Complete question is;
A 50.-ohm resistor, an unknown resistor R, a 120-volt source, and an ammeter are
connected in a complete circuit. The ammeter reads 0.50 ampere.
A) Calculate the equivalent resistance of the circuit shown.
B) Determine the resistance of resistor R shown in the diagram.
Answer:
A) R_eq = 240 Ω
B) R = 190 Ω
Explanation:
A) To get the equivalent resistance, we will use the formula;
R = V/I
Where;
V is Voltage
I is current
R is equivalent resistance
From the question, V = 120 V and I = 0.5A
Thus;
R_eq = 120/0.5
R_eq = 240 Ω
B) From the image, we see that the resistors are connected in series.
Formula for resistors in series is;
R = R1 + R2 +..... Rn
Thus;
240 = 50 + R
R = 240 - 50
R = 190 Ω
They either push or pull and make the object magnetic.
Clear question is;
An ideal gas is enclosed in a piston-cylinder apparatus with the piston being freely movable. Given that ΔE is positive and ΔH is negative following a process,
pick one
A) the system absorbs heat and expands during the process.
B) the system absorbs heat and contracts during the process.
C) the system loses heat and expands during the process.
D) the system loses heat and contracts during the process.
E) the system loses heat but neither expands nor contracts during the process.
Answer:
Option A is correct.
Explanation:
In thermodynamics, when the change in energy which is ΔE of a system is positive, it means that the system is undergoing an endothermic process. An endothermic process is simply one where heat is absorbed from the surroundings
Now, when change in enthalpy which is ΔH is negative, it means that it's an exothermic reaction. Exothermic means it releases heat to the surroundings. This means work is positive because the system does work on the surroundings. Thus it will expand.
So the correct answer is;
heat is absorbed from the surroundings and will expand during the process.
Answer:
1
Explanation:
41° 10' N latitude, 74° W longitude
<span>Frequency of the pendulum F = 0.15Hz
Acceleration due to gravity g = 9.81 m/s^2
Period of the pendulum is calculated by T = 2 x 3.14 x squareroot of (L / g), L being the length of the pendulam.
We have an equation between T and F => T = 1 / F
T = 1 / 0.15 => T = 20 / 3
Now substituting the values
=> 20 / 3 = 2 x 3.14 x squareroot of (L / 9.81)
=> 3.33 = 3.14 x squareroot of (L / 9.81)
=> squareroot of (L / 9.81) = 3.33 / 3.14
=> L / 9.81 = 1.06^2
=> L = 1.13 x 9.81
Length of the pendulum = 11 m</span>