Answer:
a). 
b). 
Explanation:
For the block that stays on the track, its maximal height is attained when all of the kinetic energy is converted to potential energy
a).
The height for the block on the longer track can by find using this equation:
Cancel the mass as a factor in each element in the equation
b).
The other lost some kinetic energy so, use a projectile motion to determine the total height for the other bock:
Solve to v'
Answer:
1. Reduce the charge on second object by half or
2. Increase the distance between the two charges by a factor of 1.41 (√2).
Explanation:
Lets assume,
Charge on first object = Q
Charge on second object = q
Distance between them = r
Force between the two charges = F
According to Coulomb's law,
where, k = Coulomb constant
New value of charge on first object = 2Q. Thus the new force(F') will be
So, to bring the value of force(F') to original value, there are two options:
1. Reduce the charge on second object by half or
2. Increase the distance between the two charges by a factor of 1.41 (√2).
Well, I'll try to write the formula in a way that's not confusing,
but I'm afraid it might be slightly confusing anyway.
When you're working with dB, the basic rule is
A change of 10 dB means either multiplying or dividing by 10 .
Multiply something by 10 ==> it increases by 10 dB.
Divide something by 10 ==> it decreases by 10 dB.
It turns out that another way to write all of this is . . .
An increase of 10 dB ===> multiply the original amount by 10¹
An increase of 20 dB ===> multiply the original amount by 10²
An increase of, say, 7 dB ===> multiply the original amount by 10⁰·⁷
A decrease of 10 dB ===> multiply the original amount by 10⁻¹
A decrease of 30 dB ===> multiply the original amount by 10⁻³
A decrease of, say, 13 dB ===> multiply the original amount by 10⁻¹·³
This question says: The sound increases by 5 dB .
That means the original 'intensity' or 'power' of the sound
is multiplied by
10⁰·⁵ = √10 = about 3.162 (rounded) .
From the choices listed, the closest one is (c).
Answer: 75.02 m
Explanation:
u = 0 ( starts from rest )
v = 50 m/s
t = 3 s
( i ) a = v - u / t
= 50 - 0 /3
= 16.67
( ii ) s = ut + 1/2 at²
= 0 × 3 + 1/2 × 16.67 × 3 × 3
= <u>75.02 m</u>
Hope this helps...
Gamma rays because it has more penetrating power and frequency but shorter wavelength.
