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3 years ago

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To determine if an object is in motion, you must use a __________. Question 1 options: Moving object Living thing Frame of Refer

ence Larger object

1 answer:

Lubov Fominskaja [6]3 years ago

8 0

Answer: moving object :)

Explanation:

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Which of the following is NOT true for a spherical concave mirror? a. it cannot produce virtual images

dimulka [17.4K]

Answer:

Its focal length is positive

Explanation:

A concave mirror is shown in attached figure. The distance from the pole to the focus of the mirror is called its focal length. Spherical mirrors are a part of a sphere.

As per conventions, we know that the axis opposite to x axis is taken as negative.

So, it is clear that the focal length of spherical concave mirror is negative.

Hence, the incorrect option is (c) " its focal length is positive".

7 0

3 years ago

I need help with these questions :<br>(see image )

maw [93]

<h2>Hey There!</h2><h2>_____________________________________</h2><h2>Answer:</h2>

$\huge\boxed{Theta=25.67}$

<h2>_____________________________________</h2><h3>DATA:</h3>

Range = R = 78m

Initial Velocity = $V_i$ = 30m/s

Angle(theta) = ?

<h2>_____________________________________</h2><h3>SOLUTION:</h3>

The Range is given by,

$R =\frac{V_0^2}{g}Sin2(theta)\\\\78 = \frac{30^2}{10}Sin2(theta)\\\\Sin2(theta) = \frac{780}{900}\\\\Sin2(theta) = \frac{13}{15}\\\\Sin(theta) = \frac{13}{30}\\\\theta = Sin^{-1}\frac{13}{30}\\\\theta = 25.67^0$

<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2><h2 />

7 0

3 years ago

If a book has a a mass of 2 kg, how much does the book weigh?

Anestetic [448]

Answer:

A. 20 N

Explanation:

the weight of book is 2×10= 20N

7 0

3 years ago

What is used in a torch? <br> a. Dry cell<br> b. Secondary cell<br> c. Generator<br> d. Fuse

max2010maxim [7]

Answer:a.Dry cell

Explanation: A dry cell is a type of electric battery, commonly used for portable electrical devices like a flashlight

6 0

3 years ago

Read 2 more answers

A U-shaped tube open to the air at both ends contains some mercury. A quantity of water is carefully poured into the left arm of

Gekata [30.6K]

Answer:

a) $P=2450\ Pa$

b) $\delta h=23.162\ cm$

Explanation:

Given:

height of water in one arm of the u-tube, $h_w=25\ cm=0.25\ m$

a)

Gauge pressure at the water-mercury interface,:

$P=\rho_w.g.h_w$

we've the density of the water $=1000\ kg.m^{-3}$

$P=1000\times 9.8\times 0.25$

$P=2450\ Pa$

b)

Now the same pressure is balanced by the mercury column in the other arm of the tube:

$\rho_w.g.h_w=\rho_m.g.h_m$

$1000\times 9.8\times 0.25=13600\times 9.8\times h_m$

$h_m=0.01838\ m=1.838\ cm$

<u>Now the difference in the column is :</u>

$\delta h=h_w-h_m$

$\delta h=25-1.838$

$\delta h=23.162\ cm$

7 0

3 years ago