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4 years ago

Why are units of measurement useful?

2 answers:

5 0

Without the ability to measure, it would be difficult for scientists to conduct experiments or form theories. Not only is measurement important in science and the chemical industry, it is also essential in farming, engineering, construction, manufacturing, commerce, and numerous other occupations and activities.

kondor19780726 [428]4 years ago

4 0

They set a common stadard by which all involved can understand the context of what is being evaluated.

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Compare and contrast the gravitational and electric forces.

Olin [163]

Answer: Idk I think I forgot

Explanation:

4 0

4 years ago

Suppose the Moon had twice the diameter but the same mass and same orbital distance from Earth. In that case, the high tides on

Inessa [10]

If the moon had twice the diameter with same mass and orbital distance from earth, then the high tides on Earth would be practically the same.

Explanation:

As the tides occurring in the earth is mostly due to the gravitational force of the moon acting on the earth. The distance between the earth and the moon mainly influences high tides. So, tidel force can be termed as directly proportionate to the gravitational forces acting between moon and earth.

As the gravitational forces act on Earth due to the moon will be directly proportionate to the product of masses of Earth and Moon and inversely proportionate to the distance squared (separation between Earth and Moon), due to the universal law of gravitation.

Thus, it can be stated that the diameter of the moon has no role to play in the high tides. As it is stated that the mass and distance almost remained the same, and there is only a change in the diameter of the moon, the high tides will not be exhibiting much change. Thus, on earth the high tides would be practically the same on increasing the diameter of the Moon.

5 0

3 years ago

An electron with an initial speed of 5.00××1055 m/s enters a region in which there is an electric field directed along its direc

Hitman42 [59]

Answer:

7.90 N/C

Explanation:

Given:

$u$ = initial velocity of the electron = $5\times 10^5\ m/s$

$v$ = final velocity of the electron = 0 m/s

$x$ = distance traveled by the electron before coming to rest = 9 cm = 0.09 m

Assume:

$e$ = charge on an electron = $1.6\times 10^{-19}\ C$

$m$ = mass of an electron = $9.1\times 10^{-31}\ kg$

$E$ = electric field along the direction of motion

$F$ = electric force on the electron

$W$ = work done by the electric force

Since the electron is moving in the direction of the electric field, then the electric force on it will act in the direction opposite to its displacement whose magnitude is given by:

$F = eE$

Since the displacement of the electron opposite to the direction of electron, the work done by electric force will be given by:

$W = - Fx\\\Rightarrow W = -eEx$

Since the electron enters the region of the uniform electric field with an initial speed u and travels a distance x to come to rest. The change in kinetic energy of the electron can be given by:

$\Delta K = \dfrac{1}{2}m(v^2-u^2)\\\Delta K = \dfrac{1}{2}m((0)^2-u^2)\\\Delta K = -\dfrac{1}{2}mu^2\\$

Since only the electric force is doing work on the electron, then the change in kinetic energy will be equal to the work done by electric force. This is due to the work-energy theorem.

$\therefore \Delta K = W\\\Rightarrow -\dfrac{1}{2}mu^2=-eEx\\\Rightarrow \dfrac{1}{2}mu^2=eEx\\\Rightarrow E=\dfrac{mu^2}{2ex}\\\Rightarrow E=\dfrac{9.1\times 10^{-31}\times (5\times 10^{5})^2}{2\times 1.6\times 10^{-19}\times 0.09}\\\Rightarrow E=7.90\ N/C$

Hence, the magnitude of electric field is given 7.90 N/C which point in the direction of the displacement of the electron.

8 0

4 years ago

What best describes the goals of scientific investigation and technological development?

klemol [59]

Scientific investigation aims to advance knowledge of the world around us so as to encourage technological development with the intended purpose of finding cures for disease, protecting natural resources, and enhancing human's productivity in all areas.

7 0

3 years ago

Read 2 more answers

Which is an example of

Kipish [7]

Answer:

A. an apple falling from a tree

Explanation:

8 0

3 years ago