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A student is performing an experiment with two identical small metal balls, A and B.Initially, ball A contains 6.0-?C net charge with unknown sign and ball B is neutral. The student brings them in contact and then separated them by 20 cm. Both of the balls are remain isolated. (a) Is the electric force between A and B attractive, repulsive or zero? (b) What is the magnitude of the electric force between the balls?
Megan's mass is 27 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 3.6 m/s at the bottom of the slide. How much work was completed by friction on Megan? Imagine that air resistance is negligible.
Suppose that you are traveling on board a spacecraft that is moving with respect to the earth at a speed of 0.976c. what is your breathing rate
A 10.5-cm-long solenoid contains 855 turns and carries a current of 4.59 A. What is the strength of the magnetic field at the center of this solenoid?
As part of the safety investigation, two 1400 {rm kg} cars travelling at 23 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.7 {rm s} to stop, and (b) car that hits..
A 8.0 W laser beam shines on an ensemble of 10^24 electrons, each in the ground state of a one-dimensional infinite square well 0.80nm wide. How many electrons can be so excited if the beam shines for 15 ms
A cannon ball is fired horizontally with a velocity of 600 m/s from the top of a cliff 1000 m high.
A woman stands in an elevator that has a constant upwardacceleration while the elevator travels upward a distance of18.0 m. What is the acceleration of the elevator
A light bulb is connected to a 120 V wall socket. The current in the bulb depends on the time t according to the relation I = (1.414 A) sin[ (125.6 Hz) t ]. What is the average power delivered to the light bulb
A 80.0 box contains helium at a pressure of 1.50and a temperature of 110. What is the final thermal energy of each gas
What is the IMA of the jack.
At a dock, a crane lifts a 1200 kg container 30 m, swings it out over the deck of a frieghter, and lowers the container into the hold of the freighter, which is 10 m below the level of the dock. The acceleration of gravity is 9.8 m/s2. Neglect fri..
Physicians perform needle biopsies to sample tissue from internal organs. A spring-loaded gun shoots a hollow needle into the tissue; extracting the needle brings out the tissue core. Find the impulse imparted by the tissue
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