Stars with masses less than ____ produce most of their energy via the proton-proton chain
a. 0.01 solar masses
b. 0.1 solar masses
c. 1.1 solar masses
d. 11 solar masses
e. 110 solar masses
C
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A car is traveling at 30.0 m/s when the driver suddenly applies the brakes, giving the car a constant deceleration
The car comes to a stop in a distance of 120.0 m. What was the deceleration of the car? A) 3.75 m/s2 B) 4.00 m/s2 C) 4.25 m/s2 D) 4.50 m/s2 E) 4.75 m/s2
Reasoning from the fact that the nucleus is very small, we can conclude that the nuclear force must
A) operate only between neutrons, and not between protons. B) have a very long range. C) have a very short range. D) be repulsive and very strong. E) be attractive and very strong.
Radiation Doses: The maximum permissible workday dose for occupational exposure to radiation is 18 mrem. A 54-kg laboratory technician absorbs 2.6 mJ of 0.30-MeV gamma rays in a work day. The relative biological effectiveness (RBE) for gamma rays is 1.00. What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage?
A. 0.27 B. 0.29 C. 0.32 D. 0.35 E. 0.37
A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 490 V/m B) 840 V/m C) 65 V/m D) 120 V/m E) 22 V/m