<span>The correct answer is D): resistors B and C. In fact, the energy per unit charge is equal to the voltage across the resistors. The electrical potential energy is in fact: </span>
<span>, where q is the charge and V is the voltage; by rearranging the equation, we have </span>
<span>, therefore the voltage is the energy per unit charge. In the circuit in the figure, the resistors B and C are connected to the same points of the circuit (they are connected in parallel), therefore they have the same voltage, so they have the same energy per unit charge.</span>
Answer:
12 kJ
Explanation:
Given:
v₀ = 0 km/h
a = 5 km/h²
t = 30 min = 0.5 h
Find: v
v = at + v₀
v = (5 km/h²) (0.5 h) + 0 km/h
v = 2.5 km/h
v = 2.5 km/h × (1000 m/km) × (1 h / 3600 s)
v = 0.694 m/s
KE = ½ mv²
KE = ½ (50,000 kg) (0.694 m/s)²
KE = 12,000 J
KE = 12 kJ
Answer:
Decrease
Explanation:
Working at a constant temperature when more pressure is exerted, the volume decreases.
This is known as Boyle's law.
According to Boyle's law;
"the volume of a fixed mass of a gas varies inversely as the pressure changes, if the temperature is constant".
Mathematically;
P₁V₁ = P₂V₂
P and V are pressure and volume
1 and 2 are initial and final states.
Answer:
52 meters
Explanation:
The man runs a distance D meters at 4 m/s. The bear runs a distance D+26 meters at 6 m/s.
The time it takes the man to reach the vehicle is:
t = D / 4
The time it takes the bear to reach the vehicle is:
t = (D + 26) / 6
If they reach the vehicle at the same time:
D / 4 = (D + 26) / 6
6D = 4(D + 26)
6D = 4D + 104
2D = 104
D = 52
The man can return safely to his vehicle if D is less than 52 meters.
