What evidence do we have that the center of our galaxy contains magnetic fields?
What will be an ideal response?
Peculiar features such as threads, the Arc, and the Snake may be gas trapped in magnetic fields.
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Planetary transits of exoplanets are rare because
A) most stars are too bright for us to detect a planetary transit. B) the Earth's atmosphere interferes with our observations of transits. C) our telescopes are not powerful enough to detect them. D) most extrasolar systems are not seen edge-on. E) most exoplanets are smaller than Pluto.
A photon is
A) a high-energy electromagnetic wave. B) an electron that has been ejected from a metal surface by electromagnetic radiation. C) a particle-like quantum of radiation. D) one of the two types of nuclear particles. E) the "anti-particle" to the electron.
How much work must be done to accelerate a particle of mass 2.1 × 10-14 kg from a speed of 1.5 × 108 to a speed of 2.5 × 108 m/s? (c = 3.00 × 108 m/s)
What will be an ideal response?
Consider the following situations:
· a car slowing down at a stop sign · a ball being swung in a circle at constant speed · a vibrating string · the Moon orbiting the Earth · a skydiver falling at terminal speed · an astronaut in an orbiting space station · a ball rolling down a hill · a person driving down a straight section of highway at constant speed with her foot on the accelerator · a molecule in the floor of this room In how many of the situations is the object accelerating?
1.One of the situations. 2.Two of the situations. 3.Three of the situations. 4.Four of the situations. 5.Five of the situations. 6.Six of the situations. 7.Seven of the situations. 8.Eight of the situations. 9.Nine of the situations. 10.None of the situations.