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4 years ago

A wool cloth becomes positively charged as it

Physics

2 answers:

Lady_Fox [76]4 years ago

8 0

When wool cloth loses electrons, there'll be excess of protons left in wool. Hence option A is correct.

cestrela7 [59]4 years ago

5 0

Answer:

Option (A)

Explanation:

A body attains positive charge as some of the electrons removed from the body. As the electrons are negatively charged, if electrons removed, then the negative charge is removed and then the object remains some positive charge. because atom is electrically neutral.

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How is newtons third law of motion demonstrated on a roller coaster?

butalik [34]

<span>Newton's Third Law of Action-Reaction is that for each and every action that happens, there is an equal and opposite reaction to it. In the scenario of a roller coaster, this is when you push down on the seat of the roller coaster as it flies along and the seat pushes back against you.</span>

8 0

3 years ago

The gauge pressure inside an alveolus with a 200 µm radius is 25 mmHg, while the blood pressure outside is only 10 mmHg. Assumin

alekssr [168]

Answer:

The surface tension is 0.0318 N/m and is sufficiently less than the surface tension of the water.

Solution:

As per the question:

Radius of an alveolus, R = $200\mu m = 200\times 10^{- 6}\ m$

Gauge Pressure inside, $P_{in} = 25\ mmHg$

Blood Pressure outside, $P_{o} = 10\ mmHg$

Now,

Change in pressure, $\Delta P = 25 - 10 = 15\ mmHg = 1.99\times 10^{3}\ Pa$

Since the alveolus is considered to be a spherical shell

The surface tension can be calculated as:

$\Delta P = \frac{4\pi T}{R}$

$T = \frac{1.99\times 10^{3}\times 200\times 10^{- 6}}{4\pi} = 0.0318\ N/m = 0.318\ mN/m$

And we know that the surface tension of water is 72.8 mN/m

Thus the surface tension of the alveolus is much lesser as compared to the surface tension of water.

3 0

3 years ago

Carlos gives a grocery cart a 60-N push. The cart has a mass of 40 kg. What is the cart's acceleration?

andre [41]

<h3>Answer:</h3>

1.5 m/s²

<h3>Explanation:</h3>

We are given;

Force as 60 N

Mass of the Cart as 40 kg

We are required to calculate the acceleration of the cart.

From the newton's second law of motion, the rate of change in momentum is directly proportional to the resultant force.
That is, F = ma , where m is the mass and a is the acceleration

Rearranging the formula we can calculate acceleration, a

a = F ÷ m

= 60 N ÷ 40 kg

= 1.5 m/s²

Therefore, the acceleration of the cart is 1.5 m/s²

3 0

3 years ago

Two identical peaches, Peach 1 and Peach 2, fall from a cliff at time t=0t=0t, equals, 0 from the same height. Peach 1 is droppe

Hunter-Best [27]

Answer: The correct answer is graph A.

Explanation:

See Khan Academy.