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Fynjy0 [20]
3 years ago
10

Say what main energy change

Physics
1 answer:
Anit [1.1K]3 years ago
8 0

Answer:

b) boy kicking a football

Explanation:

it 's because the ball was at rest but when it was kicked, it starts to more

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Helium atom,  in other words, it consistis of a particle having four protons and two neutrons.
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If an electric wire is allowed to produce a magnetic field no larger than that of the earth (0.50×10−4t) at a distance of 12 cm
Studentka2010 [4]
The magnetic field generated by a wire carrying a current I is:
B(r) =  \frac{\mu_0 I}{2 \pi r}
where r is the distance at which the magnetic field is measured, and \mu_0 = 4 \pi \cdot 10^{-7} NA^{-2} is the magnetic permeability in vacuum.

The problem says that the magnetic field at a distance r=12 cm=0.12 m from the wire must be no larger than B=0.5 \cdot 10^{-4}T. Substituting these values, we can find the maximum value of the current I that the wire can carry:
I= \frac{2 \pi r B}{\mu _0} = \frac{2 \pi (0.12 m)(0.5 \cdot 10^{-4}T)}{ 4 \pi \cdot 10^{-7} NA^{-2}}= 30 A
4 0
3 years ago
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of
algol13

Answer:

0.0768 revolutions per day

Explanation:

R = Radius

\omega = Angular velocity

As the mass is conserved the angular momentum is conserved

I_1\omega_1=I_2\omega_2\\\Rightarrow \frac{I_1}{I_2}=\frac{\omega_2}{\omega_1}

Moment of intertia for solid sphere

I_1=\frac{2}{5}MR^2\\\Rightarrow I_1=0.4MR^2

Moment of intertia for hollow sphere

I_2=\frac{2}{3}M(4.3R)^2\\\Rightarrow I_2=12.327MR^2

Dividing the moment of inertia

\frac{I_1}{I_1}=\frac{0.4MR^2}{12.327MR^2}\\\Rightarrow \frac{I_1}{I_2}=0.032

From the first equation

\omega_2=\omega_1\frac{I_1}{I_2}\\\Rightarrow \omega_2=2.4\times 0.032\\\Rightarrow \omega_2=0.0768\ rev\day

The angular velocity, in revolutions per day, of the expanding supernova shell is 0.0768 revolutions per day

8 0
3 years ago
Scientific experiments must be able to be repeated by multiple scientists to verify the results that are obtained. Which of the
Murrr4er [49]
A. Why do people like to watch TV
7 0
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Bonus Points. A ball was thrown straight up in the air from 1.2 meter above the grouind. After 3 seconds the ball returnes to th
nekit [7.7K]

Answer:

Explanation:

given that

Distance above the ground, s = 1.2 m

Time taken by the ball, t = 3 s

Velocity of the ball, v = 1.2/3 = 0.4 m/s

Maximum height reached by the ball is then given by the formula

H = v² / 2g

H = 0.4² / 2 * 9.8

H = 0.16 / 19.6

H = 0.0082 m or rather, 0.82 cm

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3 years ago
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