In ?- decay, the number of neutrons in the nucleus is
A) decreased by 1.
B) decreased by 2.
C) increased by 1.
D) increased by 2.
E) remains unchanged.
A
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Consider the solar system as a “system” of particles. Which of the below qualify as internal interactions (A) and which as external interactions (E)?
(a) The contact interactions between the earth and a car moving on the earth’s surface (b) The gravitational interaction between the earth and the International Space Station (c) The gravitational interaction between two planets (d) The gravitational interaction between a given planet and the sun (e) The magnetic interaction between the sun and the earth (both have magnetic fields) (f) The gravitational interaction between the sun and the larger galaxy
The longest wavelength of visible light is _____
A) 400 nanometers B) 500 nanometers C) 700 nanometers D) 900 nanometers
Supergiants are about as common as the sun
Indicate whether the statement is true or false
According to Bernoulli's equation, the pressure in a fluid will tend to decrease if its velocity increases. Assuming that a wind speed of 1 m/s causes a pressure drop of 0.645 Pa, what pressure drop is predicted by Bernoulli's equation for a wind speed of 5 m/s?
A. 1.29 Pa B. 3.325 Pa C. 16.125 Pa D. 1.94 Pa