What process has played the greatest role in determining the arrangement of the continents on Earth?

A) impact cratering
B) volcanism
C) plate tectonics
D) erosion
E) acid rain


C) plate tectonics

Physics & Space Science

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The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%

(Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element? A) The power is still 2.0 kW. B) The power increases to 2.2 kW. C) The power decreases to 1.8 kW. D) None of the given answers is correct.

Physics & Space Science

An electron and an alpha particle (a helium-4 nucleus) each have the same non-relativistic speed. Which has the greatest kinetic energy, and which has the shortest de Broglie wavelength?

a. the alpha particle, the alpha particle b. the alpha particle, the electron c. the electron, the alpha particle d. the electron, the electron

Physics & Space Science

Thermodynamic Devices: An ideal reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C. What is the coefficient of performance of this heat pump?

A. 10.4 B. 9.44 C. 0.644 D. 0.533 E. 0.0962

Physics & Space Science

In relativity, two people share the same frame of reference only if

A) they are not moving relative to each other. B) they are both located in the same place. C) they are both located in the same place and are traveling at the same speed. D) they are both located in the same place and are stationary. E) they agree on the laws of nature.

Physics & Space Science