Podcast
Questions and Answers
What is the direction of the magnetic field surrounding a long, straight wire carrying a current?
What is the direction of the magnetic field surrounding a long, straight wire carrying a current?
What is the net force acting on an aeroplane that enters a horizontal turn by banking to the right with a constant speed?
What is the net force acting on an aeroplane that enters a horizontal turn by banking to the right with a constant speed?
What is the physical quantity that is maximum when Δr⃗ ≠ 0⃗⃗?
What is the physical quantity that is maximum when Δr⃗ ≠ 0⃗⃗?
What is the condition for the loop law ∑ℰ + ∑V = 0 to be applicable?
What is the condition for the loop law ∑ℰ + ∑V = 0 to be applicable?
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What is the relationship between the work done on a particle and the force acting on it?
What is the relationship between the work done on a particle and the force acting on it?
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What is the value of the unknown mass m that balances the scales in John's experiment?
What is the value of the unknown mass m that balances the scales in John's experiment?
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Study Notes
Electricity and Motion
- The SI derived unit of voltage is the volt (V).
- The kinematic formula Δ𝜗 = 𝜔𝑖Δ𝑡 + 𝛼 ⁽²⁾(Δ𝑡)² is valid for certain types of motion.
- A magnetic field surrounds a long, straight wire carrying a current, and the field's direction is perpendicular to the wire.
- The electric force between two oppositely charged particles is attractive.
Balancing Forces
- When a 1.00-kg mass is hung from a set of balance scales, an unknown mass m balances the scales when placed 0.30 m from the pivot point.
- The value of m can be calculated using torque and rotational equilibrium.
Motion with Constant Velocity
- An aeroplane in a horizontal turn with a constant speed has a net force acting on it, which is not zero.
- The work done on a particle by a force F ≠ 0 as it moves through a displacement Δr is maximum when Δr is in the direction of F.
Electric Circuits
- The loop law ∑ℰ + ∑V = 0 is a consequence of applying the law of conservation of energy to the flow of current around a closed loop.
- In a series circuit with resistances of 2.0 Ω, 4.0 Ω, and 6.0 Ω and a 24-V battery, the current in the 4.0 Ω resistor can be calculated using Ohm's law and Kirchhoff's laws.
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Description
A collection of problems related to physics, covering topics such as voltage, kinematics, magnetism, and electric forces.
