Why does a battery get warm while in use?
1.Because of internal resistance, power is delivered to the battery material, raising its temperature.
2.The electrons in the wire build up inside the battery, thus heating it.
3.Batteries actually cool down when in use.
1
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_______________ is a network of canyons 4000km long and up to 600km wide on the surface of Mars
Fill in the blank(s) with correct word
Today, Mars has virtually no magnetic field
Indicate whether the statement is true or false
Select all of the following descriptions that match what happens when a ferromagnetic material is placed in an external magnetic field.
a. The ferromagnetic material rapidly cools. b. The ferromagnetic material becomes negatively charged. c. The ferromagnetic material becomes positively charged. d. The external magnetic field induces magnetic poles in the ferromagnetic material. e. The ferromagnetic material becomes magnetized. f. Nothing, ferromagnetic materials do not interact with magnetic fields.
A displacement vector D is given as 40.0 m long at an angle of 60.0 degrees NORTH of EAST. The 
component and the 
component of the vector are
A. 
= +34.6 m,
= +20.0 m.
B. = +20.0 m,
= -34.6 m.
C. 
= -34.6 m,
= +20.0 m.
D. 
= -34.6 m, 
= +20.0 m.
E. 
= +34.6 m, 
= -20.0 m.