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3 years ago

What technique is used by scientists to determine which of several explanations is the best explanation

Physics

1 answer:

jok3333 [9.3K]3 years ago

4 0

Answer:

When conducting research, scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis (often in the form of an if/then statement), the results aiming to support or contradict a theory.

I HOPE ITS RIGHT

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Is electron positive

castortr0y [4]

No the electron is a negative.

The proton is the positive.

Hope this helps!

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3 years ago

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Which would not be a reason for using wind power?

Nookie1986 [14]

C it takes a lot of capital to get the windmills and the fields of windmills set up

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3 years ago

A 10 kg gun recoils with a speed of 0.1 m/s after it fires a 0.001 kg bullet. What is the speed of the bullet?

Kitty [74]

As we know that here gun + bullet system is isolated from all other external force system

so here the momentum of system is always conserved

so we will say

$m_1v_{1i} + m_2v_{2i} = m_1v_{1f} + m_2v_{2f}$

here we know that

$v_{1i} = v_{2i} = 0$

$m_1 = 10 kg$

$m_2 = 0.001kg$

$v_{1f} = 0.1 m/s$

now we will have

$0 + 0 = 10(0.1) + 0.001v_{2f}$

by solving above equation we will have

$v_{2f} = 1000 m/s$

3 0

3 years ago

A sled of mass 80 kg starts from rest and slides down an 18° incline 90 m long. It then travels for 20 m horizontally before sta

yaroslaw [1]

Answer:

net work done by friction = - 2205 J

Explanation:

given,

mass of sled = 80 kg

slide down at an angle of 18°

length = 90 m

travel horizontally = 20 m before starting back up a 16° incline.

net work = ?

$h_i = initial\ height$

$h_i = L_i Sin 18^0$

$h_i = 90 sin 18^0$

$h_i = 27.81\ m$

$h_f = Final\ height$

$h_f = L_f Sin 16^0$

$h_f = 90 sin 16^0$

$h_f =24.81\ m$

net work done by friction = change in potential energy

= mg (h_f - h_i)

= (75) (9.8) (- 27.81 + 24.81)

net work done by friction = - 2205 J

7 0

3 years ago

Describe the process of star formation

inysia [295]

Answer:

Explanation:

1. Gravity condenses a dense cloud (nebulae) of gas (there is nothing to fight gravity at this point)

2. As density increases, pressure increases, pushing against gravity

3. As pressure rises, temp rises and if temp gets hot enough (if mass large enough) nuclear reactions wills start.

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3 years ago