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3 years ago

______ states that energy cannot be created or destroyed.

Physics

2 answers:

Alex3 years ago

7 0

Answer:

c. The law of conservation of energy

Explanation:

The famous "law of conservation of Energy" states that energy inside an isolated system remains conserved. It can not be created and can't be destroyed as well. The energy can only be moved or transformed into another form.

This can be proved using "Noether's Theorem". Classically, only energy was considered conserved but Special Relativity proved that even mass is conserved as it showed the relation between mass and energy.

Pavel [41]3 years ago

4 0

The answer is a newton second law

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A basketball player of height 2.40 m is standing 2.60 m in front of a convex spherical mirror of radius of curvature 4.00 m. Det

IrinaVladis [17]

Answer:

The size of the image is 1.04 m.

Explanation:

Given that,

Height of object = 2.40 m

Distance of object = 2.60 m

Radius of curvature =4.00 m

Focal length $f=\dfrac{R}{2}=\dfrac{4.00}{2}=2.00$

We need to calculate the image distance

Using mirror formula

$\dfrac{1}{f}=\dfrac{1}{v}+\dfrac{1}{u}$

$\dfrac{1}{v}=\dfrac{1}{2.00}+\dfrac{1}{2.60}$

$\dfrac{1}{v}= \dfrac{23}{26}$

$v=1.13\ cm$

We need to calculate the height of the image

Using formula of magnification

$m=\dfrac{h'}{h}=-\dfrac{v}{u}$

Put the value into the formula

$\dfrac{h'}{2.40}=-\dfrac{1.13}{-2.60}$

$h'=\dfrac{1.13}{2.60}\times2.40$

$h'=1.04\ m$

Hence, The size of the image is 1.04 m

8 0

3 years ago

what factors limit the accuracy of a potentiometer and what was the objective of reversing the terminals of the cell

cricket20 [7]

Explanation:

"The accuracy of a potentiometer can be increased by decreasing the potential gradient across the potentiometer wire, and this can be achieved by increasing the length"

The factors that are affecting/limiting the accuracy of the potentiometer are:

The specific resistance of the material of the potentiometer wire.
The potential gradient
The current passing through the potentiometer wire.
Area of a cross-section of the wire
Internal temperature.

The objective of reversing the terminals of the cell

If the jockey of the potentiometer is pressed for a long time, joule heating sets in, so that reversing the terminals of the potentiometer will prevent the resistance due to joule heat from being added to the measured resistance, ultimately preventing unwanted resistance

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3 years ago

Find the distance covered by a car in 10 second, if it is moving at the speed of 20m/s

labwork [276]

Answer:

solution

we know that .

s=ut+½at²

now, putting the values in the second equation of motion ,

we get,

S=20×10+1/2×(10)²

S=200+1×100

S=200+100

S=300m

the distance covered by given body or object in 10 seconds is 300 m.

8 0

3 years ago

Can you cool a kitchen by leaving the refrigerator door open while the refrigerator is operating? a. No. Since the refrigerator

slava [35]

Answer:

Explanation:

because will the cool air will be leaving the fridge the motor in the bottom will be running and eventually the mixture of the cool and hot air will balance out

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3 years ago

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In circular orbit, the gravitational force on a satellite is A. constant in magnitude. B. at right angles to satellite motion. C

steposvetlana [31]

I would say C. if im wrong, im sorry. but if im right your welcome. i didnt guess tho.

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3 years ago

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