Mean Life: The half-life of arsenic-76 is 26.7 h. What are its (a) decay constant and (b) mean life?
What will be an ideal response?
(a) 0.0260 h-1 (b) 38.5 h
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Shapley found the distance to the center of the galaxy by studying the distance to open clusters
Indicate whether the statement is true or false
The equation E = mc2 means that
A. mass and energy when combined travel at the speed of light. B. energy is really mass traveling at the speed of light squared. C. mass is really a bundle of energy traveling at the speed of light. D. energy and mass are different forms of the same thing. E. mass and energy when combined travel at twice the speed of light.
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?5.5 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m b. 28 m c. 44 m d. 12 m e. 88 m
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The force F2 in pounds needed to keep piston 2 in place is a. 0.25. b. 0.4. c. 4. d. 10. e. 40.