Weight = (mass) x (local gravity)
8.2 N = (5 kg) x ( g )
Divide each side
by 5 kg : 8.2 N / 5 kg = g
g = (8.5 kg-m/s²) / (5 kg)
= (8.5 / 5) m/s²
= 1.7 m/s² .
The reaction of radiodecay of carbon C-14 is
C-14 --> N-14 + e- + (ve)
where e- is an electron and (ve) is an electron-type antineutrino.
Basically, when the carbon nucleus (atomic number: 6, mass number: 14) decays, a neutron of the nucleus converts into a proton (therefore, the mass number remains the same, 14, but the atomic number increases by 1, therefore it becomes nitrogen) and releases an electron-antineutrino pair.
So, the correct answer is C), N-14.
Explanation:
Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.
Answer:
After 8.5 s
Explanation:
We can use the equivalent suvat equation for rotational motions to find the angular acceleration of the wheel:
where:
is the angular displacement covered during the first 6.0 s (the angle corresponding to one revolution)
is the initial angular velocity
is the angular acceleration
t = 6.0 s is the time
Solving for ,
Now we want to find instead the time t after which the wheel has completed two revolutions, so the time t at which
Using again the same equation as before and solving for t, we find:
Speed of sound in cold air, speed of sound in warm air, speed of sound in steel speed of sound in water, and speed of sound in hot molten lead