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3 years ago

If the output work of a simple machine equals the input work, the machine is said to have ______ efficiency.

1 answer:

7 0

If the output work of a simple machine equals the input work, the machine is said to have 100% efficiency.

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What happens when energy is added to a liquid without changing its phase

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the mole of the substance will boiling or freezing point ,

all of it melt or boiled,but the temperature won't change

water boil at 212°F (100°C)

energy remove and it will be ice

if energy is added to the matter

hope you understand!!!!!!!!!!!

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3 years ago

Galileo was a contemporary of

Vitek1552 [10]

Brahe & Kepler

Answer from Quizlet

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3 years ago

As a woman walks, her entire weight is momentarily placed on one heel of her high-heeled shoes. Calculate the pressure exerted o

STatiana [176]

Answer:

3335400 N/m² or 483.75889 lb/in²

Explanation:

g = Acceleration due to gravity = 9.81 m/s²

A = Area = 1.5 cm²

m = Mass of woman = 51 kg

F = Force = mg

When we divide force by area we get pressure

$P=\frac{F}{A}\\\Rightarrow P=\frac{mg}{A}\\\Rightarrow P=\frac{51\times 9.81}{1.5\times 10^{-4}}\\\Rightarrow P=3335400\ N/m^2$

$1\ N/m^2=\frac{1}{6894.757}\ lb/in^2$

$3335400\ N/m^2=3335400\times \frac{1}{6894.757}\ lb/in^2=483.75889\ lb/in^2$

The pressure exerted on the floor is 3335400 N/m² or 483.75889 lb/in²

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3 years ago

If an object falls for 4 seconds, how fast is it going when it hits the ground?

MArishka [77]

Acceleration due to gravity is about 9.8 m/s²

So after every second, the speed increase by 9.8 m/s

After 1 second, the object would fall at a speed of 9.8 m/s

After 2 seconds the object would fall at a speed of 19.6 m/s

So after 4 seconds, the object is going to be at a speed of:

9.8 x 4 = 39.2 m/s

-------------------------------------------------

Answer

39.2 m/s

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4 years ago

How much time does it take light to travel from the moon to the earth, a distance of 384000 km?

Natali5045456 [20]

Answer:

1.28second

Explanation:

The speed of light is constant everywhere, it is

299,792,458m/s=299,792.458km/s

Therefore it takes

$\frac{384000}{299792458} = 1.28sec$

6 0

1 year ago

If the output work of a simple machine equals the input work, the machine is said to have ______ efficiency.​

If the output work of a simple machine equals the input work, the machine is said to have ______ efficiency.