A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope becomes thicker and heavier. What is the orientation of the reflected and transmitted pulses?
A) Both pulses are right side up.
B) The reflected pulse returns right side up while the transmitted pulse is inverted.
C) The reflected pulse returns inverted while the transmitted pulse is right side up.
D) Both pulses are inverted.
C
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The moons of Mars are believed to be
a. composed primarily of iron and nickel. b. composed primarily of frozen gases of water and carbon dioxide. c. orbiting Mars in a direction opposite to the direction that Mars rotates. d. formed from material ejected from Olympus Mons and other large volcanoes on Mars. e. captured asteroids.
What evidence do we have that Earth's magnetic field reverses its polarity every 250,000 years?
A. Earth's magnetic field strength and direction change constantly. B. The direction of the magnetic field is "frozen" into new crust as it cools. C. historical documents from ancient Egypt and other civilizations D. Core samples from Antarctica show a regular change in polarity. E. All of these choices are correct.
Which of the following sequences of electromagnetic radiation is correct in order of increasing energy?
a. gamma rays, X-rays, infrared, radio b. radio, microwave, gamma rays, UV c. visible, UV, X-rays, gamma rays d. visible, microwave, radio, infrared e. infrared, visible, radio, X-rays
Angular Momentum: A merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round. As he does this, it is true to say that
A. the moment of inertia of the system decreases and the angular speed increases. B. the moment of inertia of the system decreases and the angular speed decreases. C. the moment of inertia of the system decreases and the angular speed remains the same. D. the moment of inertia of the system increases and the angular speed increases. E. the moment of inertia of the system increases and the angular speed decreases.