During the Hadean Eon, life
A) could have existed and survived regardless of impacts
B) may have existed but probably could not have survived for long periods due to sterilizing impacts
C) probably survived and existed until the end of the Hadean eon after which it was destroyed
D) could not have existed at all
B
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A 100-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 25°. What is the coefficient of static friction between box and ramp?
a. 0.15 c. 0.47 b. 0.27 d. 0.95
Simple Harmonic Motion: The figure shows a graph of the velocity v as a function of time t for a system undergoing simple harmonic motion. Which one of the following graphs represents the acceleration of this system as a function of time?
A. graph a B. graph b C. graph c D. graph d
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from n = 2 state to the ground state?
A) 121.5 nm B) 203.1 nm C) 243.0 nm D) 388.8 nm E) 411.1 nm
Does a high-speed bullet's path bend more than a light beam bends as it passes near Earth?
A) Yes, because the bullet is heavier than the light beam. B) Yes, because the light beam has a greater acceleration that the bullet. C) Yes, because the bullet moves slower than the light beam. D) No, because all falling objects accelerate at the same rate. E) No, because of Einstein's equivalence principle.