Physics, 13.06.2021 22:50 sweetiezylp8umho

Một quả cầu kim loại có bán kính R= 20cm, mang điện tích q = 4.10 -7 C phân bố đều, đặt trong không khí. Hãy xác định:
a) Mật độ điện mặt của quả cầu.
b) Năng lượng điện trường của quả cầu tích điện.

Answers: 2

Show answers

Another question on Physics

Physics, 22.06.2019 12:00

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

Answers: 1

Answer

Physics, 22.06.2019 12:20

What is the coefficient of kinetic friction μk between the block and the tabletop?

Answers: 1

Answer

Physics, 22.06.2019 14:30

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

Answers: 3

Answer

Physics, 22.06.2019 19:50

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.

Answers: 3

Answer

You know the right answer?

Một quả cầu kim loại có bán kính R= 20cm, mang điện tích q = 4.10 -7 C phân bố đều, đặt trong không...

Questions