The half-life of 18N is 0.62 s. What is the decay constant for this isotope?
a. 0.43 s–1
b. 1.1 s–1
c. 1.7 × 10^–11 Ci
d. The decay constant is not defined for a half-life of less than one second.
b
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What is the ecliptic?
A. the extension of Earth's path on the celestial sphere B. the line of the solar and lunar eclipses on the celestial sphere C. the elliptical shape of Earth's orbit around the Sun D. All of these choices are correct.
The nuclear force is:
a. weaker than the electromagnetic force. b. almost independent of charge. c. long range. d. stronger with positively charged particles. e. always negatively charged.
A projectile is projected from the origin with a velocity of 10.0 m/s at an angle of 30.0 degrees above the horizontal. What is the velocity of the projectile 2.00 seconds later?
A. Vx = 8.7 m/s, Vy = -14.6 m/s B. Vx = 14.6 m/s, Vy = -5.6 m/s C. Vx = -8.7 m/s, Vy = -14.6 m/s D. Vx = -14.6 m/s, Vy = 8.7 m/s E. Vx = 5.6 m/s, Vy = -14.6 m/s
If all of the asteroids in the solar system were gathered into a single object, how big would it be once gravity compressed it?
A) about half the diameter of Earth's Moon B) about the size of Earth's Moon C) about the size of the Earth D) about the size of a Neptune