Why did Copernicus hesitate to consider alternatives to the Ptolemaic Universe?
a. A heliocentric Universe contradicted Christian theology at the time
b. There was no way to prove uniform circular motion.
c. New star formation showed no parallax.
d. Most people already believed in a heliocentric Universe.
e. His mathematics could not disprove Ptolemy's epicycles, deferents and equants.
a
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A proton and electron, each travelling with the same velocity in the +x direction enter separate regions of uniform magnetic field in the +y direction (Bp for the proton, Be for the electron). They each experience the same acceleration. Hence we know
A. The magnetic fields were in the opposite direction and have ratio Bp/Be= mp/me B. The magnetic fields were in the opposite direction and have ratio Bp/Be= me/mp C. The magnetic fields were identical in magnitude and direction D. The magnetic fields were in the same direction and have ratio Bp/Be= me/mp E. The magnetic fields were in the same direction and have ratio Bp/Be= mp/me F. The magnetic fields were identical in magnitude and opposite in direction
What kinds of stars are being looked at to find these hiding bandits?
A: Stars with small parallaxes B: Stars with large parallaxes C: Stars with temperatures much greater than the Sun D: Stars with radii much greater than the Sun E: Stars with radii much smaller than the Sun
Which subatomic particle or particles is/are found in the nucleus of an atom?
A) protons and neutrons B) protons only C) neutrons and electrons D) electrons and protons
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 106 m, R = 5.0 × 106 m, and M = 4.0 × 1024 kg.
A. 7.8 km/s B. 3.5 km/s C. 5.4 km/s D. 6.9 km/s E. 4.8 km/s