Compared with the spectral lines in the solar spectrum, lines in a supergiant spectrum are
a. sharper.
b. broader.
c. weaker.
d. stronger.
e. broader and weaker.
a
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In order for you to get out of bed with the least amount of work, would it be better for your bed to be on the floor or a meter high?
A) It makes no difference, because you must change your position from lying down to standing up in either case. B) It makes no difference, because the total amount of physical work done in either case is zero. C) Both of the above. D) It would be better for the bed to be on the floor, because then you would not need to do as much work to get your feet down onto the floor. E) It would be better for the bed to be a meter high, because then you would not need to do as much work in lifting yourself to your feet.
Parallel Wires: Two parallel straight wires are 7.0 cm apart and 50 m long. Each one carries a 18-A current in the same direction. One wire is securely anchored, and the other is attached in the center to a movable cart. If the force needed to move the wire when it is not attached to the cart is negligible, with what magnitude force does the wire pull on the cart? (?0 = 4? × 10-7 T ? m/A)
A. 46 mN B. 37 mN C. 66 mN D. 93 mN
A displacement vector is 34.0 m in length and is directed 60.0° east of north. Selecting from the choices in the table below, what are the components of this vector?
Northward Eastward choice component component 1 29.4 m 17.0 m 2 18.2 m 28.1 m 3 22.4 m 11.5 m 4 17.0 m 29.4 m 5 25.2 m 18.2 m A) choice 1 B) choice 2 C) choice 3 D) choice 4 E) choice 5
The resistance of matter to changes in motion is known as _______________
Fill in the blank(s) with correct word