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A uniform 300-N trapdoor in a ceiling is hingedat one side.
a) Find the net upward force needed to begin toopen it, if the upward force is applied at the center.
b) Find the total force exerted on the door bythe hinges, if the upward force is applied at the center.
c) Find the net upward force needed to begin toopen it, if the upward force is applied at the center of the edgeopposite the hinges.
d) Find the total force exerted on the door bythe hinges, if the upward force is applied at the center of theedge opposite the hinges.
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. Find the time it takes for the ball to fall from rest all the way to the ground
A 162 Ω resistor is connected to a variable power supply. What voltage will be required for a current of 0.6 A to flow in the resistor
A Van de Graaff accelerator is essentially a parallel plate capacitor. Such a machine is changed by an electrical potential of 2.5 x 10^6 volts. What is the energy density stored in the field
A weight of unknown mass is suspended from a steel wire that is 1.27 m long and has a diameter of 0.56 mm; Find the mass of the weight
A3.50-kg block starts from rest at the top of a 30.0° incline and slides a distance of1.90m down the incline in1.80s. Find the magnitude of the acceleration of the block
A spacecraft with a proper length of 250 m passes by an observer on the Earth. According to this observer, it takes 0.780 µs for the spacecraft to pass a fixed point. Determine the speed of the spacecraft as measured by the Earth-based observer. c
An old oaken bucket of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, How much work does gravity do on the bucket
In a pool game, the cue ball, which has an initial speed of 8 m/s, make an elastic collision with the eight ball, which is initially at rest. Find the direction of motion of the cue ball after the collision
An airplane flies 200 km due west from city A to city B and after that 295 km in the direction of 26.5° north of west from city B to city C.
A man with a mass of 71.3 kg stands up in a 61-kg canoe of length 4.00 m floating on water. How far does the canoe move
A 1350 kg cannon, which fires a 70 kg shell with a speed of 606 m/s relative to the muzzle, At what angle with the ground is the shell projected
Compute the expected sea level rise for the projected 4°C mean global temperature rise anticipated by 2100. The average depth of the ocean is 3790 m, but you will not consider this whole depth to be expanding. Instead you will only consider the ex..
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