Answer:
The positive sign indicates that work is done by the gas.
Explanation:
Let consider that gas inside the cylinder behaves ideally and process is isothermal, so that change in internal energy can be neglected. The engine cylinder is modelled after the First Law of Thermodynamics:
The positive sign indicates that work is done by the gas.
Answer:
If the distance is decreased by 4 times, the force of gravity between the two bodies is one-eighth as weak as before.
Explanation:
The force of gravity between two bodies depends on the mass and distance. But we will focus on distance since that's what the question asks. Therefore, the force of gravity increases as distance between the bodies decreases.
The first question is open series circuit.
The second question is closed series circuit.
Answer:
Explanation:
The bulbs becomes dimmer because effective resistance of the circuit increases since the resistance of the circuit in series connection involves adding the individual resistance compared to in parallel connection where the effective resistance = 1 / R1 + 1/R2 = R1 R2 / ( R2 + R1). The brightness remains the same because the lightbulbs must be of the same resistance. Also using ohm's law
V = IR
I = V / R
I is inversely proportional to the current in the circuit so as R, effective resistance of the circuit increases, I, current decreases and vice versa