The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s acceleration is negative in region III.
a.
True
b.
False
b
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A projectile is projected from the origin with a velocity of 25.0 m/s at an angle of 50.0 degrees above the horizontal. What is the time of maximum height of the projectile?
A. 1.95 s B. 2.03 s C. 2.67 s D. 3.01 s E. 3.45 s
Which system has the greater entropy, a puddle of water sitting on a table next to a chaotic scattering of salt crystals or the same amount of salt dissolved in an evenly distributed way in the puddle? Be prepared to describe your reasoning.
A. The puddle and the scattered crystals. B. The puddle with the dissolved salt. C. Both have the same entropy. D. One needs detailed models of water and salt to say.
Radiation dosage is commonly measured in
A) rads. B) rems. C) joules. D) none of the above
The limiting angle of resolution for the eye is 1.4 × 10-4 rad. What is the minimum separation between two point sources of light that the eye can distinguish if they are at a distance of 40 m from the observer?
A) 2.8 × 10-3 m B) 5.6 × 10-3 m C) 1.4 × 10-3 m D) 8.4 × 10-3 m E) 4.7 × 10-3 m