Answer:
1. Electric current
2. In fact it is electrons that flow through a metallic conductor, and they flow from the negative terminal to the positive terminal
3. Series and parallel
4. Series
5. Parallel
6.
7.
8.A fuse is a small, thin conductor designed to melt and separate into two pieces for the purpose of breaking a circuit in the event of excessive current. A circuit breaker is a specially designed switch that automatically opens to interrupt circuit current in the event of an overcurrent condition.
9.
10. The power of batteries in a circuit. The key functions of a battery and bulb in a circuit are explained. A battery is a source of energy which provides a push - a voltage - of energy to get the current flowing in a circuit. A bulb uses the electrical energy provided by the battery, but does not use current.
Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt), represented by the equation
v = Δs/Δt.
Complete Question
A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650 K and 270 K and performs 4.3 kJ of net work and rejects 8.00 kJ of heat in a single cycle. The thermal efficiency of this heat engine is closest to A) 0.35 B) 0.31. C) 0.28. D) 0.38. E) 0.42.
Answer:
The correct option is A
Explanation:
From the question we are told that
The first operating temperature is
The second operating temperature is
The net workdone is ( output of the engine )
The amount of heat energy rejected is
Generally a heat engine convert heat from a high temperature to mechanical energy and then reject the remaining heat so the absorbed by the engine is
Generally the thermal efficiency is mathematically represented as
Here out is the output of the engine
and in is the input of the engine
=>
=>
D) gas to a solid because the particles are slowing down and there not colliding with each other
<h2>
Rate at which base is decreasing is 3.07 cm /min</h2>
Explanation:
We have area of triangle,
A = 0.5 bh
Where b is base and h is altitude.
Differentiating with respect to time
Here area is 80 square centimeters and altitude is 7.5 centimeters,
So we have
A = 0.5 bh
80 = 0.5 x b x 7.5
b = 21.33 cm
We also have
Substituting in differentiated equation
Rate at which base is decreasing = 3.07 cm /min