An airplane with a wingspan of 79.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.490 × l0?4 T. If the induced potential between wingtips is 0.875 V, what is the plane's speed?
a. 54.3 m/s
b. 33.9 m/s
c. 226 m/s
d. 17 900 m/s
e. 111 m/s
c
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An insulator has a negative electric charge of 2.4 × 10^ -17 C. How many electrons were added or removed?
a. 150 electrons removed b. 67 electrons removed c. 150 electrons added d. 67 electrons added
Graphical Addition: If 
- 
= 0, then the vectors 
and 
have equal magnitudes and are directed in the same direction.
A. True B. False
Weight and g: By how many newtons does the weight of a 100-kg person decrease when he goes from sea level to mountain top at an altitude of 5000 m? The mean radius of the earth is 6.38 × 106 m.
A. 0.60 N B. 1.5 N C. 2.6 N D. 3.6 N E. 9.8 N
Critical thinking is the process of:
a. finding fault in yourself b. unconditionally accepting information from a trusted source c. designing a scientific experiment d. making a hypothesis e. judging the quality of information before accepting it