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3 years ago

Why will an empty water bottle contract in a cold car overnight, only if the lid is on?

Physics

2 answers:

Vera_Pavlovna [14]3 years ago

6 0

It would fog up and when it fogs up the fog will produce liquid

Vinvika [58]3 years ago

5 0

As ur bottle cools down in the car it will slowly collaps into its self like a giant hand is crushing it from the outside of the bottle and when the bottle reaches the same air as the outside of the bottle

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What type of disorder is myasthenia gravis? A. Immune disorder B. Inflammatory disorder C. Structural disorder D. Infectious dis

Elanso [62]

Myasthenia gravis is a chronic autoimmune neuromuscular disease which means a muscle weakness disorder

3 0

3 years ago

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Calculate the force required to pull a copper ball of radius 1.69 cm upward through a viscous fluid at a constant speed of 9.3 c

strojnjashka [21]

Answer:

$m = \rho V$

Since we have an ball we can consider this like a sphere and the volume is given by $V = \frac{4}{3} \pi r^3 = \frac{4}{3} \pi (1.69cm)^3 = 20.218 cm^3 = 0.00002022 m^3$

The density for the copper is approximately $\rho = 8940 kg/m^3$

So then the mass is :

$m =8940 kg/m^3 * 0.00002022m^3 = 0.1808 Kg$

And now we have everything in order to replace into the formula for F, like this: $F = 0.1808 Kg *9.8 m/s^2 + 0.884 kg/s * 0.093 m/s= 1.772 +0.975 N = 2.747 N$ And that would be the final answer for this case.

Explanation:

For this case if we assume that we have a damping motion the force action on the vertical direction would be:

$F = mg + bv$

Where F represent the upward force on the copper ball

m represent the mass

g = 9.8 m/s^2 represent the gravity

b = 0.884 kg/s represent the proportionality constant

v = 9.3 cm/s = 0.093 m/s represent the velocity

We can solve for the mass from the following expression:

$m = \rho V$

Since we have an ball we can consider this like a sphere and the volume is given by $V = \frac{4}{3} \pi r^3 = \frac{4}{3} \pi (1.69cm)^3 = 20.218 cm^3 = 0.00002022 m^3$

The density for the copper is approximately $\rho = 8940 kg/m^3$

So then the mass is :

$m =8940 kg/m^3 * 0.00002022m^3 = 0.1808 Kg$

8 0

3 years ago

In the water circuit model which part represent the wire 1)pump 2)pipes 3)tap

yaroslaw [1]

Answer:

pipes

Explanation:

3 0

3 years ago

What is work done in physics?

Eddi Din [679]

Answer:

work done is the product of force and distance moved in the direction of a force

6 0

3 years ago

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Calculate the workdone to stretch an elastic string by 40cm if a force of 10 newton produces an extension of 4cm in it

notka56 [123]

Answer:

Workdone = 20 Joules

Explanation:

Given the following data;

Force = 10N

Extension, e = 4cm to meters = 4/100 = 0.04 meters

Workdone extension = 40cm to meters = 40/100 = 0.4 meters

To find the work done;

First of all, we would find the spring constant using the formula;

Force = spring constant * extension

10 = spring constant * 0.04

Spring constant = 10/0.04

Spring constant = 250 N/m

Next, we find the work done;

Workdone = ½ke²

Where;

k is the spring constant.

e is the extension.

Substituting into the formula, we have;

Workdone = ½ * 250 * 0.4²

Workdone = 125 * 0.16

Workdone = 20 Joules

5 0

3 years ago