A light bulb is plugged into a wall outlet (220 V) and it uses 0.68 amps. What is the light bulb’s resistance?

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses

Yuki888 [10]

Solution

Force between pair of objects of masses 1kg and 2kg that are 1m apart is given as

$F=G\times \frac{1\times 2}{1^2}$

here G is gravitational constant

G= $6.674\times10^{-11}Nm^2kg^{-2}$

therefore,

$F=6.674\times10^{-11}Nm^2kg^{-2}\times 2$

$F=13.348\times10^{-11}Nm^2kg^{-2}$

similarly Force between pair of objects of masses 2kg each that are 1m apart is given as

$F'=G\times \frac{2\times 2}{1^2}$

$F'=6.674\times10^{-11}Nm^2kg^{-2}\times 4$

$F'=2\times 13.348\times10^{-11}Nm^2kg^{-2}$

or F'=2F

it means Force between pair of objects of masses 2kg each that are 1m apart is equal to twice the Force between pair of objects of masses 1kg and 2kg that are 1m

7 0

3 years ago

What kind of friction exists between solid objects moving in water?

Stels [109]

The best and most correct answer among the choices provided by the question is drag<span>.

</span><span>Drag </span>kind of friction exists between solid objects moving in water.

Hope my answer would be a great help for you.
If you have more questions feel free to ask here at Brainly.

6 0

3 years ago

What is meant by pressure?write its unit.

Mars2501 [29]

Answer:

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed

Unit: Pascal (Pa)

1Pa = 1N/m^2

5 0

3 years ago

A series AC circuit contains a resistor, an inductor of 220 mH, a capacitor of 5.50 μF, and a generator with ΔVmax = 240 V opera

ki77a [65]

Answer:

$Xl=wL=69.11503383 ohm$

$Xc=\frac{-1}{wC}= -578.7452476 ohm$

$Z=\frac{240}{140*10^-3}=1.714285714 kilo-ohm$

$R=2.223915928 kilo-ohm$

$\alpha = -12.90698798 centigrades$

Explanation:

$L=220*10^-3$

$C=5.50*10^-6$

$Vmax=240V$

$Imax=140*10^-3$

$w=2\pi f=2\pi *50=314.1592654$

The capacitive reactance is given by:

$Xc=\frac{-1}{wC}=-578.7452476 ohm$

Now, The inductive reactance is given by:

$Xl=wL=69.11503383 ohm$

By the ohm´s law, the electrical impedance is:

$V=IZ$

So

$Z=\frac{V}{I}$

$Z=\frac{240}{140*10^-3}=1.714285714 kilo-ohm$

The total impedance is:

$Z=R+jX\\\\$ (*)

Where X is the total reactance given by:

$X=Xl+Xc=69.11503383-578.7452476=-509.6302138$

Let´s calculate the real part of Z using (*):

$R=1714.285714+509.6302138$

$R=2.223915928 kilo-ohm$

Finally the angle between the current and the voltage is equal to the impedance angle:

$\alpha=arctan(\frac{-509.6302138}{2223.915928})$

$\alpha =-12.90698798 centigrades$

8 0

3 years ago

The angle that the Sun’s rays strike a region of Earth determines the amount of heat transferred.

Lunna [17]

This statement is true. The angle that the Sun's rays strike a region of Earth determines the amount of heat transferred. For example, as you seen on TV, a laser pointing at an object and that specific angle that the rays of the laser pointed at was being melted. Same goes for the relationship between the Sun's rays and the Earth because it has the same energy that is being emitted per second.

3 0

4 years ago

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