An astronaut leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year
) According to the astronaut, how long does the trip take? A) 14.4 y
B) 22.7 y
C) 9.34 y
D) 15.0 y
E) 4.20 y
E
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What is the kinetic energy of an electron in the n = 2 Bohr orbit of the hydrogen atom?
A) 2.71 × 10-19 J B) 3.20 × 10-19 J C) 5.45 × 10-19 J D) 6.10 × 10-19 J E) 2.16 × 10-18 J
A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 ATM = 1.01 × 10^5 N/m2
a. 1.0 ATM b. 4.2 ATM c. 7.2 ATM d. 9.7 ATM e. 8.2 ATM
In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 10^4 N/m and the pressure on the bottom surface is 9.0 × 10^4 N/m2 . If the area of the top and bottom surfaces of each wing is 2.0 m2, what is the total lift on the model airplane?
a. 2.0 × 10^3 N b. 8.0 × 10^3 N c. 1.6 × 10^4 N d. 3.6 × 10^4 N e. 1.0 × 10^3 N
In water, does the molecule lysergic acid diethylamide act as an acid, a base, neither or both?
A) acid B) base C) neither an acid or a base D) both as an acid and as a base