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2 years ago

An eagle is flying around and its velocity v as a function of time t is given in the graph below where

Physics

1 answer:

ahrayia [7]2 years ago

8 0

I honestly don’t even know

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If the resultant of two velocity vectors of equal magnitude is also of the same magnitude, then which statement must be correct?

Tamiku [17]

The correct option is C) The angle between the vectors is 120°.

Why?

We can solve the problem and find the correct option using the Law of Cosine.

Let A and B, the given two sides and R the resultant (sum),

Then,

$R=A=B$

So, using the law of cosines, we have:

$R^{2}=A^{2}+B^{2}+2ABCos(\alpha)\\ \\A^{2}=A^{2}+A^{2}+2*A*A*Cos(\alpha)\\\\0=A^{2}+2*A^{2}*Cos(\alpha)\\\\Cos(\alpha)=-\frac{A^{2}}{2*A^{2}}=-\frac{1}{2}\\\\\alpha =Cos(-\frac{1}{2})^{-1}=120\°$

Hence, we have that the angle between the vectors is 120°. The correct option is C) The angle between the vectors is 120°

Have a nice day!

4 0

2 years ago

What is the second most abundant element in the universe? <br> a. h <br> b. c <br> c. fe <br> d. he

Andru [333]

D I think I'm not sure!?.

7 0

3 years ago

Suppose you pluck a string on a guitar and it produces the note A at a frequency of 440 Hz. Now you press your finger down on th

MAVERICK [17]

Answer:

D. 550 Hz

Explanation:

Frequency for string is given by

$f_{} =\frac{v}{2L}$

where v is the speed of the wave, L = m is the length

Frequency is inversely proportional to the Length of the string

$f \alpha \frac{1}{L} \\$

from above relation we can write

$\frac{f_{1}}{f_{2}} =\frac{L_{2}}{L_{1}}$

The newly shortened string has 4/5 the length of the full string .i,e

$\frac{440}{f_{2}} =\frac{\frac{4}{5}L_{1} }{L_{1}}\\f_{2}=\frac{440\times5}{4} \\f_{2}=550 Hz$

Hence option D is correct

8 0

3 years ago

The current in a river is 1.0 meters/second. Britney swims 300 meters against the current. If she normally swims with a speed of

Nikitich [7]

The answer is 300s I believe.

4 0

3 years ago

Read 2 more answers

Apakah yang berlaku kepada kekuatan medan magnet jika satu lagi sel kering 1.5 v ditambahkan

ad-work [718]

Answer:

The magnetic field is doubled.

Explanation:

What happens to the strength of the magnetic field if one more 1.5 v dry cell is added?

The magnetic field due to a current carrying conductor is directly proportional to the current flowing in the wire.

If we connect one more battery of 1.5 V so the voltage is doubled and according to the Ohm's law, as the resistance of wire is constant, so the current in the wire is also doubled.

When the current doubles, the magnetic field produced by the wire is also doubled.

8 0

2 years ago