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A 400kg baby grand piano is raised to the roof of a 100m building. If the cable breaks as it reaches this height, what will its velocity be the instant prior to impact? Use energy considerations and verify using kinematics. I know the answer is 44.27 but I need to see it done step by step.
A turntable must spin at 33.5 rpm (3.51 rad/s) to play an old-fashioned vinyl record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 1.0 revolutions, starting from rest
A golf club striking a golf ball imparts a force of2100N over a time of 5.06×10?3s at an angle of 35.0? above the horizontal. What maximum height does the golf ball achieve after impact
A man slides along a long water slide and then being launched into the air to land in a water pool. Find the magnitude of the velocity at landing
A rubber ball (150g) confined to move in the x direction, bounces elastically back and forth at 9m/s between two walls, Calculate the average pressure on this wall
Does current through a power supply increase when parallel bulbs are added? For example, if you have a circuit with one bulb and measure the current through the bulb to be 100 mA, what is the current through the power source when you add another b..
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 54.35 diopters, what is the height of the image on her retina
Two forces, of magnitude F1 = 80.0 N and F2 = 45.0 N, act in opposite directions on a block which sits atop a frictionless surface. Find the work W1 done on the block by the force of magnitude F1= 80.0 N as the block moves from xi = -1.00 cm to xf =..
A car is traveling around a horizontal circular track with radius r = 150 m at a constant speed v = 28 m/s as shown, What is the magnitude of the car's acceleration, What is the x component of the car's acceleration when it is at point A
You can exert a total of 75 J to launch a 0.75 kg projectile up a 5 m long ramp. What is the total distance (in m) traveled by the projectile
For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. determine the recoil velocity
A portable x-ray unit has a step-up transsformer, the 120 V input of which is transformed to the 100kV output needed by the x-ray tubr, what is the number of loops in the secondary
In a typical game of squash, two people hit a soft rubber ball at a wall until they are about to drop due to dehydration and exhaustion.
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