To recharge a 12-V battery, a battery charger must move 3.6 × 10^5 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?
4.3 MJ, 1.2 kWh
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True or False: If you were traveling in a spaceship at a speed of c/2 relative to Earth and you fired a laser beam in the direction of the spaceship’s motion, the light from the laser would travel at a speed of 3c/2 relative to Earth
1.False 2.True
Why does the observation that all distant galaxies are moving away from Earth not violate the Cosmological Principle?
A. Any other galaxy in the Universe will also see the Universe expanding in the same way. B. The motion of galaxies relative to Earth has nothing to do with the Cosmological Principle. C. The night sky is still dark. D. It does violate the Cosmological Principle but for only the location of Earth.
When an electron collides with a positron the two particles
A) fuse to form a heavier particle B) bounce off each other C) are destroyed, producing a pair of high-energy gamma rays D) are destroyed, producing another pair of particles
When a ?- particle is emitted from an unstable nucleus, the atomic mass number of the nucleus
A) increases by 1. B) decreases by 1. C) increases by 2. D) decreases by 2. E) does not change.