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gladu [14]
4 years ago
6

When is a body said to be at res

Physics
1 answer:
Aleksandr [31]4 years ago
7 0
When there is no motion a body is at rest
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A 480N sphere 40.0cm in radius rolls without slipping 1200cm down a ramp that is inclined at 53 0 with the horizontal. What is t
IgorC [24]

As we know that sphere roll without slipping so there is no loss of energy in this case

so here we can say that total energy is conserved

Initial Kinetic energy + initial potential energy = final kinetic energy + final potential energy

\frac{1}{2}mv_i^2 + mgh = \frac{1}{2}mv^2 + \frac{1}{2}I\omega^2+ mgh'

as we know that ball start from rest

v_i = 0

height of the ball initially is given as

h = Lsin\theta

h = 1200sin53 = 960 cm

also we know that

I = \frac{2}{5}mR^2

also for pure rolling

v = r\omega

also we know that

480 = m*9.8

m = 49 kg

now plug in all data in above equation

480*9.60 + 0 = \frac{1}{2}*49*(0.40*\omega)^2 + \frac{1}{2}*\frac{2}{5}*49*(0.40)^2\omega^2 + 0

4608 = 3.92\omega^2 + 1.568\omega^2

\omega^2 = 839.65

\omega = 29 rad/s

So speed at the bottom of the inclined plane will be 29 rad/s

7 0
4 years ago
TRUE OR FALSE : Boyle’s law states that, as the pressure of a gas increases, the volume decreases.
White raven [17]

True, but only if the temperature of the gas doesn't change ...
which is pretty hard to manage when you're compressing it.

I think Boyle's law actually says something like

       (pressure) x (volume) / (temperature)  =  constant.

So you can see that if you want to say anything about two of the
quantities, you always have to stipulate that the statement is true
as long as the third one doesn't change.


6 0
3 years ago
Read 2 more answers
An object is placed at 10.2 cm in front of a diverging lens with a focal length of -10.6 cm. What is the magnification
adoni [48]

Answer:

M= -0.51

Explanation:

After i calculated my v to be -5.2cm from the formula 1/f=1/v+1/u

Then m=v/u which is -0.51

7 0
4 years ago
The most likely theory of the formation of Earth's Moon is that it The most likely theory of the formation of Earth's Moon is th
Ann [662]

Answer:

Option (3)

Explanation:

According to researches done by the astronomers, it has been found that the earth collided with a giant Mars-size early proto-planet, whose name was 'Theia' during the Hadean era, about.5 billion years back. This collision resulted in the detachment of a considerably huge amount of material away from the earth. The remnant debris particles accumulated and gave rise to the formation of moon. The earth during that time was comprised of molten lava only, and from this collision, the earth attained its tilt of approximately 23.5°.

Thus, the correct answer is option (3).

4 0
4 years ago
Which describes an image that can be produced by a concave lens?
mixer [17]
A concave is when the bump is pressed downwards; So if the image has a downward hole, then it's concave. If it's pressed upwards like a hill or mountain, then it's convex.
5 0
4 years ago
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