Which of the following has been the most important for maintaining the Earth's stable climate over the time it took for large organisms to evolve?

A) impacts of water-bearing planetesimals
B) the ending of the heavy bombardment
C) plate tectonics
D) the tides
E) deep sea volcanic vents


C) plate tectonics

Physics & Space Science

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A 0.50kg disk spins at 250rpm. A torque of 12.5Nm is applied for 0.150s to bring it to rest. What is the disk’s radius?

A. 0.54m B. 0.38m C. 0.29m D. 0.14m

Physics & Space Science

This photograph, taken with a blinking strobe light, shows the path of a bouncing tennis ball. How could we make a similar photograph of the path of a bouncing electron?

A) We couldn't. An electron cannot have a well-defined path like a tennis ball. B) We'd need to use a strobe that emitted short wavelength x-rays rather than visible light. C) We'd need to view the electron through a powerful electron microscope. D) We'd need a strobe that blinked much faster, at least a trillion times per second.

Physics & Space Science

A loop of wire is rotated about a diameter (which is perpendicular to a given magnetic field.) In one revolution the induced current in the loop reverses direction how many times?

A) 0 B) 4 C) 2 D) 1 E) 3

Physics & Space Science

The force required to maintain an object at a constant velocity in free space is equal to

A) zero. B) the mass of the object. C) the weight of the object. D) the force required to stop it.

Physics & Space Science