The answer is earth's crust
Answer:
C)Before leaving for their trip, turn the central heating system off, along with lights and electrical household appliances.
Explanation:
Although, the other three options will also reduce their electricity bill but they do not explain why Mr. Hernandez's family got same electricity bill as last year even though this time they were not home for one and a half week. Also, A), B) and D) ideas are not reasonable.
So, the only conclusion is that even when they were on a vacation. the electrical appliances in their home were on. That's why the bill remained the same.
The idea of turning the central heating system off, along with lights and electrical household appliances before they leave for the trip will help reduce the energy usage. Also, it is reasonable.
B.the rubber band will return to its original shape the t shirt wont.
Given,
Displacement of the car = 150 km
Velocity of the car = 15.0 km/h
We need to calculate the travel time t
We all know that the formula to calculate velocity is
Velocity = displacement / time
From the above equation,
Time = Displacement / Velocity
Substituting the values in the above equation,
Time = 150 / 15.0 = 10 hours
Therefore, travel time = 10 hours.
