A 50-g ball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 20.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the magnitude of the average acceleration of the ball during this time interval?
a. 714 m/s2
c. 6430 m/s2
b. 1430 m/s2
d. 12,900 m/s2
D
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You are given two converging lenses to build a compound microscope. Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm. Which one of the two lenses would you use for the objective?
A) Lens A, because it has the shorter focal length. B) Lens B, because it has the longer focal length. C) It makes no difference which lens I use for the objective. D) None, because the objective should be a diverging lens.
The present standard for time is based on
a. the transition of an electron between two energy levels of the cesium-133 atom. b. Earth's rotation. c. Earth's orbit. d. none of these.
Exclusion Principle: A hydrogen atom is in the 6h state. Which one of the following numbers could be an orbital angular momentum quantum number ? for that state?
A. 5 B. 6 C. 7 D. 8 E. 9
A spaceship from another galaxy passes over the solar system directly above a radial line from the Sun to the Earth. (We measure that distance to be 1.5 × 1011 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80c, for which ? = 5/3. As measured on Earth it takes the spaceship 625 seconds to travel from the Sun to Earth. When a scientist in the spaceship measures the Earth-Sun distance and the time it takes her to travel that distance, she finds the results are, respectively
A. 9.0 × 1010 m; 375 s. B. 9.0 × 1010 m; 625 s. C. 1.5 × 1011 m; 625 s. D. 2.5 × 1011 m; 625 s. E. 2.5 × 1011 m; 1042 s.