In a dream you're in a car traveling at 50 km/h and you bump into another car traveling toward you at 48 km/h. The speed of impact is
A) 48 km/h.
B) 50 km/h.
C) 98 km/h.
D) 2400 km/h.
Answer: C
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The diagram below shows three approximate locations of the sun along the western horizon. Which number indicates the location of the sun at sunset on autumnal equinox for an observer at a latitude of 45° N?
a. 1
b. 2
c. 3
d. The sun will set in the east for an observer in the northern hemisphere.
e. The sun will not set on autumnal equinox at this latitude.
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force exerted on a charged object is proportional to its speed.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forcesWhich of the following web video formats is a common format used by digital video cameras?
A. .avi B. .mov C. .mpeg D. .wmv
Which statement regarding the force of a magnetic field on a current-carrying wire is true?
a. The magnetic force on the wire is independent of the direction of the current. b. The force on the wire is directed parallel to both the wire and the magnetic field. c. The force takes its largest value when the magnetic field is parallel to the wire. d. All of the above statements are false.