An iron ball and a wooden ball of the same size are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
A) lighter wooden ball.
B) heavier iron ball.
C) both hit at the same time.
D) not enough information
Answer: B
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Velocity: A bat, flying toward the east at 2.0 m/s, emits a shriek that is reflected back to it from a wall that is 20.0 m in front of the bat at the instant the shriek is emitted. Sound travels at 340 m/s in the air. How many milliseconds after emitting the shriek does the bat hear the reflected echo from the wall?
Fill in the blank(s) with the appropriate word(s).
What power contact lens is needed to correct for farsightedness where the uncorrected near point is 75 cm?
A) +2.7 D B) -2.7 D C) +5.3 D D) -5.3 D
Double-Slit Interference: The distance between two slits is 1.50 × 10-5 m. A beam of coherent light of wavelength 600 nm illuminates these slits, and the distance between the slit and the screen is 2.00 m. What is the distance on the screen between the central bright fringe and the fourth-order bright fringe?
A. 0.132 m B. 0.201 m C. 0.324 m D. 0.528 m E. 0.688 m
Meters: A galvanometer with a coil resistance of 80 ? deflects full-scale for a current of 2.0 mA. What series resistance is required to convert it to a voltmeter reading full scale for 200 V.
A. 100 m? B. 0.80 m? C. 13 M? D. 250 k? E. 100 k?