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A 2000 kg car is traveling at 20.0 m/s and then puts on the brakes and comes to a complete stop. The heat generated at the brakes due to stopping heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg °C. What is the increase in the temperature of the brakes?
a) 18.9°C
b) 75.3°C
c) 53.1°C
d) 23.9°C
e) 12.4°C
The figure shows two 22.7 kg ice luges that are at rest and placed a short distance apart, one directly behind the other. What are the final speeds of the first luge
You're the operator of a 1.20×104 V rms, 60 Hz electrical substation. When you get to work one day, What is the rms current leaving the station
A person undergoing radiation treatment for a cancerous growth receives an absorbed dose of 1.8 Gy. All the radiation is absorbed by the gowth. Determine the rise in temperature
Jupiter has mass M, radius R and orbital period T, while the Sun has mass m, radius r and orbital period t. Calculate the ratio of the centrifugal acceleration to the gravitational acceleration at the equator of
Consider a thin ring of radius a with uniform charge density and total charge Q. The ring is cut in half across the diameter and the two halves superimposed to double the effective charge density. Calculate the electric field at a point 4a from the r..
You are holding a conducting loop of copper and looking at its circle. Behind it is a long current-carrying wire carrying the current from left to right. what is the direction of current flow if any
A microphone is located on the line connecting two speakers that are 0.514 m apart and oscillating 180° out of phase. What is the next highest frequency that produces an interference maximum at the microphone's location
In a single-slit diffraction experiment, a beam of monochromatic light of wavelength 630 nm is incident on a slit of width 0.400 mm. If the distance between the slit and the screen is 1.80 m, what are the positions of the first dark fringes?
A solar cell generates a potential difference of 0.400 V when a 150.0 ? resistor is connected across it, What is the emf of the cell
two charges e and -e are a distance of 0.620 nm apart in an electric field e that has a magnitude of 3.55 knc and is
It's generally okay to ignore relativistic effects when a particle's speed is less than 1.0% of the speed of light, Find the accelerating potential difference that will bring electrons to that speed, starting from rest
Assume an asteroid has the shape of a sphere. A rock sitting on the surface of the asteroid has a weight of 100 newtons. What would the weight of this rock be if it were moved to a distance above the surface equal to the radius of the asteroid? How i..
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