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3 years ago

What is meant by the term law of conservation?

Physics

2 answers:

GalinKa [24]3 years ago

4 0

Answer:

Explanation:

any law stating that some quantity or property remains constant during and after an interaction or process, as conservation of charge or conservation of linear momentum.

padilas [110]3 years ago

4 0

<h2><em><u>Answer:</u></em></h2><h2><em><u>The law of conservation of matter or principle of matter conservation states that the mass of an object or collection of objects never changes over time, no matter how the constituent parts rearrange themselves. The mass can neither be created nor destroyed.</u></em></h2><h2><em><u>Explanation:</u></em></h2>

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A standard 12 V car battery has an ampere-hour rating of 40 Ah, whereas a heavy-duty battery has a rating of 60 Ah. How would yo

stiv31 [10]

Answer:

Explanation:

Ah is a unit of charge .

A battery with 12 V and charge capacity of 40 Ah will have energy content

= volt x charge

volt = 12 V

Charge = 40 Ah

= 40 x 60 x 60 A.s

= 144000 coulomb

energy content = 12 x 144000

= 1728000 J

energy content of heavy duty battery

= 12 x 60 x 60 x 60

= 2592000 J

Ratio = 1728000 / 2592000

= 2 / 3

Current can not be compared as current depends upon the resistance of appliance used . As resistance of appliance is unknown , current can not be compared.

3 0

4 years ago

An enemy spaceship is moving toward your starfighter with a speed, as measured in your frame, of 0.400c. The enemy ship fires a

kvasek [131]

Answer:

0.859375c

31.03 seconds

Explanation:

v' = Velocity of my ship = 0.4 c

u = Velocity of rocket = 0.7 c

c = Speed of light = $3\times 10^8\ m/s$

s = Distance between my ship and enemy ship = $8\times 10^6\ km$

Relativistic addition of speed is given by

$v=\dfrac{v'+u}{1+\dfrac{uv'}{c^2}}\\\Rightarrow v=\dfrac{0.7+0.4}{1+\dfrac{0.7c\times 0.4c}{c^2}}\\\Rightarrow v=0.859375\ c$

The speed of the missile is 0.859375c

Time is given by

$t=\dfrac{s}{v}\\\Rightarrow t=\dfrac{8\times 10^9}{0.859375\times 3\times 10^8}\\\Rightarrow t=31.03\ s$

It will take 31.03 seconds to reach me.

6 0

3 years ago

an athlete runs 5.4 laps around a circular track that is 400.0 m long. If this takes 540 s, what is the average velocity of the

Slav-nsk [51]

Answer:

Average velocity is 0.296 m/s.

Average speed is 4.0 m/s.

Explanation:

Given:

Distance of the circular track is, $D=400.0\ m$

Number of laps ran is, $n=5.4$

Time taken for the run is, $t=540\ s$

Now, total distance covered in 5.4 laps = $D_T=D\times n=400\times 5.4=2160\ m$

Also, since the path is a circle, the final position of the athlete after 5.4 laps will be 0.4 of 400 m ahead of the starting point.

Distance covered in 0.4 laps is, $\textrm{Displacemet}=0.4\times 400=160\ m$

Therefore, the displacement of the athlete will be 160 m as the athlete is 160 m ahead of the starting point and displacement depends on the initial and final points only.

Now, average velocity is given as:

$v_{avg}=\frac{\textrm{Displacemet}}{t}=\frac{160}{540}=0.296\ m/s$