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denis23 [38]
3 years ago
12

Which term describes the time it takes for half of a radioactive elements atoms to decay?

Physics
1 answer:
Irina18 [472]3 years ago
5 0

The answer is Half-life

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A scientist would build a model to observe what?
Serjik [45]
How the planets revolve around the earth.. since you can't approach some of them . which are far from the earth.. thus it is quite obvious that they should build a solar system and how planets integrate and move around the dynamic space time
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3 years ago
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What is the resistance in a circuit that has a current of 0.75A and a voltage drop of 60V across the cell?( Please help) I will
Marrrta [24]

difference across the 12.0 Ω resistor is 1.20 V, calculate the emf of the cell. 45. Req = 13.5 Ω ... (b) I = V / Reff = 1.5 / 2 = 0.75 A.

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3 years ago
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A department store sells an ""astronomical telescope"" with an objective lens of 30 cm focal length and an eyepiece lens of foca
Yuliya22 [10]

Answer:

The magnifying power of this telescope is (-60).

Explanation:

Given that,

The focal length of the objective lens of an astronomical telescope, f_o=30\ cm

The focal length of the eyepiece lens of an astronomical telescope, f_e=5\ mm=0.5\ cm

To find,

The magnifying power of this telescope.

Solution,

The ratio of focal length of the objective lens to the focal length of the eyepiece lens is called magnifying of the lens. It is given by :

m=\dfrac{-f_o}{f_e}

m=\dfrac{-30}{0.5}

m = -60

So, the magnifying power of this telescope is 60. Therefore, this is the required solution.

7 0
3 years ago
A rod of length 30.0cm has linear density (mass per length) given by
jeka94

The distance from the center of mass is as shown in the image:

<h3>What is the center of mass?</h3>
  • The center of mass, sometimes referred to as the balancing point in physics, is the only location where the weighted relative position of the distributed mass accumulates to zero.
  • Here is where a force can be applied to produce a linear acceleration without also producing an angular acceleration. When calculations in mechanics are made about the center of mass, they are frequently made simpler. It is a fictitious location where one can suppose that an object's full mass is concentrated to see its motion.
  • In other words, to apply Newton's equations of motion, the center of mass is the particle equivalent of the provided item.

To learn more about the Center of mass, refer to:

brainly.com/question/8662931

#SpJ4

5 0
1 year ago
Jalen combines two substances in science class. Once combined, only one of the two substances
dusya [7]

Answer: b. The combination is a mixture because the substances can be separated

Explanation: Based on the facts presented above, the combination of both both substances can be referred to as a mixture due to the following:

A mixture is obtained when two or more substances or materials are combined without a chemical reaction. This is observed when Jalen combined substance 1 and 2 with only one of the substances becoming visible after the combination.

The other reason is that, a mixture can be separated back into its original constituent, this is evident when the combination was filtered with only substance 2 going through the filter and substance 1 remaining in the filter

4 0
3 years ago
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