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4 years ago

What is a substance?

Physics

1 answer:

ycow [4]4 years ago

3 0

A.a uniform mixture that can’t be separated

"substance" seems vague here

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Choose the appropriate descriptor for the term square centimeter .

CaHeK987 [17]

Area because CM^2 is the unit used for Area

8 0

4 years ago

What class lever is a

Alchen [17]

should be 1

Explanation:

because what do you use in class and has a lever

8 0

3 years ago

The distance between two consecutive nodesof a standing wave is 20.9cm.Thehandgen-erating the pulses moves up and down throughac

irina1246 [14]

Answer:

Velocity, v = 0.239 m/s

Explanation:

Given that,

The distance between two consecutive nodes of a standing wave is 20.9 cm = 0.209 m

The hand generating the pulses moves up and down through a complete cycle 2.57 times every 4.47 s.

For a standing wave, the distance between two consecutive nodes is equal to half of the wavelength.

$\dfrac{\lambda}{2}=0.209\ m\\\\\lambda=0.418\ m$

Frequency is number of cycles per unit time.

$f=\dfrac{2.57}{4.47}\\\\f=0.574\ Hz$

Now we can find the velocity of the wave.

Velocity = frequency × wavelength

v = 0.574 × 0.418

v = 0.239 m/s

So, the velocity of the wave is 0.239 m/s.

4 0

3 years ago

At a temperature of 250 K, the gas in a cylinder has a volume of 20 L. If the temperature increased to 260 K, what must the volu

masya89 [10]

Answer:b.20.8L

Explanation:

Since pressure is constant we can use the equation V1/T1 = V2/T2

(20/250)=(x/260)

5200=250x

X=20.8

3 0

4 years ago

What must the charge (sign and magnitude) of a 1.65 gg particle be for it to remain balanced against gravity when placed in a do

balandron [24]

Answer:

Charge, $q=2.52\times 10^{-5}\ C$ and it is negative.

Explanation:

Given that,

Mass of the charge, $m=1.65\ g=1.65\times 10^{-3}\ kg$

Electric field, E = 640 N/C

To find,

Charge

Solution,

The electric force and the force of gravity are balanced in the electric field. It is given by :

$qE=mg$

$q=\dfrac{mg}{E}$

$q=\dfrac{1.65\times 10^{-3}\times 9.8}{640}$

$q=2.52\times 10^{-5}\ C$

Since, the electric field is in downward direction. The force must be upward direction s that the charge is negative.

5 0

3 years ago

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