What are the three periods of Mars's planetary history?
What will be an ideal response?
Noachian, Hesperian, Amazonian
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What is the accepted explanation for millisecond pulsars?
What will be an ideal response?
Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2. If an electric field of 2.0 × 106 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?
What will be an ideal response?
A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth,
Andrea rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measured by Courtney), then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return? A) 10 years B) 12 years C) 15 years D) 18 years E) 20 years
A mass of 1.0 kg is pushed against a spring with a spring constant of 25 N/m. As a result, the spring is compressed by 20 cm. The mass is then released
(a) What is the amount of potential energy acquired by the spring when it is compressed? (b) What is the kinetic energy of the mass after the mass is released and it is no longer in contact with the spring?