What is the kinetic energy of a 1.40 kg discus with a speed of 22.5 m/s?

Answers

Answer 1

Answer: Kinetic energy = (1/2) (mass) (speed)²

   = (1/2) (1.4 kg) (22.5 m/s)²

   = (0.7 kg) (506.25 m²/s² )

   = 354.375 kg-m²/s² = 354.375 joules .

This is just the kinetic energy associated with a 1.4-kg glob of
mass sailing through space at 22.5 m/s. In the case of a frisbee,
it's also spinning, and there's some additional kinetic energy stored
in the spin.

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A solid rubber stopper has a mass of 33.0 grams and a volume of 30.0 cm3. What is the density of rubber?

Answers

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Solar cells convert what type of energy into electrical energy?

Answers

In what must certainly rank as one of the most startling coincidences
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If you lift a 16 kg child from the floor to her bed, which is 1 meter high, how much have you increased her potential energy.

Answers

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Which term describe the substance that forms when two or more types of atoms join?A. element
B. compound
C. composite
D. mixture

Answers

Answer:

A. element

Explanation:

A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.

C i’m pretty sure but don’t take me as your first answer i just need to answer a question to ask one.

What happens to a mirror when a ray is directed at it

Answers

Nothing happens to the mirror.

However, if the ray is within some suitable range of
wavelengths, the ray is reflected from the mirror's surface.

If a transformer has a primary with 100 V and fifty coils, and a secondary that yields 20 V, how many coils are on the secondary? a.) 200 b.) 20 c.) 50 d.) 10 e.) 100

Answers

Ideally, if all the magnetic of one winding cuts the other winding, and there isn't any loss in the transformer core or the resistance of the wire, then the voltage across each winding is proportional to the number of turns in its coil.

If you apply 100 V to a winding of 50 turns, then a winding that yields 20 volts
must be wound with

(20/100) of 50 turns = 10 turns

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