An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
A. 35 m/s
B. 25 m/s
C. 30 m/s
D. 21 m/s
E. 17 m/s
Answer: D
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Would it be plausible for a planet that had an Earth-like atmosphere with plentiful oxygen, but no life of any kind, to exist in another solar system?
a. Plausible. Life requires far more than oxygen to exist. b. Plausible. The oxygen may have been transported there by cometary impacts. c. Implausible. Oxygen is highly reactive and its presence in an atmosphere suggests replenishment by a living organism of some sort. d. Implausible. Oxygen is essential to life.
The flat rotation curves of spiral galaxies tell us that they contain a lot of dark matter. Do they tell us anything about where the dark matter is located within the galaxy?
A) Yes, they tell us that dark matter is concentrated near the center of the galaxy. B) Yes, they tell us that dark matter is spread uniformly throughout the galactic disk. C) Yes, they tell us that dark matter is spread throughout the galaxy, with most located at large distances from the galactic center. D) No, we cannot determine anything about the location of dark matter from the rotation curve.
As a river overflows its channel, sediment is deposited along the channel banks. What type of sediment is deposited first? What type is deposited last?
What will be an ideal response?
Which of the following is the type of particle that almost never interacts with normal matter?
A) neutrons B) electrons C) neutrinos D) protons