Earth
A long straight wire carries a current I. What is the Law used to calculate B at a point P located a distance r away from the wire?
Biot-Savart LAw
Why does plastic acquire a negative charge when you rub it with wool?
Plastic has a greater electron affinity
If the current in wires are _____ to the
magnetic field, they feel no force.
parallel
In a series circuit, a 10 Ω resistor and a 5 Ω resistor are connected to a 12 V battery.
15 ohms
Not considering air resistance, how does the x-component of the velocity of a projectile change over time?
It remains the same
In an RC circuit, a capacitor with capacitance C = 10 μF and a resistor with resistance R = 100 Ω are connected in series to a voltage source. What is the time constant of the circuit?
1 milisecond
If the position vs. time graph is concave up, what can you tell about the acceleration?
Acceleration is greater than zero
The tangential acceleration of a simple pendulum is greatest at which of the following times?
A. when the translational kinetic energy is maximized
B. when the rotational kinetic energy is maximized
C. when the speed is maximized
D. when the potential energy is maximized
D
If you are in an elevator and it is going up, do you feel heavier or lighter than if you were stationary?
heavier
If a force is path independent and is zero on a closed path. The force is __________
Conservative.
A parallel plate capacitor is charged by a battery with V volts. After the battery is disconnected and a dielectric slab with dielectric constant K is inserted between its plates, what is the potential across the capacitor?
Imagine a plane on the runway in the +y-direction. If it is slowing down, in what direction is the angular acceleration of its wheels?
the positive x-direction
What is the electric field of a uniform disc of charge?
sigma/(2espsilon0)
By what factor does the period of a pendulum change if the acceleration due to gravity is halved, the mass is quadrupled, and the length of the pendulum is doubled?
It would increase by a factor of two.
When a particle rises to a height h and falls all the way back down, this is the work done by the gravitational force
0 J
Why does a dielectric increase the capacitance of a parallel-plate capacitor?
Because the material will reduce the electric potential between the plates (or E field) compared to open air, increasing the capacitance.
What is the formula for the period of a torsional pendulum?
2 pi sqrt(l/kappa)
Kirchoff’s Junction Rule is based on which conservation law?
Conservation of charge
What kind of materials weakly interact with the external field and temporarily line up some of their domains so that they’re attracted to magnets, but when the field is removed the domains resume their random ordering?
Paramagnetic
If you want to double the momentum of a gas molecule, by what factor must you increase its kinetic energy?
by 4
A solid disk of radius 0.5 m and mass 2 kg rotates with an angular speed of 5 rad/s. What is its rotational kinetic energy?
6.25 J
A 0.1 kg ball traveling at 5 m/s collides with a stationary 0.2 kg ball. If the collision is perfectly elastic, what are the velocities of the two balls after the collision?
2.5 m/s (0.1 kg ball), -2.5 m/s (0.2 kg ball)
3 springs of equal spring constants are joined, two in series joined in parallel to the third. Does the resulting spring have a constant greater, equal, or smaller than the original spring constant?
Greater
A disk is dropped onto a spinning disk with negligible energy being wasted. How does the new angular speed compared to the initial speed?
spinning slower
A circuit with a resistor of resistance R and battery of EMF V dissipates power P. If R is doubled and V is halved, what is the new power dissipated?
P/8