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Questions in physics

[Homework Help] A coil is connected to a 100V DC supply and takes a current of 10A. Calculate the value of the resistance of the coil.

[Homework Help] One car travels east for 360 meters over a period of 15 seconds. A second car travels west for 120 meters over a period of 5 seconds. What is true about their speeds? What is true about their velocities?

[Homework Help] In a grassland ecosystem, if the population of eagles suddenly decreased, what will most likely be the effect on the rest of the ecosystem? A. The ecosystem will become overpopulated with snakes. B. There will be a decrease in the population of snakes in the ecosystem. C. The nutrition of the soil in the ecosystem will decrease. D. More types of plants will begin growing in the ecosystem.

[Homework Help] Why are forces balanced and unbalanced? Please help with this; the lesson is tomorrow.

[Homework Help] Which explanation of the solar system best fits the observations of the planets and how they orbit the sun? A. The gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets. B. The planets formed at the center of a collapsing spinning cloud of gas and dust. C. The sun and planets formed from a collapsing spinning cloud of gas and dust. D. A comet hit the sun and sent off fragments that became the planets.

[Homework Help] What must occur before clouds can form?

[Homework Help] When a bicycle rider puts on the brakes, friction causes some of the mechanical energy to change into what type of energy?

[Homework Help] What two factors affect gravity, and how do they influence it?

[Homework Help] How do contact forces, such as friction, differ from gravitational and magnetic forces?

[Homework Help] can someone please help with this page