PHYSICS HIGH SCHOOL

Ok i bet none of you guys/girls can get this right there's three states of matter solidliquid solid gas but what is the fourth one? 42 points!

Answers

Answer 1
Answer:

Answer:

plasma is the 4th state
Answer 2
Answer:

Answer:

plasma in the 4th state

Explanation:

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A girl who is watching a plane fly tells her friend that the plane isn’t moving at all. Describe a frame of reference in which the girl’s description would be true

Answers

In the frame of reference of the passengers, flight attendants,
pilot ... anybody ON the plane ... the plane isn't moving at all.

A car rolls down a hill from rest and reaches a velocity of 18.0 m/s in a distance of 25.0m. Find the acceleration of the cart.

Answers

Answer:

I’m so sorry I tried solving it but I don’t understand it can you explain the question a little bit more ty

Explanation:

On a horizontal frictionless surface a mass M is attached to two light elastic strings both having length l and both made of the same material. The mass is displaced by a small displacement Δy such that equal tensions T exist in the two strings, as shown in the figure. The mass is released and begins to oscillate back and forth. Assume that the displacement is small enough so that the tensions do not change appreciably. (a) Show that the restoring force on the mass can be given by F = -(2T∆y)/l (for small angles) (b) Derive an expression for the frequency of oscillation.

Answers

Answer:

ω = √(2T / (mL))

Explanation:

(a) Draw a free body diagram of the mass.  There are two tension forces, one pulling down and left, the other pulling down and right.

The x-components of the tension forces cancel each other out, so the net force is in the y direction:

∑F = -2T sin θ, where θ is the angle from the horizontal.

For small angles, sin θ ≈ tan θ.

∑F = -2T tan θ

∑F = -2T (Δy / L)

(b) For a spring, the restoring force is F = -kx, and the frequency is ω = √(k/m).  (This is derived by solving a second order differential equation.)

In this case, k = 2T/L, so the frequency is:

ω = √((2T/L) / m)

ω = √(2T / (mL))

What is static electricty?

Answers

its started by the friction of two things. example, you know when you have a blanket and it starts going "zap zap zap" your creating static electricty.

Could you give me 4 examples of acceleration??

Answers

Certainly.

1). A driver presses the gas and the car speeds up.

2). A driver presses the brake and the car slows down.

3). A driver turns the steering wheel slightly. The car's speed doesn't change
as it goes around the curve.

4). A stone is tossed into the air. Gravity accelerates it from the moment it
leaves the thrower's hand until it hits the ground.

5). A new TV satellite is successfully launched and placed in a perfect circular
orbit around the Earth. The satellite's motion is accelerated forever, 24/7/365 .

"Acceleration" means any change in the speed or direction of motion.  Any
object that's not moving at constant speed in a straight line is accelerated.

a piano of mass 852 kg is lifted to height of 3.5m how much gravitational potential energy is added to the piano acceleration due to the gravity is g=9.8 m/s2

Answers

Gravitational potential energy added =

                   (mass) x (gravity) x (distance lifted)

                 =  (852 kg) x (9.8 m/s²) x (3.5 m)

                 =  (852 x 9.8 x 3.5)  kg-m²/s²

                 =        29,223.6  joules
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