Constant Acceleration Kinematics: A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?
A. 15 s
B. 30 s
C. 45 s
D. 4.2 s
Answer: D
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Of the temperature ranges below, which range represents the smallest range of actual temperature?
A) 50-100° Kelvin B) 50-100° Celsius C) 50-100° Fahrenheit D) They all represent the same change in temperature.
When a hydrogen atom absorbs a photon that raises it to the n = 5 state, how many different energies are possible for the photon(s) that may be emitted as the atom eventually returns to the ground state?
a. 5 c. 4 b. 3 d. The correct value is not given.
______________are molecules with many repeating units.
Fill in the blank(s) with the appropriate word(s).
The graph shows 
versus t for an object moving along straight line. What is the average velocity from t = 0 to t = 11 s?
A. 25 
B. 36
C. 30
D. 21