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oksian1 [2.3K]
3 years ago
6

If a body starts moving from rest itsinitial velocity isų Vzerom/s​

Physics
1 answer:
Artist 52 [7]3 years ago
6 0

Answer:

zero

When a Body start a from rest ,its initial velocity is zero.

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A fireman of 80 kg slides down a pole.When he reaches the bottom, 4.2 m below his starting point, his speed is 2.2 m/s . By how
levacccp [35]

Answer:

3099 J

Explanation:

The increase in thermal energy corresponds to the mechanical energy lost in the process.

The mechanical energy is given by the sum of gravitational potential energy and kinetic energy of the fireman:

E=K+U

At the top of the pole, the fireman has no kinetic energy, so all his mechanical energy is just potential energy:

E=U=mgh=(80 kg)(9.8 m/s^2)(4.2 m)=3293 J

When the fireman reaches the bottom, he has no gravitational potential energy, so his mechanical energy is just given by his kinetic energy:

E=K=\frac{1}{2}mv^2=\frac{1}{2}(80 kg)(2.2 m/s)^2=194 J

So, the loss in mechanical energy was

\Delta E=3293 J-194 J=3099 J

and this corresponds to the increase in thermal energy.

7 0
3 years ago
A parallel plate capacitor is charged up by a battery. The battery is then disconnected, but the charge remains on the plates. T
larisa [96]

Answer:

a. Decreases

b. Increases

c. Remains the same

d. Increases

Explanation:

a. Capacitance is given by c= Ak€/d

where A is conductivity plate with Area

K is a constant

€ is dielectric with permittivity.

d is the distance

b. Potential difference is given by

V = Ed, since, the electric field remains the

same, the potential diterence also increases with increase in distance.

Since the capacitance depends upon the distance, and all the other factors are kept constant, the capacitance decreases.

c. Electric field remains the same because charge on the

plate remains the same.

d. since electric field remains the same and capacitance decreases, the energy increases.

E= 1/2c * Q^2

7 0
3 years ago
A diver leaps from the edge of a diving platform
Pepsi [2]
Please reply to this with your question I would like to help.
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3 years ago
Forces cause changes to the motion of objects. Name a force and describe two changes it makes.
otez555 [7]
Sliding and Static.

Would be the right one here.
3 0
3 years ago
According to Bohr's model of the hydrogen atom, the atomic orbit with a quantum number of n = 1 has
8_murik_8 [283]
The answer will be b but check it by yourself we are humans
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3 years ago
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