Recent content by Humbleness

The magnet field of a bar magnet is strongest near the poles. As the poles approach the coil, the field will increase in strength. If the magnetic field increases rapidly, then the induced current will be stronger. I think this would answer the third question. Thank you for your help!

Homework Statement Look at the following diagram: - copy the diagram and then label the poles for the induced magnetic field and the direction of the induced current - explain what would happen to the magnetic field and the current if the direction of motion of the magnet reversed - explain...

Thank you for your help, I understand now! :smile:

I am confused over the 2 hours each though... Would that mean that one coffee-maker runs on 120 V for 2 hours, as well as the second? So my total time should actually be 4h? ΔE = PΔt = 1.92 kW x 4h = 7.68 kWh

Hmm makes sense. Therefore, P = V2 / R = 1202 / 15 = 960 W or 0.96 kW Then I would multiply this by 2, since there are two coffee-makers? 0.96 x 2 = 1.92 kW ΔE = PΔt = 1.92 kW x 2h = 3.84 kWh

Homework Statement Two 15Ω coffee-makers are connected to a 120V power supply for two hours a day each. Find the power and energy. Homework Equations P=V2/R ΔE=PΔt The Attempt at a Solution I am assuming, since there are two coffee-makers connected to one 120V power supply, that: P = V2/R =...

My attempt at the question... If 50% = 5730 years 1% = 114.6 years 2% = 229.2 or approximately 230 years 5730 - 230 = 5500 years Therefore, 5500 years before 1991 (The year Iceman was discovered), meaning 5500-1991 = 3509 years or 3510 BC approximately Would this be good?

I was studying nuclear fusion and fission, their differences and reactions, and calculating the energy. My textbook had similar examples and questions with suggested answers: So I was following this example, to calculate this question. Do you still think it is incorrect? I just want to make...

Homework Statement In the following fusion reaction, a deuterium nucleus (D) combines with a tritium nucleus (T) to form a helium nucleus (He-4). If the following masses of deuterium and tritium are used to produce energy, calculate the total amount of energy produced. Homework Equations E =...

Which is exactly what I ended up doing. Thank you so much for your help. :smile:

Understood, even though I was following this table in my textbook: However, I have calculated again using your advice, and rounded up to exactly 1418s in my calculations. I don't think the teacher marking will expect me to know of 3.34 x 105 May I ask from where did you find that info? I could...

Makes sense, as the question stated from when the ice starts melting... That would lead to 1255s + 150s = 1405s Does this look better?

Homework Statement A 0.25 kg piece of ice at -30 C is warmed by an electric heater and the following graph of temperature is produced. Assume that there has been no loss of energy to the surroundings. - Use the info on the graph to determine the power output of the heater - Explain how long...

The cable exerts an upward force. I concur with you on the 0.5m/s2 After redoing the calculations I came with the results: The velocity of the elevator 12.0s after the passengers enter it is 6.0 m/s2 The force normal acting on the 35 kg passenger will be 360.5 N It isn't a big difference, but...

Therefore, if I have understood you correctly, what you are saying is that 0.50m/s2 is the most accurate acceleration of the elevator? And that 12000 N might be the most accurate upward force? Would you mind reiterating?