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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.
Three astronauts, propelled by jet backpacks, push and guide a 115 kg asteroid toward the processing dock, exerting the forces, with F1 = 34 N, F2 = 57 N, F3 = 41 N, θ1 = 30°, and θ3 = 60°
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.050 s, Determine the horizontal and vertical components of the launch velocity
The horse on a carousel is 3.7m from the central axis. How fast is a child on the horse going
If a person hike 5 km north, 4 km to the east, 3 km to the north, 2km to the west, and 4 km to the south. What is the the distance the hiker traveled
A playground carousel is free to rotate about its center on frictionless bearings, and air resistance is negligible. What is the person's mass
A meter stick weighing 150 g sits on two knife edges, one at the 20 cm mark the other at the 90 cm mark. What is the total upward normal force (in N) exerted by both knife edges?
A hospital's linear accelerator produces electron beams for cancer treatment. The accelerator is 1.4m long and the electrons reach a speed of 0.98c.
The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. what must be the focal length of the eyepiece
An electron enters a region of space containing a uniform 0.0000201-T magnetic field. Find the radius of the electrons path, and the frequency of the motion
For red light (lamda = 0.64um), ni in pure water is approx 1.3 x 10^-8; for blue light (lamda = 0.48um), ni is approx 1.0x10^-9. The deep end of a typical home swimming pool is approx 2.5m deep.
A string that is fixed at both ends has a length of 1.61 m. When the string vibrates at a frequency of 92.8 Hz, What is the fundamental frequency of the string
A spherical mirror is to be used to form an image, five times as tall as an object, on a screen positioned 4.2 m from the mirror. Describe the type of mirror required
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