What is spacetime?
A) It's the inseparable combination of space and time.
B) It's time that we measure when traveling in space.
C) It's a graph with four axes.
D) It's a way of viewing books at different angles.
A) It's the inseparable combination of space and time.
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What happens to the atomic number (Z) and the mass number (A) when a nucleus emits an alpha particle?
a. Z increases by 1; A is unchanged. b. Z is unchanged; A is unchanged. c. Z decreases by 2; A decreases by 4. d. Z decreases by 1; A is unchanged.
Fusion employs the lightest nuclei because
A. fusion produces a nucleus whose binding energy per nucleon is smaller than that of the two parent nuclei. B. they are more plentifully available. C. they are easier to completely ionize and thus cause their nuclei to coalesce. D. fusion produces a nucleus whose binding energy per nucleon is larger than that of the two parent nuclei.
You push downward on a trunk at an angle 25° below the horizontal with a force of 750N If the trunk is on a flat surface and the coefficient of static friction between the surface and the trunk is 0.61,
what is the most massive trunk you will be able to move? A) 81 kg B) 73 kg C) 112 kg D) 93 kg
The energy gap for germanium is 0.670 eV at room temperature. What wavelength must a photon have (in nm) to excite the electron to the conduction band?
a. 640 b. 1 090 c. 1 850 d. 2 200 e. 925