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3 years ago

Please help!!

Physics

1 answer:

nikdorinn [45]3 years ago

4 0

Answer:

The waves travel at the same speed, but the observed frequency depends on any relative motion between the observer and source. When the observed frequency changes, so does the wavelength. If the observer and source are moving toward each other, then the frequency increases and the wavelength decreases

Explanation:

Hope it helps.

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1 Ten (10) ml aqueous solutions of drug A (10% w/v) and drug B (25% w/v) are stored in two identical test tubes under identical

Reil [10]

Answer:

YOUR answer is given below:

Explanation:

3 0

3 years ago

I have a question to whoever can tell me (10 points)

Step2247 [10]

you may just select the word answer and then without cutting it u may start to type ur answer then it will be in bold letter

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3 years ago

6. Drawing reliable conclusions from scientific evidence is important. Which of the following is a question that you can ask you

Over [174]

Answer:

What evidence supports their claim.

Explanation:

In the end, all that really matters in an experiment, is what scientific evidence supports the claim being made.

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3 years ago

The box shown on the rough ramp above is sliding up the ramp.calculate the force of friction on the box

Anna [14]

We are given a box that slides up a ramp. To determine the force of friction we will use the following relationship:

$F_f=\mu N$

Where.

$\begin{gathered} N=\text{ normal force} \\ \mu=\text{ coefficient of friction} \end{gathered}$

To determine the Normal force we will add the forces in the direction perpendicular to the ramp, we will call this direction the y-direction as shown in the following diagram:

In the diagram we have:

$\begin{gathered} m=\text{ mass}_{} \\ g=\text{ acceleration of gravity} \\ mg=\text{ weight} \\ mg_y=y-\text{component of the weight. } \end{gathered}$

Adding the forces in the y-direction we get:

$\Sigma F_y=N-mg_y$

Since there is no movement in the y-direction the sum of forces must be equal to zero:

$N-mg_y=0$

Now we solve for the normal force:

$N=mg_y$

To determine the y-component of the weight we will use the trigonometric function cosine:

$\cos 40=\frac{mg_y}{mg}$

Now we multiply both sides by "mg":

$mg\cos 40=mg_y$

Now we substitute this value in the expression for the normal force:

$N=mg\cos 40$

Now we substitute this in the expression for the friction force:

$F_f=\mu mg\cos 40$

Now we substitute the given values:

$F_f=(0.2)(10\operatorname{kg})(9.8\frac{m}{s^2})\cos 40$

Solving the operations:

$F_f=15.01N$

Therefore, the force of friction is 15.01 Newtons.

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1 year ago

A graduated cylinder contains 20.0ml of water. After a rock is placed in the cylinder, the level rises as shown below. what is t

Anestetic [448]

The volume of the rock, given the data is 14 mL (Option A)

<h3>Data obtained from the question</h3>

From the question given above, the following data were obtained:

Volume of water = 20 mL
Volume of water + rock = 34 mL
Volume of rock =?

<h3>How to determine the volume of the rock</h3>

The volume of the rock can be obtained by calculating the displacement of the water when the rock was added. this can be obtained as follow:

Displacement of water = (Volume of water + rock) - (volume of water)

Displacement of water = 34 - 20

Displacement of water = 14 mL

Thus, the volume of the rock is 14 mL

Learn more about volume of irregular object:

brainly.com/question/27911332

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Complete question:

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2 years ago