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4 years ago

PLEASE HELP ME!!!

Physics

1 answer:

love history [14]4 years ago

3 0

B.wrap more coils of wire around nail
this is the answer because the more coils the stronger the electrmagnet

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A long thin rod of mass M and length L is situated along the y axis with one end at the origin. A small spherical mass m1 is pla

Yuri [45]

Answer:

$= - 5.65\times 10^{-2} J$

Explanation:

Given data:

L =2.00 *10^4 m

d = 18*10^4 m

M = 18 *10^6 kg

m_1 = 8*10^6 kg

Gravitational energy is given as

$U =- G \frac{m_1 m_2}{r}$

mass per unit length is given as

$\sigma = \frac{M}{L} = \frac{18 \times 10^6}{2\times 10^4 m} = 900 kg/m$

calculating potential energy

$dU ==-G\int_{16\times 10^4}^{18\times 10^4} \frac{m_1 *dm}{r}$

$=-G\int_{16\times 10^4}^{18\times 10^4} \frac{m_1 *\sigma dr}{r}$

$=-G*m_1*\sigma\int_{16\times 10^4}^{18\times 10^4} \frac{dr}{r}$

$=-G*m_1*\sigma \left | ln r \right |_{16\times 10^4}^{18\times 10^4}$

$=-G*m_1*\sigma ln(1.125)$

$=-6.673 \times 10^{-11}*8*10^6*900*ln(1.125)$

$= - 5.65\times 10^{-2} J$

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3 years ago

Dr. Grey performed an experiment to test how temperature affects activity levels in mice. She put one group of mice in a cold en

katen-ka-za [31]

Answer:

answer is A

Explanation:

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3 years ago

What is electrical power? how to measure power?

konstantin123 [22]

Answer:

Electric power is the rate at which work is done or energy is transformed in an electrical circuit.

P = W/t

Explanation

Where P is Power,

W is work

t = Time passed

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4 years ago

A battery of constant voltage is connected to a variable resistor. As the resistance of the resistor increases, what happens to

vova2212 [387]

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3 years ago

Which statement best explains why the overall charge on an atom is zero?

deff fn [24]

This indicates nucleus of an atom constantly positively charged. an atom has an nuteral overall charge because it has the same amount of electrons as protons

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4 years ago

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