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lyudmila [28]
3 years ago
8

What is a controlled experiment? none of the variables are changed all variables are kept constant two variables are changed at

a time one variable is changed at a time
Physics
1 answer:
Ostrovityanka [42]3 years ago
7 0

One variable is changed at a time

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On a spring scale that measures force, a reading shows the force of an object to be about halfway between 7 N and 8 N. Which of
Over [174]

Your answer is 7.5 N

3 0
3 years ago
What is non-point source pollution and why is this kind of pollution hard to monitor and control?
avanturin [10]

Answer:

When the source of pollution is widely distributive in nature, it is called as the Non-point source pollution, for example, <em>acid rain</em>.

Explanation:

the source of pollution when is <em>not concentrated over a particular area</em> or any particular defined pinpoint is termed to be as the Non - point source pollution.

this type of pollution is very hard to be monitored or controlled due to its nature of widely distributive nature of the origin. It has <em>several pathways</em> for the effect to undertake and thus the control over the effect is <em>not easily accessible. </em>

For example, during rain, the tree fall off can enter water stream from any source, either be it open lake or ponds or even street fall offs.

7 0
3 years ago
We are given a piece of copper of mass m=0.82 g to form a cylindrical wire of resistance R=0.87.2. What should be the length / o
Genrish500 [490]

Answer:

Length of wire=2.16 m

Diameter of wire=0.232 mm

Explanation:

m= mass of copper wire= 0.82 g

R= Resistance of copper wire= 0.87 ohms

D= Density of copper= 8.96 g/cm^3

ρ= Resistivity= 1.7×10^-8 Ωm

Density=\frac{mass}{volume}\\\Rightarrow volume=\frac{mass}{density}\\\Rightarrow volume=\frac {0.82}{8.96}\\\Rightarrow volume=0.091\ cm^3\\ volume = \pi r^2 l\\\Rightarrow \pi r^2=\frac{volume}{l}\\ \Rightarrow \pi r^2=\frac {0.091}{l}\\

\rho=R\frac{A}{l}\\\Rightarrow 1.7\times 10^{-8}=0.87 \frac{\pi r^2}{l}\\\Rightarrow 1.7\times 10^{-8}=0.87 \frac{0.091\times 10^{-6}}{l^2}\\\Rightarrow l^2=\frac {0.87\times 0.091\times 10^{-6}}{1.7\times 10^{-8}}\\\Rightarrow l^2=0.046\times 10^2\\\Rightarrow length=2.16\ m

\pi r^2=\frac {0.091}{l}\\\Rightarrow r^2=\frac {0.091\times 10^{-6}}{2.16 \pi}\\\Rightarrow r^2=1.34\times 10^{-8}\\\Rightarrow r=0.00011\ m\\\Rightarrow d=0.000232\ m\\\therefore diameter=0.232\ mm

3 0
3 years ago
Explain how mass and distance affect gravity (and other non-contact forces for that matter)
Anestetic [448]

Answer:

How Do Mass and Distance Affect the Force of Gravity Between Two Objects?  

The force of gravity between two objects is determined by the mass of each object and the distance between their centers. Objects with a greater amount of mass will exert a greater degree of gravitational pull, but as the distance between two objects increases, the gravitational force between them lessens.

Explanation:

An example of the significance of distance in Newton's law is how a person's weight decreases when they are further away from the center of the Earth, such as in an orbiting space station. The gravitational force, experienced as weight, is decreased, even through the person's mass and that of the Earth remain the same.

4 0
2 years ago
3
Evgen [1.6K]

Answer:

mass

.

Explanation:

5 0
3 years ago
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