Answer:
1.3 g/cm³
Explanation:
The mass of the paint without the tin or lid is:
7 kg − 0.5 kg = 6.5 kg = 6500 g
Density is mass per volume:
d = 6500 g / 5000 cm³
d = 1.3 g/cm³
Answer:
The light radiated from the Sun's surface reaches Earth in about 8 minutes. However, the energy of this light was released by fusion in the Sun's core about several hundred thousand years ago.
Explanation:
Nucleosynthesis is the fusion of lighter elements into heavier elements. For the Sun the main mechanism of fusion is the proton - proton chain, in which two hydrogen atoms fuse into helium, in the course of the fusion photons are created.
When those photons start their travel from the core to the surface of the star, they will interact with different atoms in the whole way (the main free path).
More precisely, when a photon¹ is absorbed by an electron in an atom of a particular element, the electron will get to a higher state. When it comes back to the ground state, a photon will be emitted again.
The process described above is repeating multiple times for every photon until they reach the Sun surface.
The whole process can take about several hundred thousand of years.
Key term:
¹Photon: Particle that constitutes light.
<span>607 m/s
First, let's calculate the mass of a helium atom. You do that by dividing the mass of 1 mole of helium atoms by avogadro's number. So
4 / 6.0221409e23 = 6.6422e-24 g = 6.6422e-27 kg
The equation for kinetic energy is
E = 0.5 M V^2
And we have 1.224e-21 J, which is 1.224e-21 kg*m^2/s^2
So substitute the known values into the equation for kinetic energy and solve for V
1.224e-21 kg*m^2/s^2 = 0.5 6.6422e-27 kg V^2
1.224e-21 kg*m^2/s^2 = 3.32108e-27 kg V^2
368555 m^2/s^2 = V^2
607 m/s = V</span>
Answer:
in projectile motion at maximum height v = 0
we can use the suvat equation to find v(initial)
since in this case v(final) is 0
t = 2.4 seconds
we need to find v(initial) or u
v = u+at
u = v- at
in this case a = g (gravity) = -9.81
u = 0 - (-9.81 * 2.4)
u = 9.81 * 2.4
the negatives become positive sin it’s a double negative ( - - = +)
Answer:
b
Explanation:
It will aplly equal force
