3 years ago

Please helppp....What are 5 examples of real science

Physics

1 answer:

valentina_108 [34]3 years ago

8 0

Answer:

dynamics

kinematics

fluid mechanisms

earth science and

physics

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On earth, 1 kg = 9.8 = 2.2 lbs. On the moon, 1 kg = 1.6 n = 0.37 lbs.

Kruka [31]

They're never 'equal'. 1 kilogram is 1 kilogram everywhere. It weighs about 2.2 pounds on Earth, and it weighs about 0.37 pound on the moon. On the way between, if the rocket engines are not burning, it weighs nothing.

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3 years ago

The molecules of a substance in a particular state of matter move freely with random motion. The average speed of the molecules

Sonja [21]

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A gas

Explanation:

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3 years ago

During a game the same batter swings at a ball thrown by the pitcher and hits a line drive. Just before the ball is hit it is tr

sergeinik [125]

Answer:

The total work on the ball is 36.25 Joules

Explanation:

There is an important principle on classical mechanics that is the work-energy principle it states that the total work on an object is equal the change on its kinetic energy, mathematically expressed as:

$W_{net}=\Delta K = K_f -K_i$ (1)

With W net the total work, Kf the final kinetic energy and Ki the initial kinetic energy. We're going to use this principle to calculate the total work on the baseball by the force exerted by the bat.

Kinetic energy is the energy related with the movement of an object and every classical object with velocity has some kinetic energy, it is defined as:

$K=\frac{mv^2}{2}$

With m the mass of the object and v its velocity, knowing this we can use on:

$W_{net}= \frac{mv_f^2 -mv_i^2}{2}=\frac{m(v_f^2 -v_i^2)}{2}$

In our case vf is the velocity just after the hit and vi the velocity just before the hit. For an average baseball its mass is 145g that is 0.145 kg, then

$W_{net}=\frac{0.145*(30.0^2 -20.0^2)}{2}$