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Questions in physics

📝 Answered - What is required in order to determine whether or not an object moves? A. a reference point B. distance C. displacement D. standard units

📝 Answered - How does heat differ from temperature? A. Temperature is the measure of heat. B. Temperature and heat are the same thing. C. Temperature measures thermal energy, and heat is the flow of thermal energy. D. Temperature measures the loss of energy, and heat measures the gain of energy.

📝 Answered - Which object has density closest to that of water? A. Earth B. Moon C. Mars D. Sun

📝 Answered - What is the current in the 30.0 A resistor? A. 4.00 A B. 32.0 A C. 2.00 A D. 30.0 A

📝 Answered - A wave has a frequency of 240 Hz and a wavelength of 3.0 m. What is the speed of the wave? Use [tex]V=f \times 2[/tex]. A. [tex]240 m / s[/tex] B. [tex]80 m / s[/tex] C. [tex]720 m / s[/tex] D. [tex]0.012 m / s[/tex]

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

📝 Answered - Indicate the direction of heat flow in each scenario. | Scenario | Object 1 | Object 2 | | :------- | :----------------------- | :----------------------- | | A | Lotion at $27^{\circ} C$ | Skin at $37^{\circ} C$ | | B | Lasagna at $170^{\circ} C$ | Plate at $20^{\circ} C$ | | C | Ocean water at $25^{\circ} C$ | Lava at $950^{\circ} C$ | | D | Eggs at $2^{\circ} C$ | Sidewalk at $80^{\circ} C$ | Scenario A: $\square$ Scenario B: $\square$ Scenario C: $\square$ Scenario D: $\square$

📝 Answered - Measurements of two electric currents are shown in the chart. Electric Currents | Current | Volts | Amperes | | :------ | :---- | :------ | | X | 1.5 | 7.8 | | Y | 9 | 0.5 | Which best compares the two currents? A. Current X has a greater potential difference, and the charges flow at a slower rate. B. Current Y has a greater potential difference, and the charges flow at a slower rate. C. Current X has a greater potential difference, and the charges flow at a faster rate. D. Current Y has a greater potential difference, and the charges flow at a faster rate.

📝 Answered - Which best describes a difference between electric current and static electricity? A. Electric current is continuous, and static electricity is not continuous. B. Static electricity is continuous, and electric current is not continuous. C. Electric current involves the movement of electrons, and static electricity involves the movement of protons. D. Static electricity involves the movement of electrons, and electric current involves the movement of protons.

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