3 years ago

What type of change occurs when water changes from a solid to a liquid

1 answer:

8 0

What type of change occurs when water changes from solid to a liquid a phase change a physical change and irreversible change both A and the

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A boat with a horizontal tow rope pulls a water skier. She skis off to the side, so the rope makes an angle of 12.0 ∘ with the f

Sladkaya [172]

Answer:

62.601kJ

Explanation:

We have a force with a horizontal component given by the angle of 15°. So wue can take this component to calculate the total work done, that is,

$W_T = Fd(cos\theta)$

Our values are,

$d=320m$

$Angle = 12\°$

$Force=200N$ ,

Substituting in Work equation,

$W_T = 200(320)(cos12)$

$W_T = 62601.4J$

$W_T = 62.601kJ$

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3 years ago

PLS HELP!!

stealth61 [152]

Answer:

Explanation:

The iris controls the amount of light that enters the eye by opening and closing the pupil. The iris uses muscles to change the size of the pupil. These muscles can control the amount of light entering the eye by making the pupil larger (dilated) or smaller (constricted).

8 0

3 years ago

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A boat heads north at 30 mph while a steamer heads east at 40 mph at the same time. When is the distance between them 50 mi? Ans

Reil [10]

Answer:

1 hour

Explanation:

Speed of the first boat = 30 mph

Speed of the second = 40 mph

The boats will cover different distances but the time taken will be the same.

Time taken by the boats = t

Distance = Speed × Time

Distance covered by the first boat = 30t

Distance covered by the second boat = 40t

Distance between the boats = 50 mi

From the Pythagoras theorem

$\sqrt{(30t)^2+(40t)^2}=50\\\Rightarrow \sqrt{2500t^2}=50\\\Rightarrow 50t=50\\\Rightarrow t=\frac{50}{50}=1\ hour$

Time taken by the boats when they are 50 mi away is 1 hour

7 0

3 years ago

What flows in electricity?<br> A. Electrons<br> B. Protons<br> C. Neutrons

nordsb [41]

Answer:

Explanation:

Electrons

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3 years ago

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 2.1 m/s. The

garri49 [273]

Answer:

4.6 Joules

Explanation:

K=1/2*MV^2

1/2 * 2.1kg * 2.1^2m/s

==4.6305 Joules

simplified to 4.6 Joules

7 0

3 years ago