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The boom of a fire truck raises a fireman (and his equipment - total weight 280 lbf) 60 ft into the air to fight a building fire. (a) showing all of your work and using unity conversion ratios, calculate the work done by the boom on the fireman in units of Btu. (b) if the useful power supplied by the boom to lift the fireman is 3.50 hp, estimate how long it takes to lift the fireman.
Two ants race across a table 62 cm long. One travels at 4.77 cm/s and the other at 2 cm/s. When the first one crosses the finish line, how far behind is second one. What am I trying to solve for distance, speed, or time.
if 1.0 m3 of concrete weighs 4.5 104 n what is the height of the tallest cylindrical concrete pillar that will not
A walkway suspended across a hotel lobby is supported at numerous points along its edges by a vertical cable above each point and a vertical column underneath. how much does the point move down
Suppose the magnitude of the gravitational force between two spherical objects is 2000 when they are 100 apart. find the magnitude of the gravitational force between the objects
A baseball player stealing second base runs at 7.8 m/s. If he slides the last 3.6 m, slowing to a stop at the base, what's the coefficient of kinetic friction between player and ground
A person weighs 689 N and the head is 53 N the average density of the person is 1010 kg/cubed meters how much force in N is required to keep a persons head out of the water.
A camera is focused on a group of people 3 m from the lens, wjocj jas a focal lenght of 50 mm = 0.05 m. What is the lens-to-film distance
A 5.00 x 10^4 kg space probe is travelling at a speed of 14000 m/s through deep space. Retrorockets are fired along the line of motion to decrease the probe's speed. The retrorockets generate a force of 4.00 x 10^5 N over a distance of 2600 km. What ..
A 50 g Super Ball travelling at 28 m/s bounces off a brick wall and rebounds at 18 m/s. A high-speed camera records this event. If the ball is in contact with wall for 5 ms, what is the magnitude of the average acceleration of the ball throughout ..
What is corresponding free energy change
This procedure has actually been used to "weigh" astronauts in space. A 42.5- chair is attached to a spring and allowed to oscillate. What is the mass of the person
A professor's office door is 0.89m wide, 2.0m high, and 4.0cm thick; has a mass of 25kg ; and pivots on frictionless hinges. When the door is open and at rest, the door closer exerts a torque of 4.5N?m
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