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3 years ago

What phenomenon allows the sidewalk to heat up and

Physics

2 answers:

IRINA_888 [86]3 years ago

7 0

Answer:

A. absorption

Explanation:

Oliga [24]3 years ago

5 0

The answer is absorption

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A machinist with normal vision has a near point at 25 cm. The machinist wears eyeglasses in order to do close work. The power of

Alik [6]

Answer:

17.4 cm

Explanation:

Power of lens = +1.75 diopters

Focal length of lens

$f=\frac{100}{1.75}=\frac{400}{7}$

This is a convex lens as focal the diopter given is positive which makes the focal length positive. Image distance will be negative.

v = -25

$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\\\Rightarrow \frac{1}{-25}-\frac{1}{u}=\frac{1}{\frac{400}{7}}\\\Rightarrow -\frac{1}{u}=\frac{7}{400}+\frac{1}{25}\\\Rightarrow \frac{1}{u}=-\frac{7}{400}-\frac{1}{25}\\\Rightarrow \frac{1}{u}=-0.0575\\\Rightarrow u=-17.4\ cm$

∴ The new near point is 17.4 cm

7 0

3 years ago

Find the missing spaces in the charts below! Please!

Neko [114]

Answer:

Zinc- Zn

Mass Numbers:

Tin-118.71 u

Zinc- 65.38

Protons:

Tin-50

Atomic number zinc 45.38

Zinc has 30 electrons

Tin has 50 electrons

35 neutrons in zinc

iodine-

atomic number- 53

78 neutrons

cl-1 is chlorine

atomic number 17

18 neutrons

17 electrons

atomic number 35 is bromine

symbol Br

35 protons

45 neutrons

35 electrons

Aluminium

protons and electrons 13

neutrons 14

atomic number 14

fe+2

26 protons

24 electrons

30 neutrons

ferrous iron

Cu+1 copper

63.546 mass number

proton and electron 29

neutron 35

5 0

3 years ago

How can i be a basketball player

kondaur [170]

Try practicing basketball in your free time and learn to love it. You can also apply to schools or teams that teaches basketball more. Get good teachers.

3 0

2 years ago

Read 2 more answers

If you enjoy teaching small or large glasses and being active every day which career would be a good fit for you

tino4ka555 [31]

Your preferences would fit well with the careers of bar-tending, optometry, or school teaching.

6 0

3 years ago

Three pendulums with strings of the same length and bobs of the same mass are pulled out to angles θ1, θ2, and θ3, respectively,

seropon [69]

Answer:

The angular frequencies of all the 3 pendulums shall be same.

Explanation:

The time period of a simple pendulum with the approximation $sin(\theta )\approx \theta$ is given by:

$T=2\pi\sqrt{\frac{l}{g}}$

The angular frequency $\omega$ is given by

$\omega =\frac{2\pi }{T}\\\\\omega =\frac{2\pi}{2\pi \sqrt{\frac{l}{g}}}\\\\\therefore \omega =\sqrt{\frac{g}{l}}$

As we can see that the angular frequency is independent on the initial angle (valid strictly for small angle approximations) we conclude that the angular frequencies of the 3 pendulums are the same.

6 0

4 years ago