If the length of a box is reduced by one-third and the width and height are doubled, by what factor has the volume changed?
A. 4/3
B. 2/3
C. 3/4
D. 3/2
A. 4/3
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A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s. At this time, the driver suddenly realizes that she must stop the car
If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign? A) 2.89 m/s2 B) 3.89 m/s2 C) 4.17 m/s2 D) 3.42 m/s2 E) 2.08 m/s2
A rectangle has a length of 1.323 m and a width of 4.16 m. Using significant figure rules, what is the area of this rectangle?
a. 5.50368 m2 b. 5.5037 m2 c. 5.504 m2 d. 5.50 m2 e. 5.5 m2
A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the moon, 384,000 km away. What is the radius of the big red spot on the moon?
a. 500 m b. 250 m c. 120 m d. 1.0 km e. 2.7 km
Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)
A) The image is always real. B) The image is always virtual. C) The image is always inverted. D) The image is always upright. E) None of the above choices are correct.