Answer:
The time it can operate between chargins in minutes is
Explanation:
Given: , ,
a). The rotational kinetic energy
b). The power average 0.8kW un range time can be find
Solve to t'
Answer:
(A.)Nuclear fission and beta decay (electron emission)
Answer: B
Explanation:
It's not the time it took to heat the substance, so that rules out A and C.
This means that we only have to choose between
B. the area of contact
D. the area of the substances
(since everything else in each of those answers are the same)
Area of contact matters more (e.g. an object with greater surface area is exposed to the air more, will lose/gain heat quicker than an object with less surface area).