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A 818 kg car is going 28 m/s and the driver has to slam on his brakes to prevent an accident. Assume that a total of 23.4 kg of iron in the brake pads and rotors absorb the heat produced by the friction between the brake pads and rotors. After the car has stopped, what is the change in temperature of the brake pads and rotors?
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 17.0 m/s. With what speed and angle of impact does the stone land
A playground carousel ("merry-go-round") is free to rotate frictionlessly in the horizontal plane (and air resistance is negligible). Find the person's mass
You are traveling in a car toward a hill at a speed of 36.4 mph. The car's horn emits sound waves of frequency 231 Hz, Determine the frequency with which the waves strike the hill
The Hale Telescope The 200-inch-diameter concave mirror of the Hale telescope on Mount Palomar has a focal length of 16.9, What is the magnification of her image
Two charges of +0.250 C are placed at the points (1.25 mm, 0) and (-1.25 mm, 0). A third charge of -0.450 C is placed at the origin. a. What is the electric field at the point (0, 2.20 mm)? b. At what point on the y-axis will E be zero? Show graph..
The student throws a ball into the air along a path that he judges to make an initial angle of 59° with the horizontal and to be in line with the track. The student's professor, who is standing on the ground nearby, observes ball to rise verticall..
As the police car approaches a brick wall it emits a sound at 800Hz. The speed of the car is 100km/h. Find the beat frequency recorded by the driver of the police car
Puffy cumulus clouds, which are made of water droplets, occur at lower altitudes in the atmosphere. Find the altitude y (measured from sea level) above which wispy cirrus clouds can occur.
A starship has a mass of 8,500kg. It is moved by Yoda, 3.2m vertically upward and 14.8m horizontally toward Yoda, Determine the amount of force used to lift the ship
When a single person shouts at a football game, the sound intensity level at the center of the field is 59.9dB. how many people are at the game
A long thin rod lies along the x-axis. One end is at x=2.00 m and the other at x=4.00 m. Calculate mass of the rod
An airline passenger dangles her watch from a string while the jet takes off. The string makes an angle of 25o with respect to the vertical while the aircraft accelerates for takeoff, which takes about 18 seconds. Determine the takeoff speed of the a..
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