How many 176 ohm resistors are connected in series to get a current of 5 a on 220 v battey

Answers

Answer 1

Answer: Total resistance = voltage / current = 220 / 5 = 44 ohms .

Even one 176-ohm resistor is too much. The current through it is 1.25 A,
and more than one of them in series reduces the current even further.

Connecting them in parallel, however . . .

Four resistors of 176-ohms each, in parallel, have a net effective resistance
of 176/4 = 44 ohms ... exactly what you need to do the job.

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If you observed that an em wave had a wavelength of 10-12m, what sort of wave is it?

Answers

That's a radio wave at a frequency somewhere between 25 MHz and 30 MHz.

Which terrestrial planet experiences the shortest year?A. Mars
B. Earth
C. Venus
D. Mercury

Answers

D. Mercury
Its year only takes 88 Earth days.

BTW, you could get this exact information if you visit a revolutionary new search engine called Google. Enter in this exact question and Google will return the answer. :)

Also, you probably should know, the closer the planet is to the Sun, the faster it revolves around it, therefore it has a shorter year, and since Mercury is the first planet next to Sun it means that Mercury has the shortest year ☺

The layer of the Earth that is composed of large plates that interlock and move over time is the _______.asthenosphere
lithosphere
outer core
upper mantle

Answers

The layer of the Earth that is composed of large plates that interlock and move over time is the LitosphereLitosphere consist of several tectonic plates. The top part of the litosphere is Chemically reacts with the atmosphere in a soil forming process. IT's located between 0 - 6,500 Kilometers on the bottom of the surface

In the video this question was provided for, you should be able to find the passage, "The lithosphere is a rigid shell made up of plates. In order to understand what the plates are like, imagine taking a hard-boiled egg and cracking it all over. Do not peel it; just crack it. It is still all together on the outside of the egg, but it is broken into "plates." The plates of the lithosphere move slowly about on the plastic, formless asthenosphere beneath."

Answer: Lithosphere

What is the advantage of a gold leaf electroscope ?

Answers

It's to determine if there is a charge on an object/body or not and what kind of charge as well. Hope this can help!

What is the energy of a photon whose frequency is 6.0 x 10^20?(h=6.63 x10^-34 j•s; 1 eV=1.06x10^-19 J)

A. 1.6 MeV

B. 2.5 MeV

C. 3.3 MeV

D. 4.8 MeV

Answers

Answer:

3.75 MeV

Explanation:

The energy of the photon can be given in terms of frequency as:

E = h * f

Where h = Planck's constant

The frequency of the photon is 6 * 10^20 Hz.

The energy (in Joules) is:

E = 6.63 x10^(-34) * 6 * 10^(20)

E = 39.78 * 10^(-14) J = 3.978 * 10^(-13) J

We are given that:

1 eV = 1.06 * 10^(-19) Joules

This means that 1 Joule will be:

1 J = 1 / (1.06 * 10^(-19)

1 J = 9.434 * 10^(18) eV

=> 3.978 * 10^(-13) J = 3.978 * 10^(-13) * 9.434 * 10^(18) = 3.75 * 10^(6) eV

This is the same as 3.75 MeV.

The correct answer is not in the options, but the closest to it is option C.

A 4,000-kg car traveling at 20m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?

Answers

Rate of change of momentum = impact force
(m*v-m*u)/t = F
4000*20/t = 80000 (note: v is zero as it stopped)
soo, t = 1 sec

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