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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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
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 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