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muminat
3 years ago
11

The current in a hair dryer measures 15 amps. The resistance of the hair dryer is 14 ohms. What is the voltage?

Physics
1 answer:
ZanzabumX [31]3 years ago
6 0
We have that there is a formula connecting these three. V=I*R where V is voltage, I is the current and R is the resistance. Substituting, we get that V=210 Volta, which is the unit of measurement for voltage. You can think of the relationship in the following way : The energy of the field is equal to the flow of the field times the resistance that it meets.
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bulgar [2K]

Answer:

0.9 N

Explanation:

The force exerted on an object is related to its change in momentum by:

F=\frac{\Delta p}{\Delta t}

where

F is the force exerted

\Delta p is the change in momentum

\Delta t is the time interval

The change in momentum can be rewritten as

\Delta p = m(v-u)

where

m is the mass

u is the initial velocity

v is the final velocity

So the formula can be rewritten as

F=\frac{m(v-u)}{\Delta t}

In this problem we have:

\frac{m}{\Delta t}=0.030 kg/s is the mass rate

u=-15 m/s is the initial velocity

v=+15 m/s is the final velocity

Therefore, the force exerted by the hail on the roof is:

F=(0.030)(+15-(-15))=0.9 N

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3 years ago
Even though petrol and water are liquids,what is different you observed between them?​
stellarik [79]

Answer:

water are heavier than patrol . Because petrol have less density than water ...

7 0
3 years ago
Please help its urgent 10 points!!
Stella [2.4K]

Answer:

Reduced by 10

Explanation:

It was said that the time was ten times more. For it to remain the same, the force must be ten times less. Because (1/10) x 10 = 1.

8 0
3 years ago
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An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such
rewona [7]

Answer:

0.035 (3.5 %)

Explanation:

The thermodynamic efficiency is given by:

\eta = 1 - \frac{T_C}{T_H}

where

T_C is the cold temperature

T_H is the hot temperature

In this problem we have

T_C = 5 ^{\circ}C+ 273 = 278 KT_H = 15^{\circ}C+273 = 288 K

So the efficiency is

\eta = 1 - \frac{278 K}{288 K}=0.035

6 0
3 years ago
What is the intensity of sound produced by an elephant's call if it has a power of 0.45 W and you are standing 32.5 m away from
liq [111]

Answer:

I = 1.36 x 10⁻⁴ W/m²

Explanation:

The intensity of the sound produced by the Elephant can be calculated by using the following formula:

I = \frac{P}{A} \\\\

where,

I = Intensity of sound = ?

P = power of sound = 0.45 W

A = area = πr² = π(32.5 m)² = 3318.3 m²

Therefore,

I = \frac{0.45\ W}{3318.3\ m^2} \\\\

<u>I = 1.36 x 10⁻⁴ W/m²</u>

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