. vo and v have units of velocity. a and g have units of acceleration. w has units of inverse time.
Find the average force on the driver if the deceleration is accomplished gradually by the application of brakes over a 11.1 s interval
mug down the counter for a refill. The height of the counter is h. The mug slides off the counter and strikes the floor at distance d from the base of the counter. With what velocity did the mug leave the counter
You're riding on a cart, carrying a box, moving at an initial speed of vi. You throw the box off the cart such that it lands at rest, what will be the final speed of the cart
The intensity due to a number of different sources is the sum of the individual intensities. how many additional babies would be required
A 59kg woman trips while walking down the street. She stumbles forward and falls onto her outstretched right hand. At the instant her hand contacts the ground her whole body is moving downward at a velocity of 9m/s and has a downward acceleration ..
A meter stick supported at the 50 cm mark has masses of 300 g & 200 g hanging from it at the 10-cm & 60-cm mark, respectively. Where should we hang a third, 400-g mass to keep the meter stick balanced?
A damped mass-spring system oscillates at 275-Hz. The time constant of the system is 2.0 s. At t = 0, the amplitude of oscillation is 3.20cm and the energy of the oscillating system is then 32 J.
q1. consider a motor that exerts the constant torque of 25.0 n cdot m to a horizontal platform whose moment of inertia
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