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Firemen are shooting a stream of water at a burning building. A high-pressure hose shoots out the water with a speed of 23.0m/s as it leaves the hose nozzle. Once it leaves the hose, the water moves in projectile motion. The firemen adjust the angle of elevation of the hose until the water takes 3.10s to reach a building 37.0m away. You can ignore air resistance; assume that the end of the hose is at ground level.
Find the angle of elevation of the hose.
Find the speed of the water at the highest point in its trajectory.
Find the acceleration of the water at the highest point in its trajectory.
How high above the ground does the water strike the building?
How fast is it moving just before it hits the building?
A rope applies a horizontal force of 180N to pull a crate a distance of 2m across the floor A frictional force of 60N opposes this motion.
Select ALL the valid statements, i.e., B, AC, BCD. If an equation is dimensionally A) correct, the equation may be correct. B) incorrect, the equation may be correct. C) correct, the equation may be wrong. D) incorrect, the equation must be wrong...
Imagine two Einstein solids in thermal contact. A has 300 atoms and B has 200 atoms, and qtotal = 100, how many macrostates are there
A female gymnast weighs 620 N. If she is hanging stationary from a high bar, how many forces are acting on her.
An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is ? = 1.90 10-7 C/m2, and the plates are separated by a distance of 1.5 10-2 m. How fast is the electron moving just bef..
Hydraulic engineers often use, as a unit of volume of water, the "acre-foot", defined as the volume of water that will cover 1 acre of land to a depth of 1 ft. A severe thunderstorm dumps 3.0 in. of rain in 30 min on a town of area 30 km2. What vo..
Illustrate what is the frictional force acting on the disk? The disk will slide off the turntable if it is located at a radius larger than 16 cm from the axis of rotation. What is the coefficient of static friction?
What is coefficient of kinetic friction
When these waves move into a shallower part of the lake, their speed decreases to 1.6 m/s, though their frequency remains the same. Find out the wavelength of the waves in the shallower water.
The position of a particle in cm is given by x = (7) cos 9?t, where t is in seconds, What is the frequency, What is the period, What is the amplitude of the particle's motion
An object with a charge of 0.880 µC is placed at the center of a regular icosahedron with 20 equivalent surfaces. What is the electric flux through one surface of the icosahedron?
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box, determine acceleration of the box
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