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Questions in physics

[Answered] What's mass? A) A measure of an element's attraction for electrons B) The force that gravity exerts upon an object C) The sum of the number of protons and neutrons in an atom D) A measure of the amount of matter an object contains

[Answered] Which two wire properties would provide the greatest resistance to the flow of a current? A. short, thin B. long, thin C. hot, thick D. cool, thick

[Answered] An identifiable, fixed position from which measurements can be taken is called: A. a measuring thingy. B. a reference point. C. global satellite positioning system. D. none of the above.

[Answered] Which statement accurately describes the relationship between mass and weight? A) An object with twice the mass of another object will weigh half as much. B) An object with twice the mass of another object will weigh one-fourth as much. C) An object with twice the mass of another object will weigh four times as much. D) An object with twice the mass of another object will weigh twice as much.

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] Which of the following options reports where the production of x-rays in an x-ray tube begins? A. photoelectric emission. B. field emission of electrons. C. thermionic emission. D. collision of electrons. Which of the following defines the Heisenberg's uncertainty principle for position and momentum? A. [tex]$\Delta x \Delta p \leq \frac{\hbar}{2}$[/tex] B. [tex]$\Delta x \Delta p=\frac{h}{2}$[/tex] C. [tex]$\Delta x \Delta p \geq \frac{\hbar}{2}$[/tex] D. [tex]$\Delta x \Delta p \geq 2 h$[/tex]

[Answered] Which would most likely have a direct effect on using wave power to generate electricity? A. rain B. clouds C. wind D. sunlight

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] How many hertz are in a yellow light with a frequency of [tex]$5.2 \times 10^8 MHz$[/tex]? Give your answer in proper scientific notation. [?] [tex]$\times 10^{[?]} Hz$[/tex]

[Answered] Select the correct answer. A ball hits a wall. What is true about the magnitude of the force experienced by the ball compared with the force experienced by the wall? A. The ball experiences more force than the wall. B. The ball experiences less force than the wall. C. The ball and the wall experience the same force. D. The ball experiences half the force of the wall.