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3 years ago

Given that "mass" multiply by constant “k” is equal to "energy" divided by

Physics

1 answer:

Annette [7]3 years ago

4 0

Answer:

K must be an acceleration

Explanation:

Recall that unit of energy consists the following dimensions:

mass * length^2 / time^2

then if we have : mass * K = energy / length

then the units of K can be obtained by replacing the units of energy by (mass * length^2 / time^2), and then dividing by units of mass:

K = (mass * length^2 / time^2)/ (length * mass)

where we cancel out units of mass, and one unit of length resulting in units of length divided units of time squared. and such are units of acceleration. Therefore K must be an acceleration.

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A wire delivers 120 C of charge in 40 s.

Neporo4naja [7]

Answer:

3 A

Explanation:

Charge is a product of current and time, expressed as Q=It where Q is charge in Coulombs, I is current in Amperes and t is time taken in seconds. Making I the subject of the formula then $I=\frac {Q}{t}$

Substituting 120 C for charge and 40 s for t then $I=\frac {120}{40}=3\ A$

From the choices given, it appears that time should have been 4 s to get option A or alternatively charge should have been 1200 C

3 0

3 years ago

Please please help. I don’t understand this.

Kazeer [188]

Which questions do you need help? I could help you

5 0

4 years ago

How do i do this question？just number 5

larisa86 [58]

5 a)

Start by arranging the materials by the sonic speed and then their physical state:

$4600 \; \text{m} \cdot \text{s}^{-1}$ - Copper (solid)
$4500 \; \text{m} \cdot \text{s}^{-1}$ - Glass (solid)
$4000 \; \text{m} \cdot \text{s}^{-1}$ - Wood (solid)

$1500 \; \text{m} \cdot \text{s}^{-1}$ - Sea Water (liquid)
$1200 \; \text{m} \cdot \text{s}^{-1}$ - Acetone (liquid)
$1100 \; \text{m} \cdot \text{s}^{-1}$ - Alcohol (liquid)

$972 \; \text{m} \cdot \text{s}^{-1}$ - Helium (gas)
$267 \; \text{m} \cdot \text{s}^{-1}$ - Carbon dioxide (gas)

What trend do you identify from these data? Here's what I've got:

$\text{Sonic Speed}: \text{solid} > \text{liquid} > \text{gas}$

5 b)

The way microscopic particles are arranged in a substance helps distinguish between different physical states:

Particles in a solid are held tightly in place with small separation in between; it's hard for particles in a solid to move past one another; solids therefore have shapes that persists over time.
Particles in a gas are highly mobile- they keep moving AT ALL TIMES. There are large separations between individual particles and therefore gases tend to show no definite shape or volume.
The arrangement of particles in a liquid is located somewhere in between that of solids and gases. The exact configuration is dependent on the nature of the liquid- for example, molecules in maple syrup are held way closer to each other than those in distilled water are.

Sound travels as a longitudinal wave. As a sound wave passes through a medium, individual particles become excited and gain energy; as they run into others they transfer their energy to the next particle; the sound wave thus propagate across the medium. With a lower average distance between individual particles this action can proceed at a greater rate in average solids than in average liquids, and in average liquids than in average gases. Hence the trend.

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4 years ago

Which of the following most completely describes an object’s motion?

Ronch [10]

Position, speed, direction, and acceleration

7 0

4 years ago

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AysviL [449]

Answer:

1)Eat healthy food

2)Exercise daily

3)Drink plenty of water

4)Get plenty of sleep

5)Do not take stress

6)Be hygienic

Explanation:

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3 years ago