Which of the following statements about Kepler's laws is false?
A) Kepler's laws provide mathematical descriptions of the motion of the planets.
B) Kepler's first law states that planetary orbits are shaped as ellipses.
C) Kepler's second law implies that when planets are closer to the sun, they move faster.
D) Kepler's laws explain why planets with larger semi-major axes have much longer orbital periods.
D
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A thin ribbon of a silver alloy 2.00-cm wide and 0.015 0-mm thick carries a current of 6.98 A perpendicular to a magnetic field. The Hall voltage is found to be 1.24 × 10^?4 V when the magnetic field is 2.50 T. Calculate n, the number of charge carriers per cubic meter
Determine the charge on each balloon using the electroscope when it has been charged positively. (Hint: Do the leaves spread farther apart or collapse when the charged object is brought near the electroscope knob?)
An electron has a kinetic energy that is twice its rest energy. Determine its speed.
A. 0.76c B. 0.81c C. 0.94c D. 0.54c E. 0.87c
Latent Heats: A 2294-kg sample of water at 0° C is cooled to -36°C, and freezes in the process. How much heat is liberated? For water LF = 334,000 J/kg and LV = 2.256 × 106 J/kg. The specific heat of ice is 2050 J/kg ? K.
A. 935,000 kJ B. 597,000 kJ C. 1,110,000 kJ D. 334,000 kJ