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3 years ago

The collision of objects which generates thermal energy is called _______________________________

Physics

2 answers:

Grace [21]3 years ago

4 0

Power
...............

Lubov Fominskaja [6]3 years ago

3 0

Answer:

a. Conduction

Explanation:

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A wheel of diameter 78 cm has an axle of diameter 14.8 cm. A force 150 N is exerted along the rim of the wheel.What force should

bezimeni [28]

Answer:

F = 263.51 N

Explanation:

given,

diameter of wheel = 78 cm

diameter of axle = 14.8 cm

Force exerted on the rim of wheel = 150 N

Force applied outside the axle = ?

To prevent rotation wheel from rotating the Force 'F' should be applied outside of the axle.

Net momentum about the center of mass should be zero

now,

Moment of about center due to 150 N = moment about center due to F on axle

$50\times \dfrac{78}{2}=F\times \dfrac{14.8}{2}$

7.4 F = 1950

F = 263.51 N

Hence, Force exerted outside of the axle in order to prevent the wheel from rotating is equal to 263.51 N.

6 0

4 years ago

Me - HS_SCLPhysical Science,

nalin [4]

Answer:

What's the question

Explanation:

3 0

4 years ago

What formula gives the strength of an electric field, E, at a distance from a known source charge?

Deffense [45]

<h2>Hello!</h2>

The answer is: Coulomb's law equation.

The Coulomb's law states that the strength of an electric field (between two charges) can be calculated by multiplying their charges and dividing it into the square of the distance between their centers.

$E=\frac{k*q*Q}{d^{2} }$

Where:

E = Electric Field Strenght

$k=9.0*10^{9} \frac{N.m^{2} }{C^{2} }$

$q=TestCharge\\Q=SourceCharge\\$

d = separation between charges (m)

Have a nice day!

5 0

4 years ago

Read 2 more answers

Diego is trying to lift a piano to the second floor of his house. Diego uses a pulley system and gives a big lift to the piano.T

Mila [183]

Answer:

Correct Answer is positive force → balanced force → negative force

Explanation:

When Diego gives a big lift to the piano with the help of pulley system that time, initially piano moves upward so positive force acts on it.

Later, Piano stops, in this condition balanced force act on it since force applied by Diego is balanced by gravitational force of earth.

After some time piano starts falling in this condition negative force will act on the piano. In this condition, gravitational force will acts on piano in downward direction.

3 0

4 years ago

Read 2 more answers

A carnot heat engine receives 600 kj of heat from a source of unknown temperature and rejects 175 kj of it to a sink at 20°c. de

oee [108]

(b) 71%

The thermal efficiency of a Carnot heat engine is given by:

$\eta = \frac{W}{Q_{in}}$

where

W is the useful work done by the engine

$Q_{in}$ is the heat in input to the machine

In this problem, we have:

$Q_{in}=600 kJ$ is the heat absorbed

$W=600 kJ-175 kJ=425 kJ$ is the work done (175 kJ is the heat released to the sink, therefore the work done is equal to the difference between the heat in input and the heat released)