A container is filled with water and the pressure at the container bottom is P. If the container is instead filled with oil having specific gravity 0.80, what new bottom pressure results?
a. a pressure < P
b. the same pressure P
c. a pressure > P
d. This is unable to be determined with the information given.
a
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Of these, which is evidence that Mars once had running water on its surface?
A. There are vast amounts of H2O present in Martian rocks. B. Spacecraft have observed channels and dry riverbeds on the Martian surface. C. There is a medium-sized ocean in the Southern Hemisphere of Mars. D. There is no such evidence.
Four different objects have spectra that peak in the wavelength regions listed below. Which peak wavelength region is associated with the coldest of the four objects?
A) x-rays B) visible light C) infrared D) ultraviolet
A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. What is the speed of the block when it passes through the equilibrium point?
a. 2.1 m/s c. 0.80 m/s b. 1.6 m/s d. 0.57 m/s
What is the most abundant element for Earth as a whole?
What will be an ideal response?