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3 years ago

15

The movement of the liquid in a thermometer shows changes in temperature. An increase in temperature indicates the molecules in

the liquid *

1 answer:

ahrayia [7]3 years ago

7 0

Answer:

The movement of the liquid in a thermometer shows changes in temperature. An increase in temperature indicates the molecules in the liquid *

Explanation:

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Suppose you increase your walking speed from 7 m/s to 11 m/s in a period of 1 s. What is your acceleration?

QveST [7]

Your acceleration would be four

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3 years ago

A horizontal circular wire loop of radius 0.7 m lies in a plane perpendicular to a uniform magnetic field that is pointing down

Maru [420]

Answer:

$\epsilon=1.10\ V$

Explanation:

It is given that,

Radius of the circular loop, r = 0.7 m

Magnetic field, B = 0.44 T

In 0.14 s the wire is reshaped from a circle into a square, but remains in the same plane.

Area of the circular wire,

$A_1=\pi r^2$

$A_1=\pi (0.7)^2=1.539\ m^2$

For the area of square,

The circumference of wire, $C=2\pi r=2\pi \times 0.7=4.39\ m$

Side of square, $l=\dfrac{4.39}{4}=1.09\ m$

Area of square, $A_2=1.09^2=1.188\ m^2$

An emf is induced in the loop due to change in its area. The induced emf is given by :

$\epsilon=-B\dfrac{dA}{dt}$

$\epsilon=-B\dfrac{A_2-A_1}{t}$

$\epsilon=-0.44\times \dfrac{1.188-1.539}{0.14}$

$\epsilon=1.10\ V$

So, the magnitude of the average induced emf is 1.10 volts. Hence, this is the required solution.

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3 years ago

The hydrogen atom, changing from its first excited state to its lowest energy state, emits light with a wavelength of 122 nm. Th

tatyana61 [14]

Answer:

true b and c

Explanation:

n the electromechanical transitions of the atoms the relationship must be fulfilled

$\frac{x}{\lambda }$ = R (1 / nf - 1 / no²)

where for the final state nf = 1 giving in the case of hydrogen the Lymma series whose smallest wavelength is lam = 122 nm with nf = 1 and there are a series of spectral lines for each value of n of the final state

in the case of sodium so well it has a transition from an excited state to the kiss state (bad)

Now let's review the different proposals

a) False. The electronic potential for sodium is much lower than for hydrognosia

b) True

c) True

d) true

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3 years ago

Medical cyclotrons need efficient sources of protons to inject into their center. In one kind of ion source, hydrogen atoms (i.e

antoniya [11.8K]

Answer:

$r=5.278\times 10^{-4}\ m$

Explanation:

Given that:

magnetic field intensity, $B=0.07\ T$

kinetic energy of electron, $KE=1.2\ eV= 1.2\times 1.6\times 10^{-19}\ J= 1.92\times 10^{-19}\ J$

we have mass of electron, $m=9.1\times 10^{-31}\ kg$

<em>Now, form the mathematical expression of Kinetic Energy:</em>

$KE= \frac{1}{2} m.v^2$

$1.92\times 10^{-19}=0.5\times 9.1\times 10^{-31}\times v^2$

$v^2=4.2198\times 10^{11}$

$v=6.496\times 10^6\ m.s^{-1}$

<u>from the relation of magnetic and centripetal forces we have the radius as:</u>

$r=\frac{m.v}{q.B}$

$r=\frac{9.1\times 10^{-31}\times 6.496\times 10^6 }{1.6\times 10^{-19}\times 0.07}$

$r=5.278\times 10^{-4}\ m$

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3 years ago

Two objects are 5 kg and 10 kg respectively, and they're 10 m apart. if the distance between them is increased to 20 m, what hap

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I think it's OPTION A, IT DECREASES.

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3 years ago