While flying horizontally in an airplane, you notice that a string dangling from the overhead luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane
Using this observation, you can conclude that the airplane is
A) moving forward.
B) accelerating forward.
C) not accelerating because the string is at rest.
D) accelerating backward.
E) moving backward.
D
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Red and blue in redshift and blueshift refer to color
a. True b. False Indicate whether the statement is true or false
Refracting Telescope: The focal length of the objective lens of a telescope is 75.0 cm, and the eyepiece has a focal length of 6.00 cm. What is the magnification of this telescope?
A. 0.0800 B. 0.645 C. 450 D. 12.5 E. 200
A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called
a. an oxidizing agent. b. a catalyst. c. an activation agent. d. a reducing agent.
The internal resistances of an ideal voltmeter and an ideal ammeter are, respectively (ideal meaning the behavior of the system is not changed when using the meter):
a. zero and infinite. c. zero and zero. b. infinite and zero. d. infinite and infinite.