Scalars are quantities that are fully described by a magnitude (or numerical value) alone.
Vectors are quantities that are fully described by both a magnitude and a direction.
You need to finish the question
Answer:
a) Qh= 6750 kJ
b) e = 0.296
c)
= 390.625° C
Explanation:
Given:
Work done, W = 2000 kJ
Heat flow, Q = 4750 kJ
Temperature at which heat flows out,
= 275° C
a) Now, the heat flow through the engine (Qh)
Qh = W + Q
or
Qh = 2000 + 4750
or
Qh= 6750 kJ
b) The efficiency (e) is given as:

on substituting the values, we get

or
e = 0.296
c) 
where,
is the temperature at which heat flow
on substituting the values, we get

or
= 390.625° C
A basic circuit must contain an energy source or battery, switch, a path, and a resistor.
That's what I remember when I learned that in middle school.