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3 years ago

Neglecting losses in a transformer, it's input and output ______ are equal.

Physics

2 answers:

Mila [183]3 years ago

7 0

Neglecting losses in a transformer, it's input and output <em>power </em>are equal.<em> (C)</em>

Alex17521 [72]3 years ago

6 0

The input power in the transformer are equal to the output power of a transformer.

Answer : Option C

Explanation:

The transformers have power on either side as input or output to be constant. This is so because the transformers are the electrical device which transfer the energy between the circuits. There are two types of transformers, step up transformers and step down transformers.

Both follows the following expression of power = voltage x current. According to the type of transformer, the turns of wire and voltage and current are kept varying but the power remains constant.

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Mass and energy are alternate aspects of a single entity called mass-energy. The relationship between these two physical quantit

Sever21 [200]

Answer:

Explanation:

ΔE = Δm × c^2

where,

ΔE = change in energy released with respect to change in mass

= 1.554 × 10^3 kJ

= 1.554 × 10^6 J

Δm = change in mass

c = the speed of light.

= 3 × 10^8 m/s

Equation of the reaction:

2H2 + O2 --> 2H2O

Mass change in this process, Δm = 1.554 × 10^6/(3 × 10^8)^2

= 1.727 × 10^-11 kg

The change in mass calculated from Einstein equation is small that its effect on formation of product will be negligible. Hence, law of conservation of mass holds correct for chemical reactions.

8 0

3 years ago

A force of 8,480 N is applied to a cart to accelerate it at a rate of 26.5 m/s2. What is the mass of the cart?

katrin2010 [14]

Answer:

Just use F =ma where m is mass and a is acc.

8 0

3 years ago

For years, space travel was believed to be impossible because there was nothing there Rockets could push off in space in order t

soldier1979 [14.2K]

Because rockets do accelerate in space and have been able to do so for a long time.

Answer: Option D

<u>Explanation:</u>

A rocket is made to reach the sky and its required destination by the burning of fuels in the rocket. So there is no need of any other external forces to propel them in space. As per Newton's third law, the action and reaction forces will help the rockets to escape the orbit of earth.

And then the remaining energy required by the rocket to travel in space will be obtained from the burning of fuels in the compartments. This burning of fuels in respective compartments will propel the rockets in space. So it is a complete myth that space travel was impossible before because of inability to provide propulsion in space.

7 0

3 years ago

You place a penny on a turntable at a distance of 14.3 cm from the center. The coefficient of static friction between the penny

S_A_V [24]

Answer:

Time will be 2.13 sec

Explanation:

We have given that distance r = 14.3 cm = $=\frac{14.3}{100}=0.143m$

Coefficient of static friction $\mu =0.4$

Angular acceleration is given by $\alpha =2.45rad/sec^2$

We know that frictional force is given by $F=\mu mg$

And centrifugal force is given by $F=\frac{mv^2}{r}$

When coin just starts moving

$\mu mg=\frac{mv^2}{r}$

We know that $v=\omega r$ , here $\omega$ is angular velocity

According to first equation of motion we know that

$\omega =\omega _{i}+\alpha t$

As $\omega _i=0$

so $\omega =\alpha t$

$\mu g=\frac{\left ( r\alpha t \right )^2}{r}$

$\frac{\mu g}{r}=a^2t^2$

$t=\frac{\sqrt{\frac{\mu g}{r}}}{α}$

$t=\frac{\sqrt{\frac{0.4\times 9.8}{0.143}}}{2.45}=2.13sec$

8 0

3 years ago

You push on a 35N object for 3 seconds. find work?

Juli2301 [7.4K]

Answer:

This question is improper, The Formula for work is force times distance, it only provides you with force and time so you cannot calculate work without the distance, Maybe you've mistaken work for power, The formula is work divided by time, but ask your teacher to provide you with more information because this entire question is WRONG. If it didnt give you a distance there is a possibility that it's 0 which would be 35N*0m, get some clarification.

Explanation:

INCORRECT question

W=F*D

P=W/T

3 0

3 years ago