If a star was the same size as our Sun, but was 81 times more luminous, it must be
A) twice as hot as our Sun.
B) three times hotter than the Sun.
C) four times hotter than the Sun.
D) nine times hotter than the Sun.
E) 81 times hotter than the Sun.
B
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A transverse periodic wave is represented by the equation y(x, t) = 2.50 cm cos(2,500 rad/s t - 15.0
x). What is the velocity of the wave?
A. 450 m/s in the - y direction B. 333 m/s in the + y direction C. 333 m/s in the + x direction D. 167 m/s in the - x direction E. 167 m/s in the + x direction
When a pair of 1-ohm resistors are connected in series, their equivalent (combined) resistance is 2 ohms, and when connected in parallel is
A) ½ ohm. B) none of the above C) also 2 ohms.
A 12.0-V battery (potential source) is connected across a 6.00-µF air-filled capacitor. (a) How much energy can be stored this way? (b) How much excess charge is on each plate of the capacitor?
What will be an ideal response?
What is a magnetosphere?
A) the uppermost layer of any planetary atmosphere B) the layer of a planet in which its magnetic field is generated C) the region in a planet's atmosphere in which auroras occur D) a region of space around a planet in which the planet's magnetic field can trap charged particles