A radio signal emitted from Earth would take about
A) 4 years to leave our galaxy.
B) 20,000 years to leave our galaxy.
C) 80,000 years to leave our galaxy.
D) 100,000 years to leave our galaxy.
Answer: A
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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
If a woman weighs 125 lb, her mass expressed in kilograms is x kg, where x is
A) less than 125. B) greater than 125.
An electric car is designed to run off a bank of 15-V batteries with total energy storage of 2.1 × 10^7 J. If the electric motor draws 4 200 W in moving the car at a steady speed of 14 m/s, how far will the car go before it is "out of juice?"
a. 35 km b. 70 km c. 140 km d. 110 km e. 18 km
Galaxy collisions were more common in the past
Indicate whether the statement is true or false