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The normal human eye has maximum visual acuity with a pupil size of about 3 mm. For larger pupils, acuity decreases due to increasing aberrations; for smaller pupils, acuity decreases due to increas
A loaded penguin sled weighing 90 N rests on a plane inclined at 20° to the horizontal. Between the sled and the plane the coefficient of static friction is 0.29, and the coefficient of kinetic fr
A projectile is at the highest point in its path. Is its acceleration at this instant greater than, less than, or equal to its acceleration just after it was launched? My initial thought is equal to
Calculate the ratio of the drag force on a passenger jet flying with a speed of 1100 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at two-thirds the speed and half
A 11µ F capacitor is joined in series with a 35µ F capacitor and a 12 Volts battery. A) What is the potential difference across the first capacitor?
A stone thrown horizontally from a height of 5.92 m hits the ground at a distance of 13.50 m. Calculate the speed of the stone as it hits the ground. Neglect air resistance.
Light of wavelength 466 nm is incident normally on a film of water 1.0 µm thick. The index of refraction of water is 1.33. (a) What is the wavelength of the light in the water?
A motor is designed to operate on 132 V and draws a current of 9.4 A when it first starts up. At its normal operating speed, the motor draws a current of 3.90 A. (a) What is the resistance of the ar
Force from an auxiliary motor: 9 N, 20 degrees E of N Force due to the wind: Fwind What is the net force (Fnet) acting on the boat? ? N ?degrees N of E What is the force of the wind (Fwind) on the b
In a wire with a 1.09-mm2 cross-sectional area, 5.17 × 1020 electrons flow past any point during 3.73 s. What is the current in the wire? Find the current density.
(a) What equal positive charges (in Coulombs) would have to be placed on two celestial objects with masses 7.18 x 1026 and 9.79 x 1021 kg to neutralize their gravitational attraction? (b) What mass o
An electron in a certain region of space has an electric potential energy given by U(x) = [(7.60*10^-15 J)x + (4.80*10^-16 J/m)x^3] in terms of its position on the x-axis. Determine (a) the electric
A one kilomole of an ideal gas under goes a reversible isothermal expansion from a volume of 5 liters to a volume of 10 liters at a temperature of 20 degrees Celsius What is the change in entropy of
The electric field 4.00cm from a very long charged wire is ( 2300N/C ,toward the wire). What is the charge (in nC) on a 1.0-cm-long segment of the wire?
If the material has free electrons per cubic meter, find the average drift speed under the conditions of part B.
After 7.15 seconds, the car, which is initially at rest, reaches a speed of 2.89 m/s. What is the average current supplied to the car\'s motor.
You are trying to determine the wavelength of a particular line of a sample's emission spectrum using a diffraction grating. Unfortunately, the slit spacing has worn off of the grating and you do no
Assuming that there are no collisions and that the interactions between the particles are negligible, what is the magnitude of the average current in this region.
a) Find the force on the 12cm side of the loop parallel to the x-axis. Assume the +z-direction as positive.
Find the magnitude of the magnetic field needed to suspend the wire against gravity. Express your answer with the appropriate units.
A 21cm long solenoid consists of 5400 turns of wire wound uniformly. What current is needed to produce an 8.0mT magnetic field inside the solenoid? Express your answer to two significant figures and
Two long parallel wires each carry 2.8A in the same direction, with their centers 1.8cm apart. Express your answer to two significant figures and include the appropriate units. a) Find the magnitude
A 15cm diameter circular wire loop carries a current of 2.4A . a) Find the torque on the loop in a 1.4T magnetic field directed perpendicular to the loop.
(a) Is the electric force between A and B attractive, repulsive or zero? (b) What is the magnitude of the electric force between the balls?
Consider a group of 20 molecules with the following speeds: three have speed 1 m/s, four have 6 m/s, five have 9 m/s, and eight have 12 m/s. Determine the rms speed (in m/s) of the molecules in this