Is there any possibility to make 100% efficient system

What happens to the current in a circuit if the resistance triples? If the voltage triples?

Sauron [17]

(Example 1 )
If the Voltage that furnishes the current is an ideal (no internal resistance) Voltage source. Then; 

V/R = i 
V/2R = i/2 If external resistance doubles, current reduced to 1/2 of original value 
V/3R = i/3 If external resistance triples, current reduced to 1/3 of original value 

(Example 2) 
But if the Voltage that furnishes the current is a practical [contains an internal resistance (Ri)] Voltage source. Then the current is a function of the Voltage source`s internal resistance, which does not double nor triple, plus the external resistance which is being doubled and tripled. 

V/(R + Ri) = i 
V/(2R + Ri) = greater than i/2 but less than I. 
V/(3R + Ri) = greater than i/3 but less than i/2

7 0

4 years ago

Energy can be changed from one form to another. Changes in the form of energy are called energy conversions. In an automobile en

Harman [31]

Answer: D (chemical -> heat -> mechanical)

In automobile engines the petrol/diesel fuel enter in to the engine cylinder, due to spark at the end of the compression, fuel burnt increase the temperature and pressure, develops heat (chemical energy -> heat energy). This heat energy acts on a piston develops the work on the crankshaft ( Heat energy -> Mechanical energy).

4 0

3 years ago

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In some circumstances, it is useful to look at the linear velocity of a point on the blade. The linear velocity of a point in un

mihalych1998 [28]

Answer:

$v=wr$

Explanation:

Tangent and Angular Velocities

In the uniform circular motion, an object describes the same angles in the same times. If $\theta$ is the angle formed by the trajectory of the object in a time t, then its angular velocity is

$\displaystyle w=\frac{\theta}{t}$

if $\theta$ is expressed in radians and t in seconds the units of w is rad/s. If the circular motion is uniform, the object forms an angle $2\theta$ in 2t, or $3\theta$ in 3t, etc. Thus the angular velocity is constant.

The magnitude of the tangent or linear velocity is computed as the ratio between the arc length and the time taken to travel that distance:

$\displaystyle v=\frac{\theta r}{t}$

Replacing the formula for w, we have

$\boxed{ v=wr}$

4 0

3 years ago

What is the difference between electric force and electricity

FromTheMoon [43]

Answer:

Electrostatic force is force between two charges separated by distance in space while gravitational force is the force between two masses separated by a distance. Electrostatic force is either repulsive or attractive while gravitational force is always attractive

Explanation:

8 0

3 years ago

In severe head-on automobile accidents, a deceleration of 60 g’s or more (1 g 5 32.2 ft/s2) often results in a fatality. What fo

Musya8 [376]

Answer:

The resulting force on the child is 3000 lbf

Explanation:

To find the force that acts on a child of 50 lb with a deceleration of 60 g's, we can use the formula:

Force = mass * acceleration

To find the force in lbf, we need to use the mass in lb and the acceleration in g (standard unit of gravity).

So we have that:

Force = 50 * 60

Force = 3000 lbf

So the resulting force on the child is 3000 lbf.

3 0

3 years ago