What is the power of a kitchen blender if it can perform 2000 joules of work in 5 seconds ?

What happens to particles of a substance as its temperature increases? A the average kinetic energy increases B the average kine

Gemiola [76]

The answer is A. When the the temperature increases the kinetic energy increases

6 0

3 years ago

How does a scientific theory compare to a scientific law?

shusha [124]

Answer:

In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.

Explanation:

Hope this helped

6 0

3 years ago

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An irregularly shaped rock is placed in 50 mL of water. The new reading in the container is now 74.2 mL. If the mass of the rock

cricket20 [7]

Taking into account the definition of density, the density of the rock is 3.6583 g/mL.

<h3>Definition of density</h3>

Density is defined as the property that matter has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

<h3>Density of the rock</h3>

In this case, you know that:

Mass= 88.53 g
Volume of the rock= Volume after place the rock in the water - Volume of water= 74.2 mL - 50 mL= 24.2 mL

Replacing in the definition of density:

density of rock= 88.53 g÷ 24.2 mL

Solving:

<u><em>density of rock= 3.6583 g/mL</em></u>

In summary, the density of the rock is 3.6583 g/mL.

Learn more about density:

brainly.com/question/952755

brainly.com/question/1462554

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8 0

2 years ago

2. A small piece of dust is located in between two oppositely charged parallel plates where there exists a uniform electric fiel

Alla [95]

Answer:

a

The total charge is $q = 1.6*10^{-4}C$

b

The change in potential energy is $\Delta U = -4*10^{-2}J$

c

The height is $h= 8.2cm$

Explanation:

From the question we are told that the

The magnitude of electric field is $E = 5000N/C$

The number of proton is $N_p = 1*10^{15}$

The distance between the plates is $d = 5cm = \frac{5}{100} = 0.05m$

The total charge can be mathematically represented as

$q = N_p * e$

Where e is the charge on one proton which has a value of $=1.6*10^{-19}C$

Substituting values

$q = 1 *10^{15} * 1.6*10^{-19} = 1.6 *10^{-4}C$

The change in potential energy is mathematically represented ads

$\Delta U = -(qE)d$

where the negative sign shows that the work done by the electric force is against the electric field

Substituting values

$\Delta U = - 1.6*10^{-4} * 5000 * 0.05$

$= -4*10^{-2}J$

The mass of the bead is given as 0.05kg

The change in potential due to gravity is mathematically given as

$\Delta U = -mgh$

the negative sign is due to the fact that the height is decreasing

And $g =9.8m/s^2$

Making h the subject

$h = \frac{\Delta U}{mg}$

Substituting values

$h = \frac{4*10^{-2}}{0.05 * 9.8}$

$=0.081m = 0.082 *100 = 8.2cm$

4 0

4 years ago

The physics of wind instruments is based on the concept of standing waves. When the player blows into the mouthpiece, the column

JulsSmile [24]

Answer:

1) f = 214 Hz , 2) answer is c , 3) f = 428 Hz , 4) f₂ = 428 Hz , f₃ = 643Hz

Explanation:

1) A tube with both ends open, the standing wave has a maximum amplitude and a node in its center, therefore

L = λ / 2

λ = 2L

λ = 2 0.8

λ = 1.6 m

wavelength and frequency are related to the speed of sound (v = 343 m / s)

v =λ f

f = v / λ

f = 343 / 1.6

f = 214 Hz

2) In this case the air comes out through the open hole, so we can assume that the length of the tube is reduced

λ' = 2 L ’

as L ’<L₀

λ' <λ₀

f = v / λ'

f' > fo

the correct answer is c

3) in this case the length is L = 0.40 m

λ = 2 0.4 = 0.8 m

f = 343 / 0.8

f = 428 Hz

4) the different harmonics are described by the expression

λ = 2L / n n = 1, 2, 3

λ₂ = L

f₂ = 343 / 0.8

f₂ = 428 Hz

λ₃ = 2 0.8 / 3

λ₃ = 0.533 m

f₃ = 343 / 0.533

f₃ = 643 Hz

4,1) as we have two maximums at the ends, all integer multiples are present

the answer is C

E) the length of an open pipe created that has a wavelength of lam = 1.6 m is requested

in this pipe there is a maximum in the open part and a node in the closed part, so the expression

L = λ / 4

L = 1.6 / 4

L = 0.4 m

the answer is C

F) in this type of pipe the general expression is

λ = 4L / n n = 1, 3, 5 (2n + 1)

therefore only odd values can produce standing waves

λ₃ = 4L / 3

λ₃ = 4 0.4 / 3

λ₃ = 0.533

f₃ = 343 / 0.533

f₃ = 643 Hz

5 0

3 years ago