Radioactive Decay: How long will it take a 4.50-kBq sample of material to reach an activity level of 0.140 kBq if the half-life of the sample is 435 years?
A. 14,478 years
B. 3245 years
C. 2178 years
D. 1993 years
Answer: C
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The possibility of life being transferred from another planet like Mars largely depends on whether that life can survive
A) being lasted from the parent planet B) inside the meteorite with very little water present C) long enough in space to make the journey to Earth D) the impact onto the Earth's surface
How did Newton deduce the dependence of the gravitational force on distance?
A) By observing the way that a large gravitational pendulum moved. B) By comparing the time it takes Earth to orbit the sun with the time it takes to spin on its axis. C) By calculating the moon's acceleration, and comparing it with the acceleration of a falling object. D) By comparing the accelerations of objects falling to Earth from different heights. E) By measuring the gravitational attraction between large massive lead spheres in the laboratory.
A railroad train travels forward along a straight track at 90.0 m/s for 1 000 m and then travels at 70.0 m/s for the next 1 000 m. What is the average velocity?
a. 79.3 m/s b. 78.8 m/s c. 83.8 m/s d. 75.8 m/s e. 81.5 m/s
If you float a piece of wood in a container brim-full of water that rests on a weighing scale, some water will spill. Then the weight reading on the scale will
A) decrease. B) remain unchanged. C) increase.