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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] How often does Earth's magnetic field change direction? A) About every one million years B) About every three million years C) About every two million years D) About every four millions years

[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] Dimas reads that it takes 270 N to lift a firefighter's equipment. If a firefighter does 5400 J of work carrying the equipment up a staircase, how high does the firefighter climb? (Work: W = Fd) A. 20 m B. 200 m C. 5130 m D. $1,458,000 m$

[Homework Help] Anya recorded the temperatures of four different smooth materials after they were placed under a heat lamp for thirty minutes. | Material | Temperature (°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 these prevents conduction from occurring? A. equal masses B. different masses C. equal temperatures D. different temperatures

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

[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] Phosphorus -32 (P-32) can decay by emitting beta particles. (a) What is a beta particle? A high-energy, high-speed electron or positron emitted from an atom's nucleus during beta decay. (b) If the proton number of phosphorus -32 is 15: i) State the new values of proton and mass number of the nuclide just after it emits a beta particle. ii) Write the decay equation for P-32 after emitting two beta particles. (c) Phosphorus -32 can be used to prove that plants absorb phosphorus nutrients from the soil around them. State one safety precaution which should be taken into consideration when doing experiments with phosphorus -32.