Answer:
B.
Explanation:
Oxygen is really -2
While the other options in correct form is
Hydrogen O.S is +1
A pure group 1 element is 0.
And
A monoatomic ion's O.S is the charge contained by it
M = 30 g = 0.03 kg, the mass of the bullet
v = 500 m/s, the velocity of the bullet
By definition, the KE (kinetic energy) of the bullet is
KE = (1/2)*m*v²
= 0.5*(0.03 kg)*(500 m/s)² = 3750 J
Because the bullet comes to rest, the change in mechanical energy is 3750 J.
The work done by the wall to stop the bullet in 12 cm is
W = (1/2)*(F N)*(0.12 m) = 0.06F J
If energy losses in the form of heat or sound waves are ignored, then
W = KE.
That is,
0.06F = 3750
F = 62500 N = 62.5 kN
Answer:
(a) 3750 J
(b) 62.5 kN
<h2>
Answer: True
</h2>
Each atom emits or absors electromagnetic radiation, but only in some frequencies that are characteristic of its chemical element.
Now, if we supply energy in the form of heat (thermal energy) to a certain element in its gas phase, this will be stimulated and its atoms will emit radiation in certain frequencies of the visible spectrum, which constitute its <u>emission spectrum</u>.
If the same element, also in gaseous state, receives electromagnetic radiation, it absorbs in certain frequencies of the visible spectrum, precisely the same ones in which it emits when it is stimulated by heat. This will be its <u>absorption spectrum</u>.
This means that every element absorbs radiation in the same wavelengths in which it emits it.
Answer:
Explanation:
Given
mass of marble 
velocity of marble 
mass of second marble 
Velocity of second marble 
After collision 13.5 gm marble moves to the right at i.e. 
Conserving momentum
