When radium-223 (Z = 88) decays to radon-119 (Z = 86), an alpha particle is emitted
a. True
b. False
Indicate whether the statement is true or false
True
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This painting represents the Sun and planets (and two dwarf planets) of our solar system. What is not to scale in this painting?
A) The sizes of the planets are not correctly scaled compared to each other or the Sun. B) The distances between the planets are not shown to scale. C) The Sun is too big compare to the planets. D) Everything is correctly scaled, but the planets are shown in the wrong order from the Sun. E) Neither distances nor sizes are correctly scaled.
Two resistors of 15 and 30 ? are connected in parallel. If the combination is connected in series with a 9.0-V battery and a 20-? resistor, what is the current through the 15-? resistor?
A) 0.10 A B) 0.13 A C) 0.20 A D) 0.26 A E) 0.32 A
A 2.0-kg object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0-kg object moving with a speed of 2.0 m/s in the same direction. How much kinetic energy is lost in this collision?
a. 2.4 J b. 9.6 J c. 5.4 J d. 0.6 J e. 6.0 J
This graph shows the adjustment factor versus the ratio of the speed of the system or object to the speed of light. The graph implies that, if travel at speed c were possible, a clock traveling at the speed of light would stop
a. True. b. False. c. It is impossible to know.