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3 years ago

Why is an object's density expressed as a combination of two units

1 answer:

6 0

Well, first of all, EVERY physical quantity is measured in a combination
of 2 or more units, except for mass, length, time, and electric charge.
ALL other units are made out of these. So it should not surprise you.

[ Example: Speed = (length) / (time) ]

Density is not the mass of a substance. It's the mass of a substance in
a standard volume of it. So the density is made of the mass in any lump
and the volume of that lump. That way, no matter how much of a substance
you have, you can always compare the lump you have to all other substances.

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Two guitars are playing together producing a beat frequency. The first guitar is playing at a frequency of 867 Hz and the beat i

vlabodo [156]

Answer:

The possible frequency of guitar are 842 HZ and 892 HZ.

Explanation:

given the beat frequency = $\frac{1}{0.04}$ = 25 HZ

we know that beat frequency = difference of frequencies of two instruments

therfore 25 = x-867 or 25 = 867-x

therefore x = 842 or 892

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4 years ago

What is the pathway of air into the body

ipn [44]

Answer:

Respiratory System

Explanation:

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3 years ago

Read 2 more answers

In the real world, the pendulum in a clock eventually comes to a stop. Someone or something needs to supply energy for the clock

Leno4ka [110]

Answer:

USING LAW OF CONSERVATION OF ENERGY

Explanation:

As we know that energy can not be created nor be destroyed.The pendulum cannot continue moving on its own because it meets energy losses due to friction.Its energy is converted into heat energy which dissipates in the air

8 0

2 years ago

Which term is defined as the change in the direction of light when it goes from one medium into a different medium?

love history [14]

Answer:

refraction

Explanation:

3 0

2 years ago

A ball is thrown upwards from the edge of a cliff. The horizontal velocity and vertical velocity are both 20m/s the distance fro

german

Answer:

20m

6.9s

Explanation:

The vertical velocity of the ball is 20m/s. We can calculate the kinetic energy which gets transferred to potential energy once it gets to the top.

$E_k = E_p$

$0.5mv^2 = mgh$

$h = \frac{0.5v^2}{g}$

we can subtitute v = 20m/s and g = 10m/s2

$h = \frac{0.5*20^2}{10} = 20 m$

So the ball could go 20m high from the child hand, or 120m fro the bottom of the cliff.

The time it takes for the ball to travels to the top is the time it takes for it to decelerate from 20m/s to 0m/s with gravitational deceleration g = 10m/s2

t = v / g = 20 / 10 = 2s

Then the ball will start accelerating down ward with a constant acceleration of g = 10m/s. In order to cover distance d of 120m from the top to the bottom of the cliff

$d = \frac{gt_2^2}{2}$

$t^2 = \frac{2d}{g} = \frac{2*120}{10} = 24$

$t = \sqrt{24} = 4.9s$

So the total time it takes is 4.9 + 2 = 6.9s

3 0

3 years ago