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A firehose 15 m long is uncoiled by pulling the nozzle end horizontally along a frictionless surface at the steady speed of 2.9 m/s. The mass of 1 m of the hose is 0.25 kg. How much work has been done on the hose by the applied force when the entire hose is moving?
How much horizontal force should a sprinter of mass 57.0 exert on the starting blocks to produce this acceleration.
A small statue has a height of 3.4 cm and is placed in front of a concave mirror. Find the focal length of the mirror
Assuming the train has an average speed during a trip from the train stop to the airport of 250[km=hr], how long will it take to make the trip [minutes]. Assuming the train can accelerate to its fastest speed in 5[s]
A red laser from the physics lab is marked as producing 632.8-nm light. When light from this laser falls on two closely spaced slits, What is the wavelength of light produced by the pointer
A 24-V battery is connected in series with a resistor and an inductor, with R = 3.8 ? and L = 7.2 H, respectively. Find the energy stored in the inductor when the current reaches its maximum value
A 1.65 kg bowling trophy is held at arm's length, a distance of 0.68 m from the shoulder joint. What is the magnitude of the torque applied by the trophy
q1. a pipe open only at one end has a fundamental frequency of 241 hz. a second pipe initially identical to the first
You are standing on the Royal Gorge Bridge, which is 284 meters from the water below. You throw a baseball straight up at 40 miles per hour. how long does it take to hit the water
When she gets off the ride, she uploads the scale readings to a computer and creates a graph of scale reading versus time. Note that graph has a minimum value of 519 rm N and a maximum value of 666 rm N.
Imagine that Earth is struck by a meteor with a mass of 5.23 x 1015 kg, and a speed of 8100 m/s. What speed would such a meteor give Earth in a head-on collision
What is the apparent weight of a cube of iron of volume 0.2 m3 when it is submerged in water? The density of iron is 7800 kg/m3
A train slows from 40m/s to 10m/s in 3 seconds . If its mass is 50000kg what was the change in momentum? What was the train's impulse
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