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3 years ago

When describing the scientific evidence, what is the meaning of the word repeatable?

1 answer:

muminat3 years ago

7 0

Hello there,
The word 'repeatable' means, the scientific experiment is repeated in the same way, with the same methods and analysis.

Hope this helps :))

~Top

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What has to happen to an uncharged aluminum atom so that it will bond with oxygen?

iren [92.7K]

It has to lose electrons to become positively charged, so it can attract a negatively charged oxygen ion.

7 0

3 years ago

The air in a balloon is a type of _____.<br> a. matter<br> b. energy<br> c. volume

devlian [24]

the answer is A.

because it says THE AIR which means there is air in the balloon

8 0

2 years ago

You are conducting an experiment inside a train car that may move along level rail tracks. A load is hung from the ceiling on a

Triss [41]

Here the weight is hung from the thread inside the ceiling of train

now the FBD of train is analysed

We can say

$Tcos\theta = mg$

$Tsin\theta = ma$

now by ratio of two equations we have

$a = gtan\theta$

this shows that train must be in accelerating condition due to which the thread is making an angle with the vertical

now we will have

2 The train is not an inertial frame of reference.

Since train is accelerating so it must be non inertial frame

5 The train may be moving at a constant speed in a circle.

Since its moving in circle so it is in accelerating condition

8 The train must be accelerating.

3 0

2 years ago

If Earth had twice the mass it has now, how would the gravitational force between it and the Sun change?

zhenek [66]

Answer:

a)The gravitational force would be twice as much as it is now

Explanation:

If the earth had twice its mass as it is now, the gravitational force between the sun and the earth would be twice as much as it is now.

According to Newton's law of universal gravitation "the gravitational force of attraction between bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them".

F $_{g}$ = $\frac{G m _{e} m _{s} }{r^{2} }$

G is the universal gravitation constant

m is the mass

r is the distance

let mass of sun = s

mass of earth = e

new mass of sun = s

new mass of sun = 2e

input variables;

F = $\frac{Gx e x s}{r^{2} }$ ------ i

F = $\frac{G x s x 2e}{r^{2} }$ ------- ii

From the second equation;

2F = $\frac{Gx e x s}{r^{2} }$

2F = F

Therefore, the force will double.

7 0

3 years ago

A weight lifter bench‑presses a 160.0 kg 160.0 kg barbell from his chest to a height equal the length of his arms, 0.800 m . 0.8

Vaselesa [24]

Answer:

A. 1254.4 J

B. 1254.4 J

C. 43904 calories

Explanation:

Parameters given:

Mass of barbell, m = 160 kg

Length of arm, d = 0.8

A. Work done by weight lifter in lifting the barbell is:

W = F * d

Where F is force

F = m * g

=> W = m * g * d

W = 160 * 9.8 *0.8

W = 1254.4 J

B. Potential energy is given as:

PE = m * g * h

Where h is height (in this case, D)

=> PE = m * g * d

PE = 160 * 9.8 * 0.8

PE = 1254.4 J

C. The number of calories the weight lifter uses after lifting the barbell 35 times is equal to 35 times the potential energy, since a calorie is the measure of the amount of potential energy a piece of food contains:

35 * 1254.4 = 43904 calories.

5 0

3 years ago