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Two identical dust particles of mass 1.00mg are floating in empty space, far from any external sources of large gravitational or electric feilds, and at rest with respect to each other. Both particles carry electric charges that are identical in maggnitude and sign. the gravitational and electric forces between the particles happen to have the same magnitude, so each particle experiences zero net force and the distance between the particles remains constant.
During normal operation, a computer's hard disk spins at 7200 rpm. what is the average angular acceleration of the hard disk
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
How long will it take a 1,000W electric plate to bring 0.5kg of water to boil from a temperature of 20 degrees celcius? Assume all of the heat produced by the electric plate goes into heating the water.
A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 600 N. Determine the weight of the person
A rotating wheel requires 6.00 s to rotate 30.0 revolutions. What is the constant angular acceleration (in rad/s) of the wheel
Objective questions based on work, energy, power.
a toy car of mass 2.0 kg moving to the right with a speed of 8.0 ms collides perfectly in elastically with another toy
As a baseball is being thrown, it goes from 0.0 to 40.0 m/s in 0.17 s. What is the acceleration of the baseball
A large positively-charged object with charge q = 3.75 ?C is brought near a negatively-charged plastic ball suspended from a string of negligible mass. what is the angle the string makes with the vertical
A battleship is using sonar (reflected underwater sound signals) to detect the presence of nearby submarines. How far away from the battleship is the submarine
It's possible to estimate the percentage of fat in the body by measuring the resistance of the upper leg rather than the upper arm; the calculation is similar. What are the fractions of muscle and fat in the leg
A bullet is fired with a certain velocity at an angle above the horizontal at a location where g=10.0m/s^2. How long does it take before the bullet hits the ground
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