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Questions in physics

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

[Homework Help] The human eye is sensitive to photons from which region of the sun? A. Photosphere B. Radiation zone C. Convection zone D. Core

[Homework Help] In a nuclear fission reaction, what is the role of a neutron? A. Initiating the chain reaction by exploding by itself B. Initiating the chain reaction by stabilizing the nucleus C. Initiating the chain reaction by preventing radioactive decay D. Initiating the chain reaction by smashing into the atom E. Initiating the chain reaction by carrying away the released energy F. Initiating the chain reaction by absorbing excess energy of the reaction

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

[Homework Help] How would you change the distance between two positively charged particles to increase the electric potential energy by a factor of 4? A. Increase the distance by a factor of 4. B. Increase the distance by a factor of 16. C. Reduce the distance by a factor of 4. D. Reduce the distance by a factor of 16.

[Homework Help] What happens when an electronic emission occurs? A. Light leaves an electron and it jumps from a low to a high energy level (away from the nucleus). B. Light leaves an electron and it drops from a higher to a lower energy level (toward the nucleus). C. Light hits an electron and it jumps from a low to a high energy level (away from the nucleus).

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

[Homework Help] Which part of visible light transfers the most energy? A. red B. blue C. green D. yellow

[Homework Help] The volume of an object is equal to the ratio of its mass to density, [tex]V = \frac{\%}{6}[/tex]. The mass of a spherical grape is 8.4 grams and its density is 2 grams per cubic centimeter. What is the radius of the grape? Round to the nearest length of a centimeter. 1.0 cm 1.5 cm 2.1 cm 1.9 cm

[Homework Help] Which explains the information needed to calculate speed and velocity? A. Both require the total distance, but velocity also requires time and displacement. B. Both require time, but velocity requires displacement and speed requires distance. C. Speed requires displacement, while velocity requires distance. D. Speed does not require time, while velocity does require time.