If a 600-W heater carries a current of 4.0 A, what is the voltage across the ends of the heating element?
a. 2 400 V
b. 150 V
c. 300 V
d. 0.0067 V
e. 4.9 V
b
Physics & Space Science
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Atomic Nucleus: The symbol for a certain isotope of polonium is 
Po. How many neutrons are there in the nucleus of this isotope?
A. 84 B. 130 C. 214 D. 298 E. 314
Physics & Space Science
A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the Moon, 384,000 km away. What is the radius of the big red spot on the Moon?
A. 500 m B. 250 m C. 120 m D. 1.0 km E. 2.7 km
Physics & Space Science
Bright blue stars are typical of young ________ star clusters
Fill in the blank(s) with correct word
Physics & Space Science
Two charged bodies separated by a distance d exert an attractive electrical force on each other. The signs of the charges on the two bodies are __________ and __________
Fill in the blank(s) with correct word
Physics & Space Science