What do we mean by "The Oxygen Crisis" in relation to the evolution of life on Earth?
A) the extinction of older anaerobic life as oxygen builds up in the atmosphere
B) the time period before the development of the ozone layer
C) a period when evolution accelerated so rapidly that there was insufficient oxygen available
D) the destruction of oxygen in the early atmosphere
A
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A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive spaceship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is
A) still zero. B) non-zero, directed toward the spaceship. C) non-zero, directed away from the spaceship.
What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N / m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
a. 66 A b. 89 A c. 61 A d. 75 A e. 37 A
Which of the following is not a property of refractory metals?
(a) High melting temperature (b) Good oxidation resistance at high temperature (c) High strength (d) High elastic modulus
Rotational Dynamics: The drive chain in a bicycle is applying a torque of 0.850 N ? m to the wheel of the bicycle. You can treat the wheel as a thin uniform hoop (or ring) with a mass of 0.750 kg and a radius of 33.0 cm. What is the angular acceleration of the wheel?
A. 10.4 rad/s2 B. 20.8 rad/s2 C. 5.20 rad/s2 D. 3.43 rad/s2 E. 1.06 rad/s2