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3 years ago

If a substance changes from a vapor to a liquid it ____ HELP FAST

Physics

1 answer:

alisha [4.7K]3 years ago

5 0

Answer:

Explanation:

Condensing is the word used to indicate the change of state of a substance from vapor to liquid, as in this case. During condensation, the substance releases thermal energy to the environment, therefore the kinetic energy of the molecules in the vapor decreases until they become closer to each other and they start to be affected by the intermolecular forces and so the substance becomes a liquid.

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A 5.0 V battery storing 43.0 kJ of energy supplies 1.5 A of current to a circuit. How much energy does the battery have left aft

Free_Kalibri [48]

Answer:

B. 16 kJ

Explanation:

Energy = VIt.............. Equation 1

Where V = Voltage, I = Current, t = time

Given: V = 5.0 V, I = 1.5 A, t = 1 h = 3600 s.

Substitute these values into equation 2

E = 5.0(1.5)(3600)

E = 27000 J

E = 27 kJ.

Amount of energy left = 43 kJ - 27 kJ

Amount of energy left = 16 kJ.

Hence the right option is B. 16 kJ

3 0

3 years ago

A bicycle is traveling with a speed of 12 m/s. The cyclist hits the brakes reducing the speed to 4 m/s in a time of 4.8 seconds.

Annette [7]

So, the acceleration of the bicycle is approximately <u>-1.67 m/s²</u> or it can be said to be decelerating approximately <u>1.67 m/s²</u>.

<h3>Introduction</h3>

Hi ! Here I will help material about linear motion changes regularly, which is where you will hear a lot of the term acceleration. Acceleration occurs when an object's speed increases in a certain time interval. Acceleration can be negative which is called deceleration. The relationship between acceleration with velocity and time is manifested in the equation:

$\boxed{\sf{\bold{a = \frac{v_2 - v_1}{t}}}}$

With the following conditions :

a = acceleration (m/s²)
$\sf{v_2}$ = object's final velocity (m/s)
$\sf{v_1}$ = object's initial velocity (m/s)
t = interval of the time (s)

<h3>Problem Solving </h3>

We know that :

$\sf{v_2}$ = object's final velocity = 4 m/s
$\sf{v_1}$ = object's initial velocity = 12 m/s
t = interval of the time = 4.8 s

What was asked :

a = acceleration = ... m/s²

Step by step :

$\sf{a = \frac{v_2 - v_1}{t}}$

$\sf{a = \frac{4 - 12}{4.8}}$

$\sf{a = \frac{-8}{4.8}}$

$\boxed{\sf{a \approx -1.67 \: m/s^2}}$

So, the acceleration of the bicycle is about -1.67 m/s² or it can be said to be decelerating around 1.67 m/s².

8 0

3 years ago

A box of books weighing 325N moves at a constant velocity across the floor when the box is pushed with a force of 425 N exerted

iragen [17]

Answer:The coefficient of kinetic friction is 0.61

Explanation:A state of constant velocity connotes an acceleration equal to zero {this is evident from Acceleration=(final velocity-initial velocity)/time}

Consequently,a balanced forces system is attained

Force of pulling

F(x)=F×cosα=425N×0.817=347N

is equivalent to the resistance force.

F=U(k)×(Fw+Fsinα)=U(k)×(325N+425N×0,576)=U(k)×570N

Note; U(k) is the coefficient of kinetic friction

Equating the two force components,

The coefficient of static friction ×570N= 347N

The coefficient of static friction = 347N/570N

The coefficient of static friction =0.61

Please note that the coefficient of static friction is dimensionless .

This is as a result of the same unit of forces whose division resulted in the determination of the coefficient of kinetic friction.

5 0

3 years ago

True or false: Being highly creative is a behavior leading to self-actualization.

GuDViN [60]

True.<span>
Self<span>-actualization brings about self-satisfactions and a sense of self-worth.
When someone is highly creative and creates something successfully, he or she feels motivated and feels that he or she has finally achieved his or her goal. Nothing better than this can lead to self</span>-actualization. </span>

3 0

3 years ago

Please help<br> Right answers please<br> Will mark brainliest

balandron [24]

Answer:

a. 45 N. / b. 0.08 m/s^2. / c. 102 N

F = ma

F = 15(3)

F = 45 newtons

F/m = a

20/250 = a

0.08 m/s^2 = a

R = ma

R =1.5(68)

102 N

3 0

4 years ago