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3 years ago

10

A portable electric heater has a resistance of 10 ohms. It plugs into a wall outlet that is 120 V. How much current, in amps, do

es it draw?

1 answer:

skad [1K]3 years ago

5 0

Answer:

12 A

Explanation:

I = V/R = 120 V/ 10 Ohm = 12 A

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V=vi+at^2 dimensional correct

I am Lyosha [343]

Answer:

Yes, dimensionally the equation is correct.

Explanation:

This equation is the kinematic equation for uniformly accelerated motion, then we study the units of each member to conclude whether it is dimensionally correct.

vi = initial velocity [m/s]

a = acceleration [m/s^2]

t = time [s]

v = final velocity

therefore we have:

[m/s] + [m/s^2]*[t^2], the second term now is m/s

[m/s] + [m/s] = [m/s]

So the analysis is correct.

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3 years ago

Rasheed ran down the football field at a speed of 7m/s. If he got to the end in 23

stira [4]

Answer:

<h3>The answer is 161 m</h3>

Explanation:

To find the distance covered we use the formula

<h3>distance = velocity × time</h3>

From the question

velocity = 7 m/s

time = 23 s

We have

distance = 7 × 23

We have the final answer as

<h3>161 m</h3>

Hope this helps you

7 0

3 years ago

Heat is best defined as

Kisachek [45]

C. The flow of energy from one point to another.

5 0

2 years ago

A car drives on a circular road of radius R. The distance driven by the car is given by = + [where a and b are constants, and t

pishuonlain [190]

Answer:

The question is incomplete, the complete question is "A car drives on a circular road of radius R. The distance driven by the car is given by d(t)= at^3+bt [where a and b are constants, and t in seconds will give d in meters]. In terms of a, b, and R, and when t = 3 seconds, find an expression for the magnitudes of (i) the tangential acceleration aTAN, and (ii) the radial acceleration aRAD3"

answers:

a. $18a m/s^{2}$

b. $a_{rad}=\frac{(27a +b)^{2}}{R}$

Explanation:

First let state the mathematical expression for the tangential acceleration and the radial acceleration.

a. tangential acceleration is express as

$a_{tan}=\frac{d|v|}{dt} \\$

since the distance is expressed as

$d=at^{3}+bt$

the derivative is the velocity, hence

$V(t)=\frac{dd(t)}{dt}\\V(t)=3at^{2}+b\\$

hence when we take the drivative of the velocity we arrive at

$a_{tan}=\frac{dv(t)}{dt}\\ a_{tan}=6at\\t=3 \\we have \\a_{tan}=18a m/s^2$

b. the expression for the radial acceleration is expressed as

$a_{rad}=\frac{v^{2}}{r}\\a_{rad}=\frac{(3at^{2} +b)^{2}}{R}\\t=3\\a_{rad}=\frac{(27a +b)^{2}}{R}$

4 0

3 years ago

A musician hits a drum with a drumstick. In three to four sentences, explain the collision forces between the drum and drumstick

Gnoma [55]

Answer:

Explanation:

In a collision, there is a force on both objects that causes an acceleration of both objects; the forces are equal in magnitude and opposite in direction. When you hit a drum with a drumstick, there is a collision. The force both objects release causes the drumstick to bounce on the drum

4 0

3 years ago