For a particular spring, the spring constant
A. Increases as the spring is stretched
B. Increases as the spring is compressed
C. Decreases as the spring is compressed
D. Is the same regardless of stretching or compressing
Ans: D. Is the same regardless of stretching or compressing
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A 20 N ball and a 40 N ball are dropped at the same time from a height of 10 meters. Air resistance is negligible. Which of the following statements is accurate?
A. After 1 second has elapsed, both balls have the same kinetic energy, since they have the same acceleration B. Both balls hit the ground at the same time but gravity does more work on the heavy ball than on the light ball C. The heavy ball has a greater acceleration and falls faster D. The light ball has a greater speed, since it can accelerate faster than the heavy ball
What are Sun grazers?
a. asteroids that impact the Sun b. meteors that impact the Sun c. any celestial body that orbits the Sun d. asteroids that come in close proximity to the Sun e. comets that come in close proximity to the Sun
What species absorbs photons in a protostar's outer layers?
A) H B) H2 C) H+ D) H- E) dust
When a nucleus undergoes alpha decay, the daughter element always has
A. more electrons than the parent. B. less charge than the parent. C. more neutrons than the parent. D. the same atomic number as the parent.