If the length of a wire increases, its resistance
a. increases
b. decreases
c. does not change
d. will increase or decrease depending on the composition
e. will change in a way that can not be determined
A
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In a single-slit diffraction experiment, the width of the slit is 1.90 ?m. If a beam of light of wavelength 610 nm forms a diffraction pattern, what is the angle associated with the second dark fringe above the central bright fringe?
A) 11.4° B) 9.35° C) 12.2° D) 39.9° E) 18.7°
Star A is identical to Star B, but Star A is twice as far from us as Star B. Therefore
A) both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A. B) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A. C) both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A. D) both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B.
A heavy frog and a light frog jump straight up into the air. They push off in such away that they both have the same kinetic energy just as they leave the ground. Air resistance is negligible
Which of the following statements about these frogs are correct? (There could be more than one correct choice.) A) Just as they leave the ground, the heavier frog is moving faster than the lighter frog. B) Just as they leave the ground, the lighter frog is moving faster than the heavier frog. C) They both leave the ground with the same speed. D) The lighter frog goes higher than the heavier frog. E) The heavier frog goes higher than the lighter frog. F) Both frogs reach the same maximum height.
Secondary waves can travel through all areas of Earth except the
A) surface. B) outer core. C) inner core. D) mantle.