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A 821 kg car is going 29 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 horizontal string of length 1.5 meters vibrates with a wave velocity of 1230 m/s at its fundamental frequency.
An airplane with a speed of 87.7 m/s is climbing upward at an angle of 35.1 ° with respect to the horizontal. determine the angle of the velocity vector of the package
In an aluminum pot, 0.15 kg of water at 100 degrees c boils away in four minutes. find the temperature at the aluminum-steel interface
The work function for Tin is 4.42 eV. Ultraviolet light with \lambda =50 nm is shone upon a Tin electrode
A 3.00-kHz tone is being produced by a speaker with a diameter of 0.160 m. find the change in the diffraction angle
A certain type of laser emits light that has a frequency of 5.2 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.7 x 10-11 s. How many wavelengths are there in one pulse.
A person is 1.4 m tall, and is standing at 2.0 m in front of a plane mirror. What is the minimum length of the mirror if the person is now 3.5 m from the mirror
A professor's office door is 0.90 wide, 2.00 high, 4.00 thick; has a mass of 30, and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts the torqu..
A wrecking yard inventor wants to pick up cars by charging a 0.400 m diameter ball and inducing an equal and opposite charge on the car. If a car has a 1000 kg mass and the ball is to be able to lift it from a distance of 1.00 m: (a) What minimum ..
An ion harvester is scouring deep space for isolated xenon (Xe+) ions. A xenon ion is singly ionized and has the charge of +e. If the field meter reads 0.000000202 N/C, how far away is it from the ion.
A ladder 5.6 m long leans against a wall inside a spaceship. From the point of view of a person on the ship, Find the angle the ladder makes with the floor
Suppose that a plane is flying due west with an airspeed of 222 km/h. What is the magnitude of the wind velocity
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