Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 50 Mpc away would have a recession velocity of _______________ km/s. (Round your answer to the nearest 1 km/s)
Fill in the blank(s) with correct word
3500
3,500
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Motional Emf: A conducting rod whose length is ? = 1.60 m is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 4.00 ? as shown in the figure. The rails and the rod are in the plane of the page. A constant uniform magnetic field of strength 2.20 T is applied perpendicular to and out of the paper. An external applied force moves the rod to the right with a constant speed of 6.00 m/s. At what rate is energy dissipated in the lightbulb?
A. 60.0 W B. 121 W C. 21.2 W D. 112 W E. 11.5 W
The thin lens equation relates the focal length of a lens or mirror to
A. The object distance and the magnification B. The image distance and the magnification C. The object distance and the image distance D. The radius of curvature of both sides of a lens.
Compounds containing only carbon and hydrogen are known as ______________
Fill in the blank(s) with correct word
The minimum energy needed to produce a positron is
a. 3 MeV b. 2 MeV c. 1 MeV d. 4 MeV e. 0.51 MeV