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ki77a [65]
3 years ago
13

An instrument for observing very small objects is

Physics
1 answer:
VladimirAG [237]3 years ago
6 0
Microscope
A microscope shines a light through a slide with the sample of the object on and you look through a lens that allows you to magnify it by a very significant amount depending on what kind of microscope you have (a powerful electron microscope can magnify to the atomic level).

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There is a current of 0.99 a through a light bulb when its connected to a 9.7 v battery what is the resistance of the light bulb
denis23 [38]

Ohm's law states that V=IR, where V=voltage, I=current(amps), and R=resistance (in Ohms).

Plugging the values into the above equation yields a resistance in the light bulb of 9.8 ohms

4 0
2 years ago
You toss a rock of mass mm vertically upward. Air resistance can be neglected. The rock reaches a maximum height hh above your h
skad [1K]

Answer:

The speed of the rock when it is at height h/4 is \dfrac{\sqrt{3gh} }{2}.

Explanation:

At maximum height the final velocity of the rock is equal to 0. Let u is the initial velocity of the rock. Using the conservation of energy to find it as :

u^2=2gh.......(1)

We need to find the speed of the rock when it is at height h/4. Let v' is the speed. Using 3rd equation of motion as :

v'^2=u^2+2as

here a = -g and s = h/4

v'^2=u^2-2g\times \dfrac{h}{4}

Using equation (1) :

v'^2=(2gh)-2g\times \dfrac{h}{4}\\\\v'^2=\dfrac{3gh}{4}\\\\v'=\dfrac{\sqrt{3gh} }{2}

So, the speed of the rock when it is at height h/4 is \dfrac{\sqrt{3gh} }{2}. Hence, this is the required solution.

3 0
3 years ago
Read 2 more answers
What are the advantages of using a blue flame instead of a yellow one for heating objects?
seropon [69]
A blue flame is a manifestation that the combustion process is complete where there are no formation of carbon monoxide. On the other hand, a yellow flame represents an in complete combustion. Generally, a blue flame is much hotter as compared to a yellow flame so it heat things up faster. Also, it is a much cleaner flame as it does not produce soot which leaves a black residue on the material being heated.
8 0
3 years ago
Suppose two vectors have unequal magnitudes. can their sum be zero? explain
GalinKa [24]

Answer;

-  No, Two vectors of unequal magnitude can never sum to zero.

Explanation;

-Two vectors of equal magnitude that are pointing in opposite directions will sum to zero.

-Two vectors of unequal magnitude can never sum to zero. If they point along the same line, since their magnitudes are different, the sum will not be zero.

- If they point in different directions, then you can always decompose one vector into two components: one along the other vector and one perpendicular to the other vector. In this case, the perpendicular component can never be eliminated.

5 0
3 years ago
Is it possible for an object to have a charge of 4.8x10-9 C? Why or why not?
Gelneren [198K]
I have absolutely no clue
3 0
3 years ago
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