When four hydrogen are fused to make one helium nuclei, a small amount of matter is converted into what?
a. photons b. other matter
c. energy d. gamma rays, neutrinos, and positrons
c
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The amount of gravitational potential energy released as an object falls depends on
A) its mass and the distance it falls, as well as the rate of gravitational acceleration. B) its mass and its speed at the time it begins falling. C) only the distance it falls. D) only its mass. E) only its speed at the time it begins falling.
A hydrogen atom is in its n = 2 excited state when its electron absorbs a photon of energy 8.5 eV. What is the energy of the resulting free electron?
The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 5.1 eV B) 6.6 eV C) 6.9 eV D) 7.6 eV
You are driving a late model convertible at the 55 mph limit with its soft ragtop roof up and the windows closed. You observe that the roof
A) bows inward. B) is not changed from when the car was at rest. C) bows outward. D) bows inward only when you are driving uphill. E) bows inward only when you are driving downhill.
The current in a circuit flows in the opposite direction to the direction in which the electrons move
Indicate whether the statement is true or false