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3 years ago

8. What current flows through a 1.15 kW electric fire at a potential difference of

Physics

1 answer:

Vilka [71]3 years ago

4 0

Answer:

I = 5[amp]

Explanation:

Electrical power is defined as the product of voltage by current.

$P=V*I$

where:

P = power = 1150 [W]

V = voltage = 230 [V]

I = current [amp]

Now replacing:

$1150=230*I\\I=1150/230\\I=5[amp]$

A 15 [amp] fuse must be used. Always the fuse must be larger than the operating current, to protect the equipment from very high currents. above 15 [amp]

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Assume your car reaches a speed of 21.7 m/s at a steady rate for 5.05 s after the light turns green. (a) What distance have you

boyakko [2]

Answer:

The distance and average speed are 54.79 m and 10.85 m.

Explanation:

Given that,

Speed = 21.7 m/s

Time = 5.05 s

(a). We need to calculate the distance

Firstly we will find the acceleration

Using equation of motion

$v = u+at$

$a = \dfrac{v-u}{t}$

Where, v = final velocity

u = initial velocity

t = time

Put the value in the equation

$a = \dfrac{21.7-0}{5.05}$

$a = 4.297 m/s^2$

Now, using equation of motion again

For distance,

$s = ut+\dfrac{1}{2}at^2$

$s = 0+\dfrac{1}{2}\times4.3\times(5.05)^2$

$s=54.79\ m$

The distance is 54.79 m.

(b). We need to calculate the average speed during this time

$v_{avg}=\dfrac{D}{T}$

Where, D = total distance

T = time

Put the value into the formula

$v_{avg}=\dfrac{54.79}{5.05}$

$v_{avg}=10.85\ m/s$

Hence, The distance and average speed are 54.79 m and 10.85 m.

3 0

3 years ago

Can someone help me??

Dmitry_Shevchenko [17]

Answer:

Bones

Explanation:

There is no explanation

4 0

3 years ago

The mass of the sun is 2*10^30 kg and its radius is

Marta_Voda [28]

Explanation:

Distance d=1.5×108 km=1.5×1011 m

Mass of the sun, m=2×1030 kg

Mass of the earth, M=6×1024 kg

Force of gravitation, F=G×d2m×M

F=6.7×10−11×(1.5×1011)22×1030×6×1024=3.57×1022 N

4 0

3 years ago

(I) A 0.145-kg baseball pitched at 31.0 m/s is hit on a horizontal line drive straight back at the pitcher at 46.0 m/s. If the c

tangare [24]

Answer:

The force between the ball and the bat = 2233 N

Explanation:

Force: This can be defined as the product of force and its acceleration.

The S.I unit of Force is Newton (N)

F = ma .............................. Equation 1

Where F = Force , m = mass of the ball, a = acceleration of the ball.

where

a = (v-u)/t..................... Equation 2

Where v = final velocity of the ball, u = initial velocity of the ball, t = time of contact between the ball an the bat.

Given: v = 46 m/s u = - 31 m/s (it hit an horizontal line drive back at the pitcher), t = 5×10⁻³ s

Substituting these values into equation 2,

a = [46-(31)]/(5×10⁻³ )

a = 77×10³/5

a = 15.4×10³ m/s².

Also given m = 0.145 kg

Substituting into equation 1,

F = 0.145(15.4×10³ )

F = 2233 N

Thus the force between the ball and the bat = 2233 N

8 0

3 years ago

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Pepsi [2]

The answer is the first option "true." According to social exchange theory, altruistic behaviors benefit the individual who performs them is a true statement. That is because the word Altruism means doing acts to benefit themselves.

Hope this helps.

4 0

3 years ago

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