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Questions in physics

[Jawaban] We know there is matter that cannot be seen by any means available to us, including the different wavelengths of the electromagnetic spectrum. Yet we know this so-called "dark matter" exists. How? A. Black holes have consumed much of the matter that once existed. B. At the origin of the universe, there was a large amount of antimatter that became hidden. C. Einstein's equation shows us the equivalence of energy that could also be considered matter. D. The spins of galaxies cannot be explained by the amount of known, ordinary matter.

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

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

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

[Jawaban] 1. Energy absorption in a crash is directly dependent on A. vehicle speed. B. angles of collision. C. areas of vehicle contacts. D. all of the above 2. In a motor vehicle crash, as a car crushes, it absorbs some of the force of the collision. A. TRUE B. FALSE 3. If your speed triples, you need A. nine B. seven C. five D. three times the distance to stop.

[Jawaban] Under what condition is average velocity equal to instantaneous velocity?

[Jawaban] Name five scientific models that explain the structure of the atom.

[Jawaban] In the stages of nuclear fusion inside stars, which element in the list is the ultimate building block for all the others? A. hydrogen B. helium C. carbon D. oxygen

[Jawaban] Select the correct answer. What is the momentum of a 76-kilogram horse running at a speed of 45 kilometers/hour? A. $2.5 \times 10^2$ kilogram-meters/second B. $3.4 \times 10^4$ kilogram meters/second C. $3.4 \times 10^3 kilogram$-meters/second D. $9.5 \times 10^2$ kilogram-meters/second

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