A galvanometer measures
A) magnetic fields.
B) electric current.
C) electric voltage.
D) none of the above
Answer: B
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When two objects at different temperatures are placed in thermal contact, heat flows
A. only if both objects are at the same temperature B. from the higher temperature object to the lower temperature object C. from the lower temperature object to the higher temperature object
A parallel-plate capacitor has a capacitance of 10 mF and is charged with a 20-V power supply
The power supply is then removed and a dielectric material of dielectric constant 4.0 is used to fill the space between the plates. What is the voltage now across the capacitor? A) 2.5 V B) 10 V C) 5.0 V D) 80 V E) 20 V
Which is characteristic of globular star clusters?
A) a mix of old and young stars, about 100,000 ly across B) old age and hundreds of thousands of stars, only about 30 ly wide C) bright blue main sequence stars, and thousands of them D) only brown dwarfs in a yellow ball 100 ly across E) no remaining main sequence stars, but millions of white dwarfs
Equilibrium: The mobile shown in the figure is perfectly balanced, and the horizontal supports have insignificant masses. What must be the masses of the suspended objects m1, m2, and m3 to maintain balance?
What will be an ideal response?