A protostar of one-half solar mass would reach the main sequence in ________ time than it took our own Sun
Fill in the blank(s) with correct word
much more or longer
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Energy balance in the Sun refers to a balance between
A) the rate at which fusion generates energy in the Sun's core and the rate at which the Sun's surface radiates energy into space. B) the mass that the Sun loses each second and the amount of mass converted into energy each second. C) the force of gravity pulling inward and the force due to pressure pushing outward. D) the amount of energy the Sun radiates into space and the amount of energy that reaches Earth.
In a part of a printing press, a roller with a radius of 10 cm, rolls without slipping on the outside of a fixed cylinder with a radius of 30 cm. There is a connecting rod that connects the center of the cylinder to the axle of the roller
If the angular speed of the roller is 60 rad/s, what is the angular speed of the connecting rod? A) 15 rad/s B) 20 rad/s C) 120 rad/s D) 150 rad/s E) 180 rad/s
Peak values for a neodymium-glass laser are 600 J for 1.00 nanosecond. If the cross-section of the laser beam is 1.10 cm2, what are the maximum values of E and B? (µ0 = 4? × 10^?7 T?m/A, c = 3.00 × 10^8 m/s)
a. 2.0E+9 V/m, 1.9 T b. 5.7E+8 V/m, 6.8 T c. 2.0E+9 V/m, 6.8 T d. 5.7E+8 V/m, 1.9 T e. Not enough information.
White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively
A) high temperatures. B) few molecules per spark. C) low transfer of energy. D) all of the above E) none of the above