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.
d
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Doubling the number of effective opaque layers in a planet’s atmosphere from n to 2n will make its average surface temperature increase by what factor?
A. 2 B. 21/4 C. 31/4 D. (2 + 1/n)1/4 E. [2 + 1/(n+1)]1/4 F. Some other factor (specify) T. The factor depends on the planet’s initial temperature.
A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s. What is the magnitude of the net force exerted on a 68.0 kg passenger during the acceleration?
A) 394 N B) 82.0 N C) 342 N D) 311 N
If P = 6.0 N, what is the magnitude of the force exerted on block 1 by block 2?
a.
6.4 N
b.
5.6 N
c.
4.8 N
d.
7.2 N
e.
8.4 N
Exhibit 17-1
The figure below shows a sine wave at one point of a string as a function of time.
?
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Use the exhibit to answer the following question(s).
Refer to Exhibit 17-1. Which of the graphs below shows a wave where the amplitude and frequency are each reduced in half?
A.
B.
C.
D.
E.
