What is kinetic energy?
a. The energy stored in a dry cell.
b. The energy an object has because of its position.
c. The energy an object such as a spring has because of its shape.
d. The energy an object has because of its motion.
e. The energy that two objects at rest have because of their gravitational attraction.
d
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A protostar becomes a main sequence star when it ________.
A. starts fusing helium B. starts glowing with infrared light C. starts fusing hydrogen to helium D. starts fusing heavier elements
The age of a star cluster can be determined from the ____________________ of the cluster
Fill in the blank(s) with correct word
The heliosphere is defined as the volume of space over which the ______________ extends
a. solar wind b. solar constant c. magnetic field d. gravitational field
Nanometer is a unit of _____
A) frequency B) energy C) mass D) length