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A firefighter directs a horizontal stream of water toward a fire at an angle of 40° measured from the horizontal.
The fire hydrant and hose deliver 91 gallons per minute (1 gal/min = 6.31 cross 10-5 m3/s), and the nozzle projects the water with a speed of 7.3 m/s.
How much horizontal force must the firefighter exert on the hose to keep it stationary?
A race car starts from rest on a circular track of radius 690 meter. The car's speed increases at the constant rate of 0.400 m/s2, estimate the elapsed time
A 58-kg water skier is being pulled by a nylon tow rope that is attached to a boat. What is the change in the length of the rope when the skier has an acceleration whose magnitude is 0.90 m/s2
the second person is initially at rest. Illustrate what are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice.
a pendulum clock can be approximated as a simple pendulum of length 1.48 m and keeps accurate time at a location where
A long, straight wire carries a current of 200 mA. Obtain the magnitude of the magnetic field 0.012 centimeter from the wire
a supply plane flies at 55ms and has a constant height of 250m towards a point directly above a victim where a crate is
The minimum stopping distance for a car traveling at a speed of 30 {m/s} is 60 {m}, including the distance traveled during the driver's reaction time of 0.50 {s}.What is the least stopping distance for the same car traveling at a speed of 41 {m/s}..
Water flows trough a normal garden hose at 2 m/s. If a nozzle at the end of the hose reduces the cross sectional area to 5% of its original value, how fast does the water emerge from the hose nozzle
suppose that a block sliding with positive velocity v on a horizontal surface experiences a drag force fv-f0ekv where
snowballs are thrown with a speed of 18 ms from a roof 9.0 m above the ground. snowball a is thrown straight downward
The intensity of the sunlight that reaches Earth's upper atmosphere is approximately 1410 W/m2. What is the average energy density
Light rays in a material with index of refrection 1.25 can undergo total internal reflection, Find this material's index of refraction when the required critical angle is 67.9°
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