Which of the following statements about our Sun is not true?
A) The Sun contains more than 99% of all the mass in our solar system.
B) The Sun is a star.
C) The Sun's diameter is about 5 times that of Earth.
D) The Sun is made mostly of hydrogen and helium.
C
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Determine the drag force acting per unit length in a 1 in diameter steel cable when air at 60ºF, 14.7 psia moves trasnversely (perpendicularly) across the cable at 30 mph.
The equilibrium rule applies to
A) vector quantities. B) quantities that are equal in magnitude. C) scalar quantities. D) any kind of quantities.
How can a nucleus be described by particular values of A, Z and N when the mass of the nucleus is not equal to Zmp + Nmn, where mp and mn are the masses of free protons and neutrons?
a. A, Z and N have no intrinsic meaning. b. A, Z and N describe the number of particles of given types, but mass has no meaning when part of the mass is elsewhere in the universe. c. A, Z and N describe the number of particles an ideal rather than a real nucleus would have. d. A, Z and N describe the number of particles of given types in the nucleus, but not their masses in a bound state. e. A, Z and N describe the number of particles of given types in the nucleus since the missing mass consists of electrons that are also present in the nucleus.
The Moon's synodic period is longer than its sidereal period
a. True b. False Indicate whether the statement is true or false