An electric field makes a charged particle accelerate but a magnetic field takes it around in a circle
Indicate whether the statement is true or false
TRUE
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High-mass stars become ________ variables when they cross the instability strip, while low-mass stars become ________ variables.
A. RR Lyrae; Cepheid B. T Tauri; Cepheid C. Cepheid; RR Lyrae D. Cepheid; T Tauri E. ZZ Ceti; RR Lyrae
An imaginary line from one geographic pole to the other along the surface of Earth perpendicular to the equator is called
a. a longitude. b. a meridian. c. the International Date Line. d. a parallel.
Boat 1 goes directly across a stream a distance L and back taking a time t1 . Boat 2 goes down stream a distance L and back taking a time t2 . If both boats had the same speed relative to the water, which of the following statements is true?
a. t2 > t1 b. t2 < t1 c. t2 = t1 d. t2 = 2t1 e. t2 = 0.5t1
What types of events ended the Paleozoic era?
What will be an ideal response?