45.65 C
52.79 C
78.11 C
20.05 C
2.A current of 1.90 A flows through a wire. How many electrons pass through that wire in 1 second? The charge of an electron is 1.602 x 10^-19 C (1 point)
2.32 x 10^19 electrons
2.01 x 10^18 electrons
1.04 x 10^20 electrons
1.19 x 10^19 electrons
3.A battery of voltage 9.0 V produces a current of 17.5 mA across a circuit. What is the resistance of the circuit? (1 point)
433 Ohms
514 Ohms
701 Ohms
384 Ohms
4.A battery is marked as having a voltage of 12.0 V and is connected to a circuit that has a resistance of 5.0 Ohms. If the terminal voltage is 8.75 V, what is the internal resistance of the circuit? (1 point)
1.02 Ohms
1.86 Ohms
2.45 Ohms
1.36 Ohms
5.A 12.0 V battery is attached to a circuit with a resistor of 5.5 Ohms. The internal resistance of the circuit is 1.75 Ohms. What is the terminal voltage of the circuit? (1 point)
9.01 V
12.8 V
7.67 V
10.3 V
6.A resistor has a potential difference of 16.5 V across it. It develops thermal energy at 340 W. What is the current across the resistor? (1 point)
15.5 A
23.9 A
31.1 A
20.6 A
7.A 120 V potential difference goes through a light bulb. The wattage of the bulb is 70 W. What is the resistance of the bulb? (1 point)
206 Ohms
114 Ohms
378 Ohms
256 Ohms
8.What is the equivalent resistance in this circuit? (1 point)
26 Ohms
13 Ohms
32 Ohms
18 Ohms
9.What is the equivalent resistance in this circuit? (1 point)
2 Ohms
5 Ohms
1.25 Ohms
3 Ohms
10.A tightly coiled spring has 70 coils, each coil has a diameter of 2.5 cm. The coil is made of conducting cylindrical wire that has a diameter of 3.0 mm. If an ohmmeter records the resistance across this wire as 2.70 Ohms, what is the resistivity of the wire? (1 point)
0.120
0.036
0.089
0.051
Answer:
1. 45.65
2. 1.19x10^19
3. 514OHM
4. 2.45 ( NOT 1.86 OR 1.36)
6. 20.06A
7. 206 ohms
8. 13 Ohms
9. 2 ohms
10. 0.051 ( NOT 0.036 OR 0.089)
Explanation:
I've struggled with both problems 4 and 10
Answer: did you get the answers?
Explanation:
Answer:
5.87 m, 75.5°
Explanation:
Let's say C is the resultant vector.
The x component is the sum of the x components of A and B.
Cx = Ax + Bx
Cx = 10.1 cos 60° + 7.3 cos 275°
Cx = 5.69
The y component is the sum of the y components of A and B.
Cy = Ay + By
Cy = 10.1 sin 60° + 7.3 sin 275°
Cy = 1.47
The magnitude is found with Pythagorean theorem, and the angle is found with trigonometry.
C² = Cx² + Cy²
C² = 5.69² + 1.47²
C = 5.87
θ = atan(Cy / Cx)
θ = atan(5.69 / 1.47)
θ = 75.5°
t or f
Answer:
the mechanical energy of an object can be the result of its motion (i.e., kinetic energy) and/or the result of its stored energy of position (i.e., potential energy). The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy.
Answer:
t
Explanation:
Answer:
Approximately .
Explanation:
Consider one of the equations for constant acceleration ("SUVAT" equations)
,
where
Note that unlike other SUVAT equations, this one does not ask for the time required for the speed of the object to change from to . Since in this problem, time isn't given, this time-less equation would particular useful.
Here
Rearrange the equation to isolate the unknown, :
.
Make sure that all units are standard, so that the unit of the output will also be standard. Apply the equation:
.
Hence the final velocity will be approximately .