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steposvetlana [31]
3 years ago
9

Which equation expresses the conservation of mechanical energy in a system that involves kinetic energy, gravitational potential

energy, and elastic potential energy?
Physics
1 answer:
Gwar [14]3 years ago
7 0
1/2mv^2 = mgh. is the equation that expresses the conservation of mechanical energy in a system where the only forms of mechanical energy are kinetic energy, gravitation potential energy and elastic potential energy So the chemical equation for this three energy are 1/2mv^2 = mgh
The answer is 1/2mv^2 = mgh
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An object is placed to the left of a convex mirror, such that the object-to-image distance is 140 cm.
labwork [276]

Answer:

The focal length of the mirror is 52.5 cm.

Explanation:

Given that,

Object to Image distance d = 140 cm

Image distance v= 35 cm

We need to calculate the object distance

u = d-v

u = 140-35=105\ cm

We need to calculate the focal length

Using formula of mirror

\dfrac{1}{f}=\dfrac{1}{u}+\dfrac{1}{v}

Put the value into the formula

\dfrac{1}{f}=\dfrac{1}{-105}+\dfrac{1}{35}

\dfrac{1}{f}=\dfrac{2}{105}

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Hence, The focal length of the mirror is 52.5 cm.

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3 years ago
A disk is free to rotate about an axis perpendicular to the disk through its center. If the disk starts from rest and accelerate
garri49 [273]

Answer:

(C) 16 radians

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\Delta \theta=\omega_i t+\frac{1}{2}\alpha t^2

Here

\Delta \theta Is the angular displacement of the body at the indicated time (t).

\omega_i Is the angular velocity of the body at the initial moment.

\alpha Is the angular acceleration of the body.

The disk starts from rest, so \omega_i=0

Replacing the given values:

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