A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?
a. 39 N
b. 20 N
c. 44 N
d. 0 N
e. 30 N
B
Physics & Space Science
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If the source moves, the wavelength of the sound in front of the direction of motion is smaller than the wavelength behind the direction of motion
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What is the length of time half of the Moon stays in sunlight per full rotation?
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a. true b. false
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