A swimmer heading directly across a river 200 m wide reaches the opposite bank in during which time she is swept downstream 480 m. (a) How fast can she swim in still water? (b) What is the speed of the current?
What will be an ideal response?
Answer: (a) 0.50 m/s (b) 1.2 m/s
Physics & Space Science
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Factors that increase ocean salinity are
A) runoff from streams and rivers. B) formation of sea ice. C) precipitation. D) glacial melting.
Physics & Space Science
A spectrograph spreads out light according to ____ to form a spectrum
a. wavelength b. frequency c. interference d. aberration e. grating
Physics & Space Science
There are three flavors of quarks
Indicate whether the statement is true or false
Physics & Space Science
A projectile is launched from the surface of a planet (mass = m, radius = r). What minimum launch speed is required if the projectile is to rise to a height of 2r above the surface of the planet? Disregard any dissipative effects of the atmosphere.
A.
B.
C.
D.
E.
Physics & Space Science