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An engineer claims to have a new kind of "safety" air-brake for elevators. If the cable should snap, a patented velocity-sensor turns on the brakes once the elevator hits 40 mph. The brakes are powerful enough to stop a 700 lb elevator in 1/20 of a second.How much force do the brakes exert to stop the elevator like this? Why isn't the answer 700 lbs? Isn't the force of gravity only 700 lbs? What about the scheme itself: is it a good idea? Should you buy stock in this company?
What is the third fragment right after the explosion
The coefficient of kinetic friction between her skis and the snow.
A displacement vector at an angle of 150 degrees (counter clockwise) from the x axis has a y component equal to 123 meters
Blocks with masses of 2.0 kg , 3kg , and 6.0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 53 N force applied to the 2kg block.
A car is driving 22.7m/s flat ground drives off 42.3 m high cliff. How much time does it take to reach the ground.
A house at the bottom of a hill is fed by a full tank of water 6.0 m deep and connected to the house by a pipe that is L = 83m long at an angle of ? = 67? from the horizontal. Determine the water gauge pressure at the house
What tension is necessary to tune string properly
A Simple Harmonic Oscillator consisting of a 305 g mass and a spring is set oscillating on a smooth flat surface. If the greatest speed of the mass is 1.50 m/s and the spring constant of the spring is 2.00 N/m.
Suppose you are on Mars, where the free-fall acceleration is just 3.7 m/s^2. How far can you hit a golf ball with your club from a 300 meter elevated cliff, How long will the ball fly before hitting the ground
A pyramid with horixontal square base, 5.5 m on each side, Calculate the total electric flux through the pyramid four slanted surfaces
A spaceship travels past an observer at a speed of 0.6c. What time would the observer record for the same event
A 5.080 kg block of wood rests on a steel desk, State the force of friction applied to the block by the table at the following times: t=0 and t>0
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