A baseball pitcher loosens up his pitching arm. He tosses a 0.20-kg ball using only the rotation of his forearm, 0.28 m in length, to accelerate the ball. What is the moment of inertia of the ball alone as it moves in a circular arc with a radius of 0.28 m?
a. 3.1E–3 kg·m2 b. 1.6E–2 kg·m2
c. 3.1E–2 kg·m2 d. 1.1E–2 kg·m2
e. 5.6E–2 kg·m2
b
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Suppose that you can crush an aluminum can by dropping a rock of mass m on it from a height h. Which of the following scenarios would crush two cans?
A. dropping a rock of mass 2m from height h B. dropping a rock of mass m from height 2h C. dropping a rock of mass 1/2m from height 4h D. all of the above E. none of the above
Although Saturn and Jupiter have similar compositions their outer appearances are different because
A. Saturn's cooler temperatures allow for the formation of a hazy layer of ammonia clouds that surrounds the planet. B. Saturn has more water molecules throughout its atmosphere giving it a uniform appearance. C. Saturn's smaller size means it has a weaker gravitational field and thus less dramatic atmospheric effects. D. Saturn's magnetic field is weaker than Jupiter's magnetic field.
When the Sun becomes a red giant
A) some life on Earth may still be able to survive on the surface B) life will probably not be able to survive even beneath the surface C) life may still be able to survive in the atmosphere D) the Earth will be destroyed
Determine the magnitude and sense (direction) of the current in the 500-? resistor when I = 30 mA.
A. 56 mA left to right B. 56 mA right to left C. 48 mA left to right D. 48 mA right to left E. 26 mA left to right