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3 years ago

How do objects and substances in motion have kinetic energy

Physics

1 answer:

Fiesta28 [93]3 years ago

6 0

Answer:

Explanation:

Kinetic energy is one of the types of mechanical energy and it is the energy due to the object in motion.

Kinetic energy is given as 1/2mv^2

A body cannot have a K.E when it is not in motion because of the velocity

Velocity is the change is position of an object or particle with time taken, so if the object doesn't change it position then it won't have velocity.

kinetic energy (KE) of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.

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The electron gun in a television tube is used to accelerate electrons with mass 9.109 × 10−31 kg from rest to 3 × 107 m/s within

zaharov [31]

Answer:

Electric field, E = 40608.75 N/C

Explanation:

It is given that,

Mass of electrons, $m=9.1\times 10^{-31}\ kg$

Initial speed of electron, u = 0

Final speed of electrons, $v=3\times 10^7\ m/s$

Distance traveled, s = 6.3 cm = 0.063 m

Firstly, we will find the acceleration of the electron using third equation of motion as :

$a=\dfrac{v^2-u^2}{2s}$

$a=\dfrac{(3\times 10^7)^2}{2\times 0.063}$

$a=7.14\times 10^{15}\ m/s^2$

Now we will find the electric field required in the tube as :

$ma=qE$

$E=\dfrac{ma}{q}$

$E=\dfrac{9.1\times 10^{-31}\times 7.14\times 10^{15}}{1.6\times 10^{-19}}$

E = 40608.75 N/C

So, the electric field required in the tube is 40608.75 N/C. Hence, this is the required solution.

3 0

3 years ago

A high speed train travels with an average speed of 227 km/h. The train travels for 2 h.how far does the train travel in meters?

Sedbober [7]

2 x 227 km/h = 454 m

8 0

3 years ago

Read 2 more answers

What do electricians call disconnects or disconnecting?

muminat

Service disconnect
this is the first disconnect device after the utility meter.

4 0

1 year ago

Light is an oscillating electric field alone. an oscillating electric field and a fluctuating magnetic field that are parallel t

Kaylis [27]

Answer:

d) True light is the two fluctuating perpendicular fields

Explanation:

When we solve Maxwell's equations for this system, it results in a traveling wave that is perpendicular to the two fields.

Let's analyze the affirmations

a) False. The light needs both fields

b) False violates Lenz's law

c) False. The two fields are perpendicular

d) True two fluctuating perpendicular fields

e) Falos needs both fields

Correct answer d)

6 0

3 years ago

Two uniform bars of the same dimensions are constructed from the same material. One bar has five evenly spaced holes through it

Elan Coil [88]

Solution :

The angular acceleration, $\alpha$ is obtained from the equation of the $\text{Newton's second law}$ of rotational motion,

Thus,

$\tau = F \times d$

or $\tau = I \times \alpha$

where $\tau$ is torque, F is force, d is moment arm distance, I is the moment of inertia

Thus, $\alpha=\frac{(F\times d)}{I}$

Now if the force and the moment arm distance are constant, then the $\text{angular acceleration is inversely proportional to the moment of inertia.}$

That is when, F = d = constant, then $\alpha \propto \frac{1}{I}$ .

Thus, moment of inertia, I is proportional to mass of the bar.

The mass is less for the bar in case (1) in comparison with that with the bar in case (2) due to the holes that is made in the bar.

Therefore, the bar in case (1), has less moment of inertia and a greater angular acceleration.

6 0

3 years ago