The number of protons in a nucleus is the
a. mass number.
b. neutron number.
c. atomic number.
d. isotope number.
e. none of the above
c
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An isotope of fluorine has 9 protons and 10 neutrons. What are the atomic number and atomic weight of this fluorine? If we added a proton to this fluorine nucleus, would the result still be fluorine? What if we added a neutron instead? Explain
What will be an ideal response?
According to the sign conventions in the book, which objects have a negative focal length?
A. Nothing has a negative focal length B. Diverging lens and converging mirror C. Diverging lens and diverging mirror D. Converging lens and diverging mirror
Blocks A and B of masses 18 kg and 19 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown
The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. In Figure 5.20, force P equals 76 N. The force Q for which the block descends at constant speed is closest to: A) 120 N B) 130 N C) 140 N D) 160 N E) 72 N
Carnot Engine: A heat engine having the maximum possible efficiency has an efficiency of 25% when operating between two heat reservoirs. If the temperature of the cold reservoir is 300 K, what is the temperature of the hot reservoir?
A. 350 K B. 375 K C. 400 K D. 450 K E. 500 K