A beam of protons is sent through a target and 60% get through. If the target then has its thickness doubled, what percent of the beam would then get through?
A)
20%
B)
36%
C)
40%
D)
60%
E)
80%
B
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What do the electron configurations for all the group 18 noble gases have in common?
A) They have the same number of electrons. B) They occupy the same number of shells. C) Their outermost occupied shells are filled to capacity. D) all of the above
How fast (in m/s) is the Concorde moving if it reaches Mach 1.5? (The speed of sound in air is 344 m/s.)
a. 229 b. 516 c. 416 d. 728 e. 858
A horizontal disk rotates about a vertical axis through its center. Point P is midway between the center and the rim of the disk, and point Q is on the rim
If the disk turns with constant angular velocity, which of the following statements about it are true? (There may be more than one correct choice.) A) P and Q have the same linear acceleration. B) Q is moving twice as fast as P. C) The linear acceleration of Q is twice as great as the linear acceleration of P. D) The linear acceleration of P is twice as great as the linear acceleration of Q. E) The angular velocity of Q is twice as great as the angular velocity of P.
An organ pipe open at both ends has a radius of 4.0 cm and a length of 6.0 m. What is the frequency (in Hz) of the third harmonic? (Assume the velocity of sound is 344 m/s.)
A. 76 B. 86 C. 54 D. 28 E. 129