Suppose you live at latitude 20°S. Based on the given right ascensions and declinations, which of the following stars passes closest to your zenith on its daily path through your sky?
A) Sirius: RA = 6hr 45m, dec = -16°42'
B) Canopus: RA = 6hr 24m, dec = -52°41'
C) Alpha Centauri: RA = 14hr 40m, dec = -60°50'
D) Arcturus: RA = 14hr 16m, dec = +19°11'
E) Vega: RA = 18hr 37m, dec = +38°47'
A) Sirius: RA = 6hr 45m, dec = -16°42'
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A parallel-plate capacitor has plates of area 0.40 m2 and plate separation of 0.20 mm
The capacitor is connected across a 9.0-V potential source. (?0 = 8.85 × 10-12 C2/N ? m2) (a) What is the magnitude of the electric field between the plates? (b) What is the capacitance of the capacitor? (c) What is the magnitude of the charge on each plate of the capacitor?
Rotational Kinetic Energy: The L-shaped object shown in the figure consists of three small masses connected by extremely light rods. Assume that the masses shown are accurate to three significant figures. How much work must be done to accelerate the object from rest to an angular speed of 3.25 rad/s (a) about the x-axis, (b) about the y-axis?
Fill in the blank(s) with the appropriate word(s).
A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m?, what is the magnetic force on the moving bar?
a.
0.48 N to the right
b.
0.48 N to the left
c.
0.32 N to the left
d.
0.32 N to the right
e.
None of the above
The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?
a. first c. third b. second d. fourth