Star X has an apparent magnitude of 6, and star Y has an apparent magnitude of 2. How do they compare in observed brightness?
A) Star X appears brighter in the night sky than star Y.
B) Star Y appears brighter in the night sky than star X.
C) Star X is farther away from us than star Y.
D) Star Y is farther away from us than star X.
B) Star Y appears brighter in the night sky than star X.
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A bicycle wheel of radius 0.36 m and mass 3.2 kg is set spinning at 4.00 rev/s. A very light bolt is attached to extend the axle in length, and a string is attached to the axle at a distance of 0.10 m from the wheel
Initially the axle of the spinning wheel is horizontal, and the wheel is suspended only from the string. We can ignore the mass of the axle and spokes. At what rate will the wheel process about the vertical? A) 2.9 rpm B) 1.9 rpm C) 18 rpm D) 0.30 rpm E) 0.77 rpm
Reasonable values for the absolute ages of sedimentary rocks are frequently determined by relating them to ______________ rocks whose absolute ages have been determined
Fill in the blank(s) with correct word
A ray of light, which is traveling in air, is incident on a glass plate at a 45° angle. The angle of refraction in the glass
A) is less than 45°. B) is greater than 45°. C) is equal to 45°. D) could be any of the above; it all depends on the index of refraction of glass.
A particle (m = 2.0 mg, q = -5.0 mC) has a speed of 30 m/s at point A and moves (with only electric forces acting on it) to point B where its speed is 80 m/s. Determine the electric potential difference VA - VB
a. -2.2 kV b. +1.1 kV c. -1.1 kV d. +2.2 kV e. +1.3 kV