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3 years ago

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Why does heat cause a substance to expand? I. Heat causes the substance's atoms or molecules to move faster. II. The substance g

ets larger because it converts heat to mass. III. Heat drives water into the spaces between atoms or molecules.

1 answer:

Vikentia [17]3 years ago

6 0

Heat causes the substance's atoms or molecules to move faster.

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A) Calculate the pressure of water at the bottom of a well if the depth

Molodets [167]

Answer: 98000pa

Explanation:Given,

Depth(h)=10m

gravity(g)=9.8m/s

density(δ)=1000kg/m^3

we know,

P=hdg

P=10*1000*9.8

P=98000pa

7 0

3 years ago

New attempt is in progress. Some of the new entries may impact the last attempt grading. Incorrect. The hammer throw is a track-

Morgarella [4.7K]

This question involves the concepts of centripetal force, range of projectile and projectile motion.

The magnitude of centripetal force is "2812.8 N".

First, we will find the velocity of the ball by using the formula of the range of the projectile.

$R = \frac{v^2Sin2\theta}{g}$

where,

R = range of projectile = 86.75 m

v = speed = ?

θ = launch angle = 47.9°

g = acceleration due to gravity = 9.81 m/s²

Therefore,

$86.75\ m = \frac{(v)^2Sin(2)(47.9^o)}{9.81\ m/s^2}\\\\v = \sqrt{\frac{(86.75\ m)(9.81\ m/s^2)}{Sin95.8^o}}$

v = 29.25 m/s

Now, we will use the formula to find out the centripetal force:

$F_c = \frac{mv^2}{r}$

where,

$F_c$ = Centripetal Force = ?

m = mass of the ball = 7.3 kg

v = speed = 29.25 m/s

r = radius = 2.22 m

Therefore,

$F_c = \frac{(7.3\ kg)(29.25\ m/s)^2}{2.22\ m}$

<u>Fc = 2812.8 N = 2.812 KN</u>

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Learn more about centripetal force here:

brainly.com/question/11324711?referrer=searchResults

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3 years ago

Which statement explains how planets move in orbit as supported by Newton’s first law of motion?

GuDViN [60]

Answer:

C

Explanation:

got a one hundred on the test

5 0

3 years ago

Read 2 more answers

A heat engine: A) converts heat input to an equivalent amount of workB) converts work to an equivalent amount of heat C) takes h

Masja [62]

Answer:

C. Takes heat in, does work, and loses energy heat.

Explanation:

Heat engine is a system makes use of thermal energy (heat) to in order to do mechanical work.

This occurs by converting the heat into mechanical energy. This energy is then used to do work.

The key characteristic of a heat engine is that the substance with which work is done by, goes from a higher temperature to a lower temperature.

Hence, it loses heat as it does work.

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3 years ago

The si unit of mass is the Newton. True or false.

LUCKY_DIMON [66]

False it’s the unit of force

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3 years ago