For which of the graphs was the result most curved, and closest to the one we are familiar with for the planet orbits about the Sun?
A.) 0%.
B.) 25%.
C.) 50%.
D.) 75%.
E.) 100%.
Ans: A.) 0%.
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Energy and Momentum: An 8.0-g bullet is suddenly shot into a 4.0-kg block, at rest on a frictionless horizontal surface, as shown in the figure. The bullet remains lodged in the block. The block then moves against a spring and compresses it by 8.9 cm. The force constant (spring constant) of the spring is 1400 N/m. What is the magnitude of the impulse on the block (including the bullet inside) due to the spring during the entire time interval during which the block compresses the spring?
A. 13 N ? s B. 12 N ? s C. 10 N ? s D. 8.3 N ? s E. 6.7 N ? s
What is the Hubble telescope classified as a telescope?
What will be an ideal response?
Identical point charges (+30 ?C) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 ?C from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
A. 22 J B. 16 J C. 13 J D. 19 J E. 8.0 J
A rock suspended by a weighing scale weighs 3 N when submerged in water and 5 N out of water. What is the buoyant force on the rock?
A) 8 N B) 5 N C) 3 N D) 2 N E) none of the above