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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] What is the electric potential halfway between a charge of 7.25x10-9 C and another of 4.00x10-9 C charge separated by 100.0 cm?

[Homework Help] How are electromagnetic waves different than all other waves? A. They can be transmitted. B. They can be reflected. C. They can vibrate matter. D. They can travel through space.

[Homework Help] What is the mass of a crate if a force of 200 N causes it to accelerate at [tex]$8 m / s ^2$[/tex]? (Formula: [tex]$F= ma$[/tex])

[Homework Help] What is electric current? A. Electrons that move one time B. The flow of moving electrons

[Homework Help] Anya recorded the temperatures of four different smooth materials after they were placed under a heat lamp for thirty minutes. | Material | Temperature (${ }^{\circ} F$) | | -------- | ----------------------------- | | W | 87 | | X | 99 | | Y | 75 | | Z | 105 | Which conclusion is best supported by the information in the chart? A. Material W is less absorbent than material Z. B. Material $Y$ is the least reflective. C. Material X is more reflective than material W. D. Material Z is the least absorbent.

[Homework Help] Which of the following factors would affect circuit characteristics on the human body in the event of electrical shock? Select all that apply. A. Current B. Resistance C. Frequency D. Voltage

[Homework Help] Identify each region of the electromagnetic spectrum by correctly placing the names listed. A. Infrared B. Radio Ultraviolet Gamma ray X-ray Microwave

[Homework Help] Which is the best term to use when describing the energy of motion? A. chemical B. kinetic C. potential D. thermal

[Homework Help] What is the weight, on Earth, of a book with a mass of 1.5 kg? A. 1.5 N B. 6.5 N C. 11.3 N D. 14.7 N