How is the age of a rock determined?
A. by counting the number of circles just like the circles on the trunk of a tree
B. by measuring the amount of calcium it contains
C. by measuring the temperature of the rock
D. by determining the ratio of argon to potassium
Answer: D
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A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram?
A. 49 N
B. 98 N
C. 196 N
D. Other (specify
An M star is hotter than an O star
Indicate whether the statement is true or false
Which of these is a reason for using mirrors rather than lenses in telescopes?
A. Lenses can only be supported by their edges, making them sag in the middle (mirrors can be supported from behind). B. Most transparent materials focus light of different colors to different spots. C. Lenses are more expensive to make than mirrors. D. All of these choices are correct.
An airplane moves 140 m/s as it travels around a vertical circular loop which has a 1.0-km radius. What is the magnitude of the resultant force on the 70-kg pilot of this plane at the bottom of this loop?
a. 2.1 kN b. 1.4 kN c. 0.69 kN d. 1.5 kN e. 1.3 kN