_________ in our atmosphere is a direct consequence of the emergence of life.

a. Carbon dioxide
b. Water vapor
c. Nitrogen
d. Oxygen
e. Helium


d. Oxygen

Physics & Space Science

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Describe some of the features of Mercury's surface and briefly explain how these features are believed to have formed

What will be an ideal response?

Physics & Space Science

Matter Waves: A proton and an electron are both accelerated to the same final kinetic energy. If ?p is the de Broglie wavelength of the proton and ?e is the de Broglie wavelength of the electron, then

A. ?p > ?e. B. ?p = ?e. C. ?p < ?e.

Physics & Space Science

A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the vertical impulse the catapult receives from the rock is

A.

5.1 × 104 Ns.

B.
6.1 × 104 Ns.

C.
8.0 × 104 Ns.

D.
5.0 × 105 Ns.

E.
6.0 × 105 Ns.

Physics & Space Science

In an AC series circuit the capacitive reactance is 217 ? and frequency is 56 Hz. What is the capacitance?

a. 2.62E–5 F b. 8.23E–5 F c. 1.31E–5 F d. 1.85E–5 F e. 3.71E–5 F

Physics & Space Science