Graphical Analysis: If the velocity versus time graph of an object is a horizontal line, the object is
A. moving with zero acceleration.
B. moving with constant non-zero acceleration.
C. at rest.
D. moving with increasing speed.
Answer: A
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Work is defined as force times
a. distance. b. time. c. parallel distance. d. perpendicular distance.
The critical angle is that angle of incidence for which the angle of refraction equals ______
Fill in the blank(s) with correct word
A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth, Andrea rides on a spaceship that travels away from Earth at a speed of 0.60c for 10 years (as measured by Courtney)
At the end of the trip, Courtney is 20 years old. How old is Andrea? A) 10 years B) 12 years C) 18 years D) 20 years
Matter Waves: Electrons are accelerated to a speed of 4.0 × 104 m/s and are then aimed at a double-slit apparatus, where interference fringes are detected. If the electrons were replaced by neutrons, what speed must neutrons have to produce interference fringes with the same fringe spacing as that observed with the electrons? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, mneutron = 1.675 × 10-27 kg)
A. 2.2 × 101 m/s B. 7.3 × 107 m/s C. 1.7 × 106 m/s D. 9.3 × 102 m/s