Buoyancy: A polar bear of mass 200 kg stands on an ice floe that is a uniform 1.0 m thick. What is the minimum area of the floe that will just support the bear in saltwater of density 1030 kg/m3? The density of ice is 980 kg/m3.
A. 1.0 m2
B. 2.0 m2
C. 3.0 m2
D. 4.0 m2
Answer: D
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The excited state of a certain atom is 3.2 eV ± 0.21 eV. (h = 6.626 × 10-34 J ? s, 1eV = 1.60 × 10-19 J)
(a) What is the average lifetime of this state, in femtoseconds? (b) If the excited energy were doubled (to 6.4 eV ± 0.21 eV), how would the lifetime be affected?
What is the primary reason that we launch X-ray telescopes into space rather than building them on the ground?
A. It is less expensive to launch them into space. B. On the ground, there would be too much light pollution from nearby cities. C. Atmospheric turbulence blurs X-ray images too much. D. X-rays from space do not reach the ground.
______________ acceleration is necessary for uniform circular motion
Fill in the blank(s) with correct word
Jack, a quarterback, imparts a spin with his fingers when he throws the football during a match. The concept of _____ explains why the ball continues to spin rapidly as it flies through the air
A) kinetic energy B) angular momentum C) linear force D) specific gravity