1 If you drove day and night without stopping for half a year without esceeding

Question

1 If you drove day and night without stopping for half a year without esceeding the legal highway speed limit in the United States, 70 mph, the maximum number of miles you couid ve would be closest to a 8700 b. 300,000. e. 500,000. d. 1,000,000. e. 32,000,000. 2. A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If il enters with a speed of 500 m/s and emerges with a speed of 300 m/s, what is the bullet's acceleration as it passes through the hoard? a. -500 km/s b. -470 km/s c.-360 km/s d. -570 km/s e. -275 km/s

Explanation / Answer

1. t (in h) = (365/2)(24)

= 4380 h

d = (70)(4380)

= 306600

Ans(b)

2. vf^2 - vi^2 = 2 a d

300^2 - 500^2 = 2(a)(0.14)

a = - 571.4 x 10^3 m/s^2

= - 571.4 km / s^2

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