Which of the following statements about the force attracting these two galaxies is true?
A) It is the same force that causes an apple to fall to the ground.
B) It is a force unlike any force that we ever experience on Earth.
C) It is a mysterious force, whose nature remains completely unknown to scientists.
D) The force will get weaker as time passes.
A) It is the same force that causes an apple to fall to the ground.
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Radioactive Decay: The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 × 105 Bq, to decay to an activity of 100 Bq?
A. 45 days B. 36 days C. 54 days D. 31 days
Entropy: On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 25 kW. At what rate is the entropy of the air outside the house changing as a result of this process?
A. +13 W/K B. -25 W/K C. 85 W/K D. +99 W/K E. 0 W/K
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
A) greater with the haystack. B) greater with the brick wall. C) both the same
An airplane with an airspeed of 120 km/h has a heading of 30° east of north in a wind that is blowing toward the west at 30 km/h. What is the speed of the plane relative to the ground?
A) 150 km/h B) 90 km/h C) 140 km/h D) 110 km/h