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A firefighter mounts the nozzle of his fire hose a distance 30.5 m away from the edge of a burning building so that it sprays from ground level at a 45° angle above the horizontal. After quenching a hotspot at a height of 9.45 m, the firefighter adjusts the nozzle diameter so that the water hits the building at a height of 18.7 m. By what factor was the nozzle diameter changed? Assume that the diameter of the hose stays the same, and treat the water as an ideal fluid.
In heavy rush-hour traffic you drive in a straight line at 12 m/s for 1.5 minutes, then you have to stop for 3.5 minutes, and finally you drive at 15 m/s for another 2.5 minutes. compute the average velocity between t=0 and t=7.5 minutes.
Given a pair of forces, one with magnitude 27.3 N at an angle of 24 degrees clockwise from the +x direction and the other with magnitude 15.7 N exactly in the +x direction: Find the direction of the acceleration
In a Young's double slit experiment the 10th order dark fringe is located 0.025 m to the side of the central bright fringe on a flat screen. How far away is the screen from the double slit
Two wheels have the same mass and radius of 4.3 kg and 0.52 m, respectively. Find the net external torque that acts on each wheel
A projectile is fired in such a way that its horizontal range is equal to 14 times its maximum height. What is the angle of projection
A bat hits a moving baseball. If the bat delivers a net eastward impulse of 0.8 N-s and the ball starts with an initial horizontal velocity of 5.0 m/s to the west, what is the mass of the ball
A weather balloon rises by the atmosphere, its volume expanding from 4.4m^3 to 10m^3 as temperature drops from 17 Degrees C to -13Degrees C.
Compare these two ratings by determining the ratio of energy.
A container with a one-liter capacity at 27°C is filled with helium to a pressure of 2 atm. (1 atm = 1.0x10^5 N/m^2.) How many moles of helium does it hold
In a single-slit diffraction pattern produced by electromagnetic radiation from a distant source passing through a slit of width a, What is the wavelength of the electromagnetic radiation
A 1.00 liter bubble of air at the bottom of the Marianas Trench has an inital temperature of about 0C. what is the volume of the bubble as it breaks the surface
you are on a standard elavator . you are holding a fishing rod with a fish you just caught on the fishing line .the fish has a mass of 4kg. how much tension is in the fishing line
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