If it takes 50 J of energy to move 10 C of charge from point A to point B, what is the magnitude of the potential difference between points A and B?
A) 500 V B) 5.0 V C) 50 V D) 0.50 V
B
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Circular Motion of Charges: Alpha particles, each having a charge of +2e and a mass of 6.64 ×10-27 kg, are accelerated in a uniform 0.80-T magnetic field to a final orbit radius of 0.30 m. The field is perpendicular to the velocity of the particles. How long does it take an alpha particle to make one complete circle in the final orbit? (e = 1.60 × 10-19 C)
A. 0.15 ?s B. 0.25 ?s C. 0.33 ?s D. 0.40 ?s E. 0.49 ?s
Heat Engines: During each cycle, a heat engine takes in 4.0 J of heat, does 1.0 J of work, and expels 3.0 J of heat. What is its efficiency?
Fill in the blank(s) with the appropriate word(s).
Why can one not use quasars to check the Hubble relation relating distances of objects to their velocity of recession?
What will be an ideal response?
What was one of the first observations that hinted at limitations in Newton's theory of gravity?
A) deviations in the motion of the planet Uranus in the sky B) deviations in the motion of the planet Mercury in the sky C) shifts in position of stars close to the Sun during solar eclipses D) failure to explain why all objects fall at the same rate in a gravitational field