The acceleration of a body cannot be zero at a point where
A. the average velocity is positive.
B. the instantaneous velocity is zero.
C. the instantaneous velocity is positive but decreasing.
D. None of these choices are correct
Answer: C
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Young's Modulus: A 1200-kg car is being raised with a constant acceleration of 2.53 m/s2 by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0 × 1011 N/m2. What is the change in length of the cable caused by lifting the car?
A. 8.4 mm B. 8.4 cm C. 4.9 mm D. 4.9 cm E. 4.9 m
It is possible with appropriately shaped external magnetic poles to create a situation where the effect of those poles does not vary with position along the SG axis. Imagine a small magnet placed in such a situation. What is the direction of the net force on the small magnet?
A. Upward. B. Downward. C. There is zero net force, no matter how the magnet is oriented. D. The answer depends on the magnet’s orientation. E. None of the above (explain).
A 10th magnitude star is ________ than a 5th magnitude star.
A. 2 times fainter B. 100 times fainter C. 2 times brighter D. 100 times brighter
What is the magnitude of the cross product of a vector of magnitude 2.00 m pointing east and a vector of magnitude 4.00 m pointing 30.0° west of north?
A) 6.93 B) -6.93 C) 4.00 D) -4.00 E) 8.00