Answer:
The correct answer is C , because it increases and decreases
Explanation:
Answer:
a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Explanation:
Answer:
the answer is B
Explanation:
we assume that all of these springs have tha same k , the spring constant
elastic energy for the initial system = Ep1= ![\frac{kd^{2} }{2}](https://tex.z-dn.net/?f=%5Cfrac%7Bkd%5E%7B2%7D%20%7D%7B2%7D)
for the new changed system , the spring constant = k1+k2 = k+k = 2k , but the displacement is also reduced to 0.5 d
so Ep2 =
so the new total Ep stored in the new system is 1/2Ep
hope it helps
Time= 20 minutes= 20*60=1200 s
Charge=current*time=12*1200=14400 C
Answer:
Explanation:
Initially , crate is going upwards with uniform velocity so net force on crate is zero.
Tension T = mg ( its weight )
= 14.5 x 9.8
= 142.1 N
Now tension is increased to 180 N , so net force on it
= 180 - 142.1 = 37.9 N
Work done by tension that is 180 N
= Tension x displacement
= 180 x 1.15 x 10⁻³
= .207 J