What is the standard Hz rate (cycles per second) in the US?<br> 20 Hz<br> 80 Hz<br> 60 Hz<br> 50 Hz

Where is the magnet that causes Earth’s magnetic field? What is this magnet made of?

Y_Kistochka [10]

Answer:

The magnetic field of Earth is created by currents of electricity that flow in the molten center.

Explanation:

6 0

3 years ago

Dont use me for points please i need help, (circuits for physics)

zhannawk [14.2K]

Answer:

B, A, A, B

Explanation:

Just trust me on this one.

3 0

2 years ago

Electrons are emitted from a surface when light of wavelength 500 nm is shone on the surface but electrons are not emitted for l

liberstina [14]

Explanation:

Given: $\lambda = 500\:\text{nm} = 5×10^{-7}\:\text{m}$

$\nu = \dfrac{c}{\lambda} = \dfrac{3×10^8\:\text{m/s}}{5×10^{-7}\:\text{m}}$

$\:\:\:\:\:= 6×10^{14}\:\text{Hz}$

The work function $\phi$ is then

$\phi = h\nu = (6.626×10^{-34}\:\text{J-s})(6×10^{14}\:\text{Hz})$

$\:\:\:\:\:\:\:= 3.98×10^{-19}\:\text{J}$

3 0

2 years ago

A string is stretched by two equal and opposite forces F newton each then the tension in sting is?

Arlecino [84]

Answer: The tension in the string is zero

Explanation:

3 0

3 years ago

The force attraction between two objects, does what, as the distance between them increases?

gregori [183]

Decreases

Explanation:

The force of attraction between two objects will decrease as the distance between them increases.

This is in compliance with newtons law of universal gravitation.

The force of attraction between the two bodies is a gravitational force.

According to newton's law of universal gravitation "the force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distances between them".

We see that from the last statement, the force of attraction between is inversely proportional to the square of the distances between them.

F ∞ $\frac{1}{r^{2} }$

r is the distance between them.

learn more:

Universal gravitation brainly.com/question/1724648

#learnwithBrainly

3 0

3 years ago

What is the standard Hz rate (cycles per second) in the US? 20 Hz 80 Hz 60 Hz 50 Hz