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3 years ago

HELP ASAP!!!! Which statement describes a property of magnets?

Physics

2 answers:

ankoles [38]3 years ago

7 0

I think the answer is <span>4)Magnets attract or repel other magnets.</span>

Veronika [31]3 years ago

7 0

<h3><u>Answer;</u></h3>

<em>4) Magnets attract or repel other magnets.</em>

<h3><u>Explanation;</u></h3>

<em><u>Magnets are materials that have the capability of generating magnetic fields.</u></em> They repel non-magnetic materials such as wood, plastic etc. and attract magnetic material such as iron and steel.
<em><u>Magnets may attract or repel each other based on the basic law of magnetism which states that like poles repel and unlike poles attract</u></em>. Therefore, when two north poles of different magnets are brought together they repel, while north pole will attract south pole of another magnet.

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What is the velocity of an electron that has a de Broglie wavelength approximately the length of a chemical bond? Assume this le

melomori [17]

Answer : The velocity of an electron is, $6.1\times 10^{6}m/s$

Explanation :

According to de-Broglie, the expression for wavelength is,

$\lambda=\frac{h}{p}$

and,

$p=mv$

where,

p = momentum, m = mass, v = velocity

So, the formula will be:

$\lambda=\frac{h}{mv}$ .............(1)

where,

h = Planck's constant = $6.626\times 10^{-34}Js$

$\lambda$ = wavelength = $1.2\times 10^{-10}m$

m = mass of electron = $9.11\times 10^{-31}kg$

v = velocity of electron = ?

Now put all the given values in formula 1, we get:

$1.2\times 10^{-10}m=\frac{6.626\times 10^{-34}Js}{(9.11\times 10^{-31}kg)\times v}$

$v=6.1\times 10^{6}m/s$

Thus, the velocity of an electron is, $6.1\times 10^{6}m/s$

6 0

3 years ago

A 9.0 kg test rocket is fired vertically from Cape Canaveral. Its fuel gives it a kinetic energy of 1905 J by the time the rocke

mrs_skeptik [129]

Answer:

21.6m

Explanation:

Since the rocket engine burns all the fuel hence the kinetic energy will be converted to potential energy

Potential Energy = mass × acceleration due to gravity × height

Given

PE = 1905J

Mass = 9.0kg

Acceleration due to gravity =9.8m/s²

Required

Height h

Substitute into the formula

1905 = 9(9.8)h

1905 = 88.2h

h =1905/88.3

h = 21.6m

Hence the required height is 21.6m

5 0

3 years ago

If you unbend a paper clip made from 1.5 millimeter diameter wire and push one end against the wall, what force must you apply t

vampirchik [111]

Answer:

The force is $F = 21.48 \ N$

Explanation:

From the question we are told that

The diameter of the wire is $d = 1.5 \ mm = 1.5 *10^{-3} \ m$

The pressure is $P = 120 \ a.t.m = 120 * 101.3 *10^{3} = 12156000 Pa$

Generally the radius of the of the wire is

$r = \frac{d}{2}$

=> $r = \frac{ 1.5 *10^{-3}}{2}$

=> $r = 7.5 *10^{-4} \ m$

The Area is evaluated as

$A = \pi r^2$

=> $A = 3.142 * 7.5 *10^{-4}$

=> $A = 1.7673*10^{-6} \ m^2$

Generally pressure is mathematically represented as

$P = \frac{F}{A }$

=> $F = P* A$

=> $F = 12156000 * 1.767*10^{-6}$

=> $F = 21.48 \ N$

6 0

3 years ago

When a potential difference of 10 V is placed across a certain solid cylindrical resistor, the current through it is 2 A. If the

DaniilM [7]

Answer:

Current would decrease 9 times.

Explanation:

Assume all others (potential difference U, resistivity ρ, and length L) are the same, only change in the diameter, we would have the following ratio

$\frac{I_1}{I_2} = \frac{U/R_1}{U/R_2} = \frac{U}{U}\frac{R_2}{R_1} = \frac{\rho L/A_2}{\rho L / A_1} = \frac{\rho L}{\rho L}\frac{A_1}{A_2} = \frac{\pi d_1^2/4}{\pi d_2^2/4} = \frac{4\pi}{4\pi}\left(\frac{d_1}{d_2}\right)^2 = 3^2 = 9$

$I_2 = I_1/9$

So the current would decrease 9 times.

7 0

3 years ago

Examples of rotating and revolving objects and an objects that does both

Nina [5.8K]

Rotating- a Ferris wheel
Revolving- the revolving door
Object the does both- earth

3 0

3 years ago