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3 years ago

How is the average kinetic energy of particles related to temperature of a substance?

Physics

1 answer:

zubka84 [21]3 years ago

6 0

As kinetic energy increases, substance temperature increases

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In a downtown office building, you notice each of the four sections of a rotating door has a mass of 75 kg. What is the width, i

DENIUS [597]

Answer:

each door has a width of 2.666 meters

Explanation:

from Newton's second law applied to rotational motion:

ζ = I α

where ζ= torque , I = moment of inertia , α = angular acceleration

the moment of inertia for a flat plate around its central axis is

I = 1/12 m a² , where m= mass, a= total width = 2L

therefore the moment of inercia for a flat plate with length 2L ( 2 doors, one in each side of the central axis) is

I1 = 1/12 m (2L)² = 1/3 m L²

if we have 4 doors , that is 2 flat plates with length of 2L perpendicular to each other:

I = Ix + Iy = 2*I1 = 2/3 m L²

thus

ζ = I α

4* F * L = 2/3 * (4*m) L² * α

L = 3/2* F/ ( m*α) = 3/2* 56 N / ( 75 Kg * 0.420 rad/seg²) = 2.666 m

8 0

3 years ago

A 30.0-kg box is being pulled across a carpeted floor by a horizontal force of 230 N , against a friction force of 210 N . What

olga2289 [7]

Answer:

0.67 m/s² or 2/3 m/s²

3 m

Explanation:

Using

F-F' = ma............ Equation 1

Where F = Horizontal force applied to the box, F' = Frictional force, m = mass of the box, a = acceleration of the box.

make a the subject of the equation

a = (F-F')/m............ Equation 2

Given: F = 230 N, F' = 210 N, m = 30 kg.

substitute into equation 2

a = (230-210)/30

a = 20/30

a = 0.67 m/s² or 2/3 m/s²

The acceleration of the box = 2/3 m/s²

Using,

s = ut+1/2at²............ Equation 3

Where u = initial velocity, t = time, a = acceleration, s = distance.

Given: u = 0 m/s (from rest), t = 3 s, a = 2/3 m/s²

substitute into equation 3

s = 0(3)+1/2(2/3)(3²)

s = 3 m.

Hence the box moves 3 m

7 0

3 years ago

Two identical cars A and B are at rest on a loading dock with brakes released. Car C, of a slightly different style but of the s

Sidana [21]

Answer:

V(c)' = 0.325 m/s

V(a)' = 2.19375 m/s

V(b)'' = 0.73125

Explanation:

See attachment for explanation.

7 0

3 years ago

A car drives 23 m/s east for 35 seconds. What is the displacement of the car

DedPeter [7]

Answer:

B. 805 m east

Explanation:

Δx = (23 m/s east) (35 s)

Δx = 805 m east

5 0

3 years ago

1. Find the total resistance passing through the circuit. Then find the total current passing

sdas [7]

Answer: The circuit depicted at the right is an example of the use of both series and parallel connections within the same circuit. In this case, light bulbs A and B are connected by parallel connections and light bulbs C and D are connected by series connections. This is an example of a combination circuit.

Explanation:

3 0

3 years ago