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An elevator's cable snaps and its emergency brakes start gripping at the secondary line in order to slow its descent. The elevator and passengers weigh 336 kgs together and fall under the influence of gravity (9.81 m/s2). The coefficient of friction between the brakes and secondary line is 0.85, while the emergency brakes are designed such that the normal force on the line is equal to the weight of the elevator and passengers. How fast is the elevator going after falling 3 stories? (One story is precisely 4.50 meters)
Ship A is located 4.0 km north and 2.5 km east of ship B. Ship A has a velocity of 22 km/h toward the south, what is the least separation
A 140 kg piano is being lifted at a steady speed from ground level straight up to an apartment 16.0 m above the ground. The crane that is doing the lifting produces a steady power of 400W. Explain how much time does it take to lift the piano?
A boat takes 2.6 hrs. to travel 50 km down a river, then 5.6hrs to return. How fast is the river flowing
The highest recorded waterfall in the world is found at Angel Falls in Venezuela. Its longest single waterfall has a height of 807 m. what is the maximum temperature of the water
The gravitational acceleration on the surface of Mercury is 0.38 times that of Earth. What is the ratio of the density of Mars to that of Earth
A gymnast with mass m1 = 43 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 108 kg and length L = 5 m. Each support is 1/3 of the way from each end. at first the gymnast stands at the left end of..
Two small plastic spheres, one charged to -25 nC and the other to +25 nC , are connected by a 28-mm-long insulating rod. What is the maximum possible torque on the dipole
Find out the magnitude of the acceleration (in m/s2) for an alpha particle in a uniform electric field with a magnitude of 100 N/C
A space traveler weighs 550 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and evaluate whose mass is twice that of earth?
The first player has an acceleration whose magnitude is 0.5 m/s^2 and the second player's has an acceleration of 0.3 m/s^2. Explain by how much time passes before hey collide?
A transformer has 683 turns in its primary winding and 109 in its secondary winding. Assuming it has 100 percent efficiency, By what factor does it change the current
Consider an RLC circuit with R = 150? , L = 597mH , and C = 0.260?F, At what frequency is this circuit in resonance
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