A brick weighs 50.0 N, and measures 30.0 cm × 10.0 cm × 4.00 cm. What is the maximum pressure it can exert on a horizontal surface due to its weight?
A) 1.25 Pa
B) 12.5 Pa
C) 1.25 kPa
D) 12.5 kPa
D
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On a calm day (no wind), you can run a 1500-m race at a velocity of 4.0 m/s. If you ran the same race on a day when you had a constant tailwind of 2.0 m/s, the time it would take you to finish would be
A) 250 s. B) 9000 s. C) 1125 s. D) 750 s. E) 500. s.
Two projectiles are launched 50° above horizontal but with different initial speeds. Which of the following must be true while the projectiles are in the air? (Ignore air resistance.)
A. The horizontal speeds of both projectiles are the same B. The one with larger initial speed will experience a larger vertical acceleration C. The projectiles will reach the same maximum height D. The horizontal accelerations of both projectiles are the same: zero
_____ is a process by which an organism extracts energy from the surroundings, maintains itself, and modifies the surroundings to foster its own survival and reproduction
A) Fission B) Life C) Fossilization D) Mineralization
How much of the sky is north of the celestial equator?
a. less than one-half, because of the tilt of the equator to the ecliptic plane b. more than one-half, because of the precession of the poles c. exactly one-half d. all of the night sky