PHYSICS MIDDLE SCHOOL

Which change is the best example of a physical change?1) a cookie baking
2) paper burning
3) ice cream melting
4) a nail rusting

Answers

Answer 1

Answer: The answer would be a nail rusting, but really it could be any of these.

Answer 2

Answer:

Answer: 3

Explanation:

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Suppose you increase your walking speed from 6 m/s to 11 m/s in a period of 2 s. What is your acceleration?

Answers

Given

velocityΔ v₁ = 6m/s

v₂ = 11m/s

Δ time = Δ t = 2s

sign / indicate as division.

acceleration a = Δv/ Δt

a = (v₂-v₁) / Δt

a = (11m/s -6m/s ) / 2s

a = (5m/s) / 2s

accerelation a = 2.5m

I got 2.5, hope it works

The leg's force forward on the foot= 500NThe foot's force forward on the ball= 500N
The ball's force back on the foot= 500N
What is the net force on the ball?
What is the net force on the foot?

Answers

There's so much going on here, in a short period of time.

Before the kick, as the foot swings toward the ball . . .

-- The net force on the ball is zero. That's why it just lays there and
does not accelerate in any direction.

-- The net force on the foot is 500N, originating in the leg, causing it to
accelerate toward the ball.

During the kick ... the 0.1 second or so that the foot is in contact with the ball ...

-- The net force on the ball is 500N. That's what makes it accelerate from
just laying there to taking off on a high arc.

-- The net force on the foot is zero ... 500N from the leg, pointing forward,
and 500N as the reaction force from the ball, pointing backward.

That's how the leg's speed remains constant ... creating a dent in the ball
until the ball accelerates to match the speed of the foot, and then drawing
out of the dent, as the ball accelerates to exceed the speed of the foot and
draw away from it.

Whenever the motion of an object change,____ has been applied.

Answers

Whenever the motion (speed or direction) of an object changes, we say that acceleration has occurred. From Newton's First Law of Motion, we know that force has been applied to the object.

A class of students is modeling how waves propagate through a medium. Each student in the class represents particle in the medium. An envelope represents the energy transferred by the wave. Which of the following scenarios would accurately model a wave propagating from one side of the room to the other?

Answers

C: "The students pass the envelope from one student to the next until it travels across the room."

To quote ck12, "The particles of the medium just vibrate in place. As they vibrate, they pass the energy of the disturbance to the particles next to them, which pass the energy to the particles next to them, and so on."

A 2.0 kg guinea pig runs at a speed of 1.0 m/s what is the guinea pigs kinetic energy

Answers

The kinetic energy (KE) is calculated using the formula KE = 1/2 * m * v^2, resulting in a kinetic energy of 1.0 Joule for a 2.0 kg guinea pig moving at a speed of 1.0 m/s.

The kinetic energy (KE) of an object in motion is determined by the formula: KE = 1/2 * m * v^2, where m is the mass and v is the velocity. For the guinea pig in question, with a mass (m) of 2.0 kg and a velocity (v) of 1.0 m/s, the calculation is as follows:

KE = 1/2 * 2.0 kg * (1.0 m/s)^2

KE = 1/2 * 2.0 kg * 1.0 m^2/s^2

KE = 1.0 kg * 1.0 m^2/s^2

KE = 1.0 Joule

Therefore, the kinetic energy of the 2.0 kg guinea pig running at a speed of 1.0 m/s is 1.0 Joule.

The kinetic energy for the above data is 1.0000 J.

Which has more inertia a shopping cart full of groceries or an empty shopping cart

Answers

Ok, so you would want to define inertia before trying to answer the question. Inertia is basically the force of resistance on an object, or any change to its speed, because of natural factors, like friction or gravity. The shopping carts decribed above, based upon the definition of inertia, the shopping cart full of groceries would have more inertia.

Final answer:

Inertia is a property of an object that resists changes in motion, and its quantity is directly proportional to the object's mass. Therefore, a shopping cart full of groceries, having a greater mass, will exhibit more inertia than an empty shopping cart.

Explanation:

In physics, inertia refers to the tendency of an object to resist changes in its motion. The greater an object's mass, the greater its inertia, making it harder to start or stop its movement. In comparing a shopping cart full of groceries and an empty one, the cart full of groceries will have a higher mass, thus a greater inertia.

Consider an experiment where you exert the same amount of force on both carts. The full cart would be more resistant to change in motion and would move slower or a shorter distance than the empty one due to the higher inertia it possesses.

The same principle can be applied to a group of students using two carts (A and B) for a one-dimensional collision experiment. Cart B with unknown mass is initially at rest while cart A with known mass moves towards it. Since mass directly influences inertia, if cart B was loaded with materials (like a shopping cart full of groceries), it would be harder to shift its motion than if it were empty.