The main sequence is luminosity class V
Indicate whether the statement is true or false
TRUE
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Transfer of heat in the Earth's mantle is dominated by
A) radiation B) seismic waves C) convection D) conduction
A 60-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 25 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder
a. 1.4E+1 N b. 1.6E+2 N c. 2.4E+2 N d. 2.7E+2 N e. 4.2E+3 N
Which of the following solutions is the most acidic?
A) a solution with a pH = 14 B) a solution with a pH = 12 C) a solution with a pH = 7 D) a solution with a pH = 13 E) All of the solutions are basic.
If an operatic aria lasts for 5.75 min, its length expressed in seconds is x s, where x is
A) less than 5.75. B) greater than 5.75.