The answer is C, because the water molecules are evaporating and the salt molecules are staying the same.
Tectonic plates and convection cells move tectonic plates
Answer:
1.876 J
Explanation:
First, let’s calculate the compression of the spring from the Hooke’s law:
F=kx,
here, F=75 N is the force acted on the spring, k=1500 N⁄m is the force constant of the spring, x is the compression of the spring.
Then, we get:
x=F/k=(75 N)/(1500 N/m)=0.05 m.
Finally, we can find the potential energy stored in the spring:
PE=1/2 kx^2=1/2∙1500 N/m∙(0.05 m)^2=1.875 J.
correct my answer if it's wrong ^^
Answer:
4.09 kgm/s
Explanation:
Concept tested: Second Newton's law of motion
So what does the second Newton's law of motion state?
- According to the second Newton's law of motion, the resultant force and the rate of change of momentum are directly proportional.
- That is;
, where, mVf is the final momentum and mVo is the initial momentum.
In this case;
- Force = 12.8 N
- Initial momentum, mVo = 1.3 kgm/s
- Time, t = 0.218 seconds
Therefore; replacing the values of the variables in the formula;
we get;



Solving for final momentum;

= 4.09 kgm/s
Therefore, the final momentum of the box is 4.09 kgm/s
Answer:
centripetal acceleration = 4.5 m/s^2 ; centripetal force = 247.5 N
Explanation:
centripetal acceleration = v^2 / r = 9^2 / 18 = 4.5 m/s^2
centripetal force = mv^2 / r = 4.5 x 55 = 247.5 N