Based on current evidence and models, the total amount of matter (both luminous matter and dark matter) represents approximately what percentage of the total mass and energy of the universe?
A) about 1 percent
B) about 10 percent
C) about 30 percent
D) about 50 percent
E) 100 percent
C) about 30 percent
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Arrange the following distances in order from smallest to largest. I. kilometer II. light-year III. yard IV. astronomical unit
a. I, II, III, IV b. IV, III, II, I c. III, I, IV, II d. II, I, IV, III e. III, I, II, IV
A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 ?V b. 18 ?V c. 31 ?V d. 24 ?V e. 21 ?V
The distance between the ruled lines on a grating is 1900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the angular width of the gap between the first order spectrum and the second order spectrum? A) 3.3° B) 4.3° C) 5.3° D) 6.3° E) 2.3°
The position of a 0.76-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (?t/16). What is the maximum net force on the mass as it oscillates?
a. 4.7E–3 N b. 2.9E–2 N c. 6.2E–3 N d. 2.4E–2 N e. 2.4E–2 N