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3 years ago

ILL MARK BRAINLEST

1 answer:

5 0

1. conduction
Heat is transferred when the particles in the hotter side vibrate and collide with the neighbouring particles. The rate of heat transfer is the highest in solid, followed by liquid and then gas. It is because the particles in solid are closely packed together, increasing the frequency of collisions. Heat cannot be transferred in vacuum by conduction because there are no particles.

2. convection
It only applies to fluid, ie gas and liquid. Heat can’t be transferred in solid and vacuum by convection. When the liquid is heated, the hotter part expands in volume, hence lowering its pressure. This part then rises and forces the colder part to sink. This forms a convection current.

3. radiation
This can occur in any situation, including vacuum. All objects emits and absorbs infrared radiation. A hotter object has a higher emission rate than the absorption rate

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What are the chances?

Sindrei [870]

Answer:

what ar the chances of what.

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3 years ago

If a train going 60 m/s hits the breaks, and it takes the train 85 seconds to stop, what is the train´s acceleration

Flauer [41]

Acceleration is change in velocity over time --> $a = \frac{Δv}{t}$

Δv or change in velocity equals the Final velocity minus the initial velocity

Our initial velocity here is 60m/s while our final velocity is 0 m/s

The time interval is 85 seconds so...

$a = \frac{0-60}{85}$

$a = \frac{-60}{85}$

$a = -0.706$

The negative is there to indicate that the train in slowing down or decelerating

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4 years ago

If 400g is 1kg find the ratio in the simplest form

uranmaximum [27]

2:5

Explanation:

400g : 1kg

400g: 1000g

4 : 10

2 : 5

6 0

3 years ago

A block of mass m=16.8 kg is sliding on a surface with initial velocity v=23.2 m/s. The block has a coefficient of kinetic frict

Firdavs [7]

Answer:

t = 23.92 s

Explanation:

Newton's second law:

∑F = m*a Formula (1)

∑F : algebraic sum of the forces in Newton (N)

m : mass s (kg)

a : acceleration (m/s²)

We define the x-axis in the direction parallel to the movement of the block and the y-axis in the direction perpendicular to it.

Forces acting on the block

W: Weight of the block : In vertical direction, downward

FN : Normal force : perpendicular to the floor, upward

fk : Kinetic friction force: parallel to the floor and opposite to the movement

F = 86.4 N , in the direction of the motion

Calculated of the W

W= m*g

W= 16.8 kg* 9.8 m/s² = 164.64 N

Calculated of the FN

We apply the formula (1)

∑Fy = m*ay ay = 0

FN - W = 0

FN = W

FN = 164.64 N

Calculated of the fk

fk = μk*FN

fk = 0.426* 164.64 N

fk = 70.13 N

We apply the formula (1) to calculated acceleration of the block:

∑Fx = m*ax , ax= a : acceleration of the block

F - fk = m*a

86.4 -70.13 = (16.8)*(-a)

16.26 = (16.8)*(-a)

a = -(16.26 )/ (16.8)

a = - 0.97 m/s²

Kinematics of the block

Because the block moves with uniformly accelerated movement we apply the following formula :

vf = v₀ + a*t Formula (2)

Where:

t: time interval (m)

v₀: initial speed (m/s)

vf: final speed (m/s)

Data:

v₀ = 23.2 m/s

vf = 0

a = -0.97 m/s²

Time it takes for the block to stop

We replace data in the formula (2) to calculate the time

vf= v₀+a*t

0 = 23.2+( -0.97)*t

(0.97)*t = 23.2

t = 23.2 / (0.97)

t = 23.92 s

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3 years ago

The field of physics which deals with the study of probability waves that describe the motion and dynamics of particles with mas

goldenfox [79]

Answer:

Option B. quantum mechanics

Explanation:

Quantum Mechanics, at atomic and sub-atomic levels deal with the study of how particles at this level behave and how the matter and energy interacts.

It also explains the properties of atoms, molecules and the particles constituting these.

The wave- particle duality of quantum mechanics that says that matter or every quantum of it exhibits wave as well as particle nature.

This theory was incorporated with its mathematical description given by Schrodinger was also incorporated in the theory for eave-particle duality and The probability for the existence of particle was determined.

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3 years ago