A bicyclist starts down a hill with an initial speed of 2.0 m/s. She moves down the hill with a constant acceleration, arriving at the bottom of the hill with a speed of 8.0 m/s. If the hill is 12 m long, how long did it take the bicyclist to travel down the hill?
2.4 s
Physics & Space Science
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If molecules in the sky scattered orange light instead of blue light, sunsets would be colored
A) orange. B) yellow. C) green. D) blue. E) none of the above
Physics & Space Science
An electric razor in Europe completes 50 vibrations in 1 s. The frequency of these vibrations is
A) 50 Hz with a period of 1/50 s. B) 1/50 Hz with a period of 50 s. C) 50 Hz with a period of 50 s. D) 1/50 Hz with a period of 1/50 s.
Physics & Space Science
Group characteristics - Lewis symbol
The Lewis symbol 
would be characteristic of which group?
a. 2A
b. 4A
c. 3A
d. 5A
Physics & Space Science
An aluminum foil 0.10 mm thick has how many aluminum atoms per square cm? (The density of aluminum is 2.7 × 103 kg/ m3 and the atomic mass of aluminum is 27.)
A) 6 × 1017 B) 6 × 1020 C) 6 × 1024 D) 6 × 109 E) 6 × 1030
Physics & Space Science