PHYSICS
HIGH SCHOOL

Answer: Conversation of momentum is a law of physics which states that the momentum of a system is constant if there are no external forces acting on the system. it’s embodied in Newton’s first law (the law of inertia)

MIDDLE SCHOOL

When you move your muscles, chemical energy in the cells is converted into mechanical and thermal energy. What is this an example of? A.Law of nutrition

B.Law of conservation of energy

C.Theory of photsynthesis

D.Theory of kinetics

please help!

Answer:

B.Law of conservation of energy

Explanation:

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.

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Answer:

Law of conservation of energy

Explanation:

HIGH SCHOOL

Find the ratio of the radii of a baseball to the Earth, knowing that the radius of a baseball is .09 m, and that the Earth's radius is 6.37 x 10^6 m.

0.09 / 6.37 x 10⁶ = 1.4129 x 10⁻⁸

The radius of the baseball is 1.4129 x 10⁻⁸ the radius of the Earth.

The radius of the baseball is 1.4129 x 10⁻⁸ the radius of the Earth.

HIGH SCHOOL

Explain the similarities between a car at rest and a car traveling at a constant velocity.

The similarity between a car at rest and a car moving at constant velocity is that the both cars have zero acceleration. the car at rest is not moving so its acceleration should also be zero. for the car at constant velocity, since the velocity of the car is not changing, and acceleration is change in velocity per time, that it why it is also zero

COLLEGE

The atmospheric pressure on the top of the Engineering Sciences Building (ESB) is 97.6 kPa, while that in Room G39-ESB (ground floor) is 98.2 kPa. Determine the height of the building if the air density is assumed to be independent of the height, being 1.16 kg/m³, while the acceleration of gravity is 9.81 N/kg.

Answer:

Δ h = 52.78 m

Explanation:

given,

Atmospheric pressure at the top of building = 97.6 kPa

Atmospheric pressure at the bottom of building = 98.2 kPa

Density of air = 1.16 kg/m³

acceleration due to gravity, g = 9.8 m/s²

height of the building = ?

We know,

Δ P = ρ g Δ h

(98.2-97.6) x 10³ = 1.16 x 9.8 x Δ h

11.368 Δ h = 600

Δ h = 52.78 m

Hence, the height of the building is equal to 52.78 m.

HIGH SCHOOL

Two waves can share the same space and pass through one another. What type of interference occurs when the crests of one wave overlaps with the crests of another wave? A: Overlapping interference.

B: Standing interference.

C: Destructive interference.

D: Constructive interference.

E: Positive interference.

D is the correct answer. Constructive Interference occurs when the crests of one wave overlaps with the crests of another wave. The reason it is called "constructive" is because one wave is adding energy to another wave. Hope this helps!

Answer: D

I hope this helps and have a wonderful day filled with joy!!

I hope this helps and have a wonderful day filled with joy!!

MIDDLE SCHOOL

J. J. Thomson's experiments with cathode rays ended up _____

Being completely wrong

HIGH SCHOOL

Sound travels at a rate of 340 m/s in all directions through air. Matt rings a very loud bell at one location, and Steve hears it some time later at his location 450 meters to the south. How long did it take the sound to travel from the bell to Steve's location?

Distance= speed x time

450=340xt

t=450/340

t=1.32s

450=340xt

t=450/340

t=1.32s

(450 meters) x (second / 340 meters) = 1.324 seconds (rounded)

MIDDLE SCHOOL

A train travels 55 km, south along a straight track in 34 minutes. What is the train's average velocity in kilometers per hour?

Answer:

96.5 km/h south

Explanation:

The average velocity is given by:

where

d is the displacement

t is the time

We have:

d = 55 km

Therefore, the average velocity is

And the direction is the same as the displacement (south)

HIGH SCHOOL

Converting 16.2 pounds to 1 newton

16.2 pounds doesn't convert to 1 newton.

It converts to about 71.1 newtons

1 pound force is the same force as 4.448... newtons (rounded).