The air contained water that froze at 0 °C
The change in internal energy of the water as it froze was 0.70 kJ The specific latent heat of fusion of water is 330 kJ/kg
Calculate the mass of ice produced.

Answer:

83.34%.

Explanation:

Given that,

Lucy does 12,000 J of work on a machine to help her

The machine exerts a force of 500 N to lift the crate.

Height of the shelf = 20 m

We need to find the efficiency of the machine. The ratio of output work to the input work is called the efficiency of any machine. It is given by :

[tex]\eta=\dfrac{W_o}{W_i}\times 100\\\\=\dfrac{500\times 20}{12000}\\\\=83.34\%[/tex]

So, the efficiency of the machine is 83.34%.

Answer:

83%

Explanation:

just took quiz on connections acadmy

Answer:

the mathematical models, Newton's second law, improve the response of our designs and allow us to modify them to be more resistant.

Explanation:

When an object is designed it is done based on some models or guides, specifically Newton's second law is given in the form

            ∑ F = m a

We can make a design and test with forces applied in several different places and with different intensity, to find weak points in the design, this is done a lot today in the construction of tall buildings, in the design of airplanes; The great advantage of this is that it allows you to see problems without significant cost of money and human lives.

There are also designs that can be modified to improve the response of our system to different external stimuli, this is widely used in the design of bridges, to see the response of the structure before load changes and different climatic conditions.

In summary, the mathematical models, Newton's second law, improve the response of our designs and allow us to modify them to be more resistant.

Answer:

position speed and direction

Explanation:

hope that helps =)

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Answer:

20.55 miles per hour (rounded to the nearest hundredth)

Explanation:

Divide 104 by 5.06

20.55335968379447

Round to the nearest hundredth

20.55

This can also be 20.6

If you round to the nearest tenth

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Answer:

[tex]{\boxed{ \underline{ \sf{Moment \: of \: force}}}}[/tex]

✎ A moment of force is a turning effect caused by a force.

♁ Explanation :

☄ When force is exerted on a body , it results either in displacement of the body or its rotation about a point or axis i.e the rotation of turning effect of force. The turning effect of force acting on a body about an axis is called moment of the force. It may be clockwise or anti - clockwise.

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Answer:

of a moving object?

Any change of speed or direction requires a force. In other words, forces cause acceleration. The direction in which an object moves depends on the direction of the force that is applied to the object. If there is more than one force, the forces work together

Answer:

357KG

Explanation:

In terms of attitude change, the fundamental tenet of the cognitive theory would be that individuals are typically driven to lessen dissonance, which could be accomplished by altering their attitudes but also beliefs.

Cognitive theories concentrate on the premise that how exactly what people think causes the arousal of emotions, suggesting that some thoughts, as well as beliefs, as well as beliefs, contribute to healthy emotions as well as adaptive behavior while others lead to disturbing emotions and behaviors.

When people sense unease or guilt as a result of cognitive dissonance, they can actively lessen the dissonance by altering their attitude, beliefs, and even conduct in relation to it in order to attain consistency with both the contradictory cognitions.

In terms of attitude change, the fundamental tenet of the cognitive theory would be that individuals are typically driven to lessen dissonance, which could be accomplished by altering their attitudes but also beliefs.

To know more about attitude change

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Answer:

Explanation:

speed = distance / time

           = 15m / 3sec

           = 5 m/sec

Answer:

5 m/s

Explanation:

The equation for speed is distance/time. The distance, 15, will go over the time, 3. So, we have 15/3.

You can simplify this by dividing both sides by 3. 15/3 is 5. 3/3 is 1. Now we have 5/1, with 5 as meters, 1 and second.

Therefore, the correct answer is 5 m/s.

Hope I helped!!!!!!!

Answer:

Total time taken t = 2.03 s (Approx)

Explanation:

Given:

Initial speed u = 20 m/s

Height h = 40 m

g = 9.81 m/s²

Find:

Total time taken t

Computation:

v = u + gt

0 = 20 + 9.81(t)

Total time taken t = 2.03 s (Approx)

Answer:

150 m/s²

Explanation:

Plz like

Answer:

150 m/s²

Explanation:

Answer:

I think it is b because when you do something to an object it moves

Answer:

Explanation:

net force on the skier = mg sin 39 - μ mg cos39

mg ( sin39 - μ cos39 )

= 73 x 9.8 ( .629 - .116)

= 367 N

impulse = net force x time = change in momentum .

= 367 x 5 = 1835 kg m /s

velocity of the skier after 5 s = 1835 / 73

= 25.13 m /s

b )

net force becomes zero

mg ( sin39 - μ cos39 ) = 0

μ = tan39

= .81

c )

net force becomes zero , so he will continue to go ahead with constant speed of 25.13 m /s

so he will have speed of 25.13 m /s after 5 s .

Answer:

The pressure of liquid column is given by p=hpg, where h is depth, p is density and g is acceleration due to gravity.

Therefore, pressure of the liquid column increases with depth. The height of the blood column in a human body is more at feet than at the brain. Therefore, the blood pressure in humans is greater at the feet than the brain.

Answer:

the above answer is correct hope it's help you have a great day ☺☺keep smiling be happy stay safe

Answer:

Explanation:

Net work done on the box = increase in kinetic energy

= 1 / 2 x 10 ( 5² - 3² )

= 80 J .

Answer:

The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution. A concentrated solution is one that has a relatively large amount of dissolved solute. A dilute solution is one that has a relatively small amount of dissolved solute.

Explanation:

Answer:

C ( is hard to refuse in the situation if you have not decided how you would handle it ahead of time

B: because it is very likely you will face these situation in the future)

Answer:

The deceleration is  [tex]a = -0.7273 \ m/s^2[/tex]  

Explanation:

From the question we are told that

  The distance of the car from the crossing is [tex]d = 360 \ m[/tex]

   The speed is [tex]u = 16 \ m/s[/tex]

    The reaction time of the engineer is  [tex]t = 0.53 \ s[/tex]

Generally the distance covered during the reaction time is  

      [tex]d_r = u * t[/tex]

=>   [tex]d_r = 16 * 0.53[/tex]

=>   [tex]d_r = 8.48 \ m[/tex]

Generally distance of the car from the crossing after the  engineer reacts is

      [tex]D = d- d_r[/tex]        

=> [tex]D = 360 - 8.48[/tex]      

=> [tex]D = 352 \ m[/tex]

Generally from kinematic equation

      [tex]v^2 = u^2 + 2as[/tex]

Here v is the final velocity of the car which is  0 m/s

So

        [tex]0^2 = 16^2 + 2 * a * 352[/tex]

=>    [tex]a = -0.7273 \ m/s^2[/tex]  

Answer:

Its to make sure that the results are reliable.

If you make only one test, the person could have messed up so if there is a twin test, you know something is screwed up in the results so they know the try again and make sure they don't skrew up again.

Explanation:

Answer:

t = 3.8 [s]

Explanation:

To solve this problem we must use the following equation of kinematics.

[tex]v_{f} =v_{o} -a*t[/tex]

where:

Vf = final velocity = 5 [m/s]

Vo = initial velocity = 13 [m/s]

a = desacceleration = 2.1 [m/s²]

t = time [s]

As we can see in the above equation the acceleration is negative because the car slows down its velocity.

5 = 13 - 2.1*t

2.1*t = 13 - 5

t = (8)/2.1

t = 3.8 [s]

Answer:

In physics we call it power

Answer:

Sonia's grandfather was not able to see clearly after returning from his walk on a bright sunny day. He was about to hit a chair when Sonia held him and guided him to the nearby sofa, in sunny environment grandfather's eye is set according to high brightness, his pupils become small to lower the number of light rays entering his eye, when he returned from sunny environment to his house which was having low brightness so the pupils should enlarge to absorb more light to see clearly but due to old age his Ciliary muscle of the eye would have worn out and due to this poor coordination the image was not clear.

Answer:

6.266829864 g

Explanation:

Answer:

40

Explanation:

1000 divided by 25 is 40

Answer:

number of Protons=16

number of Neutrons=16

number of electrons=32

Explanation:

Tip:-

Always the number of protons = the number of neutrons.

Add them and you will get the number of electrons.

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Answer:  the difference between a Structure is from the Latin word structura which means "a fitting together, building." Although it's certainly used to describe buildings, it can do more than that and a In physical cosmology the inflationary epoch was the period in the evolution of the early universe when, according to inflation theory, the universe underwent an extremely rapid exponential expansion.

Explanation:

Answer:Δx=v0t + 1/2 at 2

Answer:

4800

Explanation:

80*60=4800

Complete Question:

A student has been assigned to measure the density of an irregularly shaped piece of metal.

Which apparatus would be most appropriate to carry out this task?

Group of answer choices

A. ruler, balance

B. beaker, crucible

C. flask, Bunsen burner

D. graduated cylinder, balance

Answer:

D. graduated cylinder, balance

Explanation:

In this scenario, A student has been assigned to measure the density of an irregularly shaped piece of metal.

The apparatus which would be most appropriate to carry out this task is a graduated cylinder and balance.

A graduated cylinder can be defined as a measuring cylinder used for the measurement of the volume of an irregularly shaped piece of metal or liquids. It is typically marked with horizontal lines on its side as units of measurement for volume. The balance is then used to weigh the metals mass.