When an object is placed between a concave mirror and its focal point, the image is virtual. O True O False

Why do fields store potential energy? an object in the field has charge, fields don’t store potential energy, stationary objects

SpyIntel [72]

Answer:

Hey

Your answer would be:

stationary objects within the field will move when realesed.

The reason why is because fields store potential energy as you know. when something is stationary it has potential, but when it is released that potential energy turns into kinetic energy.

this made me think of a funny joke:

A man was about to jump off of the Empire State Building when a physicist from below yield, Wait don't! you have so much potential!

lol always cracks me up.

6 0

3 years ago

There is a dropping of a coconut of 2kg mass. the speed of the coconut at the moment before it hits the ground is 40m s-1.

igor_vitrenko [27]

Mass=2kg
Velocity=40m/s

We know

$\boxed{\sf K.E=\dfrac{1}{2}mv^2}$

m denotes to mass
v denotes to velocity

$\\ \sf\longmapsto K.E=\dfrac{1}{2}\times 2\times 40^2$

$\\ \sf\longmapsto K.E=40^2$

$\\ \sf\longmapsto K.E=1600J$

6 0

3 years ago

S Two astronauts (Fig. P 11.55 ), each having a mass M , are connected by a rope of length d having negligible mass. They are is

jek_recluse [69]

The new rotational energy of the system(RE) = $mv^{2}$

How this is calculated?

Distance of each astronaut from centre of mass(m)=d/2

Moment of inertia of system

$I=m(\frac{d}{2} )^{2}+ m(\frac{d}{2} )^{2}\\ I =\frac{md^{2} }{2}$

Speed of astronauts=v

So, angular speed,ω = $\frac{v}{d/2}$

= $\frac{2v}{d}$

Rotational energy of system= $\frac{1}{2} I \omega^{2}$

where, ω= angular speed

$RE=\frac{1}{2} *\frac{md^{2} }{2}*(\frac{2v}{d})^{2} \\RE =mv^{2}$

What is rotational energy?

Rotational energy or angular kinetic energy is kinetic energy due to the rotation of an object and is part of its total kinetic energy.
Looking at rotational energy separately around an object's axis of rotation, the following dependence on the object's moment of inertia is observed

To know more about rotational energy , refer:

brainly.com/question/13623190

#SPJ4

7 0

2 years ago

17. The Earth exerts a gravitational force of 0.750 N on an object.

n200080 [17]

Answer:

0.076 kg

Explanation:

The force created by gravity can be found using mass x (9.8 m/s^2).

mg=0.750 N