A water bug on the surface of a pond bobs up and down three times per second on ripples with wavelength 10.5 cm. A fish resting at the surface of the pond is 8.50 m from the water bug. How long does it take a ripple passing the water bug to reach the fish?
a. 27.0 s
b. 243 s
c. 81.0 s
d. 0.893 s
a
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A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/s2 when a 90 N horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2
What is the weight of the block on the moon? A) 77 N B) 67 N C) 58 N D) 48 N E) 39 N
Why is the air over an open flame always moist?
A) The hot flame vaporizes the water in the air above the flame. B) One of the products of combustion is water vapor. C) Warm air contains more humidity than cold air. D) None of the above is true.
A nearby galaxy has a radius of 4,000 million A.U. and rotates once every 800 million years. What is its mass in solar masses?
What will be an ideal response?
An extraterrestrial observer would pick up the strongest radio signals when
A) the Earth was at perihelion. B) at new or full moon. C) North America was directly in front of the observers. D) North America was either rising or setting for the observer. E) the Super Bowl is on.