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Lina20 [59]
3 years ago
5

calculate the currrent passing acrooss a bulb if it has a resistane of 15 ohms and a potentinal difference of 6v is applied acro

ss it
Physics
1 answer:
lawyer [7]3 years ago
4 0

V = IR

6 V = I × 15 Ohms

I = 6 V : 15 Ohms

I = 0,4 A

#LearnWithEXO

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A particular solid is electrically charged after it is rubbed, but it is not known whether its charge is positive or negative. H
pshichka [43]

Answer:

You can determine which charge has the solid by rubbing plastic and fur, and bringing near the plastic and the solid to determine if they are repeled or attracted. If they are repeled, the solid is charged negatively and if they are attracted, the solid is charged positively.

Explanation:

In order to determine the charge of the solid (negative or positive) using a piece of plastic and fur, you have to rubb the plastic with the fur (this is charging by friction)

Negative charges are transferred from the fur to the piece of plastic, therefore the plastic is charged negatively.

Then, you have to bring near the solid and the plastic. If them are repeled, it means that the solid is charged negatively (Because similar charges are repeled)

If them are attracted, it means that the solid is charged positively (Because opposite charges are attracted)

3 0
3 years ago
The deck of a bridge is suspended 235 feet above a river. If a pebble falls off the side of the bridge, the height, in feet, of
Aleks04 [339]

Answer:

(a) 1, average velocity = -65.6 m/s

   2, average velocity = -64.8 m/s

   3, average velocity = -64.16 m/s

(b) The instantaneous velocity is -96 m/s

Explanation:

(a)

Average velocity is given  by;

y(t_2,t_1) = \frac{y(t_2) - y(t_1)}{t_2-t_1}

(1)

y(2.1,2) = \frac{(235-16*2.1^2) - (235-16*2^2)}{2.1-2}\\\\ y(2.1,2) = -65.6 \ m/s

(2)

y(2.05,2) = \frac{(235-16*2.05^2) - (235-16*2^2)}{2.05-2}\\\\ y(2.05,2) = -64.8 \ m/s

(3)

y(2.01,2) = \frac{(235-16*2.01^2) - (235-16*2^2)}{2.01-2}\\\\ y(2.01,2) = -64.16 \ m/s

b. y = 235 - 16t²

The instantaneous velocity is given by;

v = dy /dt

dy / dt = -32t

when t = 3 s

v = -32(3)

v = -96 m/s

5 0
4 years ago
4. A tuning fork is held over a resonance tube, and resonance occurs when the surface of the water is 12 cm below the top of the
Mrac [35]

As we know that speed of sounds is given as

v = 332 + 0.6t

here we know that

t = 23 degree C

now from above equation we will have

v = 332 + (0.6)(23)

v = 345.8 m/s

now we also know that distance between two consecutive resonance length is half of the wavelength

L_2 - L_1 = \frac{\lambda}{2}

34 - 12 = \frac{\lambda}{2}

\lambda = 44 cm

now we know that

frequency = \frac{speed}{wavelength}

f = \frac{345.8}{0.44} = 786 Hz

so frequency will be 786 Hz

7 0
3 years ago
What would be the projectile's initial speed?
zalisa [80]

Math is the process of using the given information, along with
all the general stuff that you know, to find the missing information. 
With no given information, we have no way to even guess at
an answer.

8 0
4 years ago
A negatively charged rubber rod can pick up small, neutrally charged pieces of paper by a process called
Ronch [10]
The answer would be intoduction hope this really helped
4 0
4 years ago
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