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A steel cable supports an elevator weighing 1800 lb. Starting from rest, the elevator reaches a velocity of 10 ft/s upward in 2.5 sec. Find the tension in the cable at the 2.5-sec mark, if the same force is continued? If the cable breaks at the 4-sec mark, compute how long will it take the elevator to fall back to the surface, if it were 75 feet above it when the cable broke?
An element in its solid phase forms a cubic crystal lattice with mass density 7950 kg/m^3. What is the element's atomic mass number
You would like to shoot an orange out of a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. how far away can you stand to hit the orange
An ocianliner is heading due north with a speed of 8.5 m/srelative to the water. A small sailboat is heading 45 degreeseast of north with a speed of 1.0 m/s relative to thewater. Determine the directional angle relative to due north
The 20-g centrifuge at NASA's Ames Research Center in Mountain View, Determine the rotation rate, in revolutions per second, required to give the astronaut a centripetal acceleration of 19.8g
antireflection coatings can be used on the inner surfaces of eyeglasses to reduce the reflection of stray light into
a rocket-powered hockey puck has a thrust of 2.70 n and a total mass of 2.30 kg. it is released from rest on a
You are provided with a 1 cm3 of biological sample from which 0.1 mm thin sections are cut. A search for virus cells at a magnification of 100,000 has been proposed. The fluorescent screen on which the image is to be projected has a diameter of 15 cm..
A rock of mass 32kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 274N. What is the magnitude of the acceleration of the rock.
in the simulation above the length and orientation of the blue and yellow vectors can be changed by dragging the tips
A cat is stuck in a tree. You are designated with the job to get it out, yet you do not want to climb the tree, because you may get stuck as well. Instead you set up a pulley system. A rope (consider it massless) runs from the seat you sit on over..
A spacecraft is in orbit around a planet. The radius of the orbit is 3.2 times the radius of the planet (which is R = 71466 km). What is the period of the spacecraft's orbit
The plumbing in an old house uses lead pipes (which are now considered hazardous). what is the change in the length of the pipe
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