The first one is Force & the second one Power.
Answer:
0.3m
Explanation:
Given parameters;
Elastic energy = 20J
Spring constant = 445N/m
Unknown
Final extension of the spring = ?
Solution:
The elastic potential energy of a stretched spring can be determined using the expression below;
EP =
k e²
k is the spring constant
e is the extension
Insert the parameters and solve;
20 =
x 445 x e²
multiply those sides by 2;
2(20) = 445e²
40 = 445e²
e² =
= 0.09
e = √0.09 = 0.3m
A, B and C are all correct. They can be made from igneous, sedimentary or other metamorphic rock. I hope I’m not too late to answering!
Answer: the washer would slow down depending on how strong the magnet is even though the gravitational pull is the same. the change would be .6
Explanation: i don't really get it
Answer:
The time is 
Explanation:
Given that,
Number of energy level n= 1
Energy E₁=4 eV
We need to calculate the time period
Using formula of time period


Where, E = energy

h = Planck constant
Put the value into the formula



Hence, The time is 