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ASHA 777 [7]
3 years ago
7

The gravitational self potential energy of a solid ball of mass density ρ and radius R is E. What is the gravitational self pote

ntial energy of a ball of mass density ρ and radius 2R in terms of E?
Physics
1 answer:
Alenkasestr [34]3 years ago
8 0
It will be
E = mgh.
where h and g are constant thus
m can be written as 4/3πr^3*density
E = 4/3πr^3* density
E? = 4/3π(2R)^3* density
= 4/3π8r^3
thus the e will be 4/3π8r^3* density/4/3πr^3*density nd thus you get 8E ..
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A woman steps in front of a child to keep him from running off. which term best describes this example? negative work positive w
lana [24]

Answer:

negative force

Explanation:

Here woman is applying the force to stop the child or to prevent him from running.

Here we know that the force applied by the woman is opposite to the motion of child but here the child is not displaced by this applied force but the child is only prevented his running.

So here the work done by the woman is zero as there is no displacement by this force.

But here we can say that the the force of woman is against the motion of child so here this force is opposite force and hence it is termed as negative force here.

so correct answer will be

negative force

4 0
3 years ago
Read 2 more answers
A diffraction grating is placed 1.00 m from a viewing screen. Light from a hydrogen lamp goes through the grating. A hydrogen sp
Colt1911 [192]

Answer:

λ = 396.7 nm

Explanation:

For this exercise we use the diffraction ratio of a grating

           d sin θ = m λ

in general the networks works in the first order m = 1

we can use trigonometry, remembering that in diffraction experiments the angles are small

           tan θ = y / L

           tan θ = \frac{sin \theta}{cos \theta} = sin θ

           sin θ = y / L

we substitute

          d \  \frac{y}{L} = m λ

with the initial data we look for the distance between the lines

           d = \frac{m \lambda \ L}{y}

           d = 1 656 10⁻⁹ 1.00 / 0.600

            d = 1.09 10⁻⁶ m

for the unknown lamp we look for the wavelength

           λ = d y / L m

           λ = 1.09 10⁻⁶ 0.364 / 1.00 1

           λ = 3.9676 10⁻⁷ m

           λ = 3.967 10⁻⁷ m

         

we reduce nm

           λ = 396.7 nm

8 0
2 years ago
The diagram shows a ramp with a toy car at the bottom. A string attached to the front of the car and the string goes over a pull
Annette [7]

The answer would be Gravity.

Gravity is pulling the weight down, which is pulling the car up the ramp.

3 0
3 years ago
Which statement best describes the type of magnetism generated by attaching a wire to a battery and wrapping the wire around an
Mazyrski [523]
It only occurs when there is an electric current
4 0
3 years ago
Which of the following is the best example of kinetic energy? A. A bowling ball rolling toward the pins B. A horse standing in a
ryzh [129]

The answer is A. Only an object in motion has kinetic energy.

8 0
3 years ago
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