The Tharsis region of Mars was most likely formed
A) from sediment that piled up due to past water erosion
B) by plate tectonics
C) by a plume of molten mantle material rising to the surface forming a bulge
D) from compressions in the Martian crust as the planet cooled and contracted
C
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The neap tides can only occur when the Moon's position is at or near one of its orbital nodes
a. True b. False Indicate whether the statement is true or false
A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
a. 0 b. 15 c. 29 d. 63 e. 250
Cubes of sugar, 1 cm on a side, are placed in water at 25ºC. Estimate the time before the lumps have dissolved; that is, when the sugar concentration at the lump is 10% by weight. Assume that the diffusivity of sugar into water is 6.9 x 10^-10m^2/s, the convective mass transfer coefficient is 6.4 x 10^-6m^2/s, and the self-diffusivity of sugar is 1 x 10^-5m^2/s. The density of sugar may be taken as 1500 kg/m^3.
What will be an ideal response?
A 0.20-kg mass is oscillating on a spring over a horizontal frictionless surface. When it is at a displacement of 2.3 cm for equilibrium it has a kinetic energy of 1.5 J and a spring potential energy of 2.3 J. What is the maximum speed of the mass during its oscillation?
a. 4.4 m/s b. 0.16 m/s c. 6.2 m/s d. 4.8 m/s e. 3.0 m/s