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A lens with focal length 50 mm and a maximum aperture f/2 forms an image of an object 9.0 m away. A. What is the numerical aperture of the lens?
A current-carrying wire is in a mangentic feild with the directon of the current parallel to that of the field.
Over how many pixels will a green (500 nm) quantum dot appear on the camera? If we want the image of a quantum dot to take up about 3x3 pixels, we can build an optical system to magnify the image. W
A) Astronomers on planet Zog whose sun is 1.4 x 10^11 m away, measure their solar flux to be 1250 W/m^2. What is their sun's total energy output?
If we want the image of a quantum dot to take up about 3x3 pixels, we can build an optical system to magnify the image. What magnification should it have?
If the total electric current reaching the Earth's surface is nearly constatnt at 1000 A, approximately how much electrical energy is dissipated each second by the atmosphere?
Microtubules are protein filaments that are only 25 nm in diameter. This is smaller than the diffraction limit for visible light. Assume that you have microtubules labeled with rhodamine 6B dye. (A
The electrical potential of the ground was measured at the top off a hill. If the height of the hill is 20 meters above the level of the surrounding plain, what will be the measured voltage?
Transverse waves with a speed of 52.0 m/s are to be produced on a stretched string. A 5.40-m length of string with a total mass of 0.0600 kg is used. (a) What is the required tension in the string?
Determine the distance along the floor from the point of initial impact where the ball will no longer bounce above a height of 10 cm on the earth and on the moon.
An object of mass 1.60 kg is oscillating freely on a vertical spring with a period of 0.710 s. Another object of unknown mass on the same spring oscillates with a period of 1.26 s.
A harmonic wave is traveling along a rope. It is observed that the oscillator that generates the wave completes 43.0 vibrations in 25.0 s. Also, a given maximum travels 422 cm along the rope in 8.0
The student of mass 70 kg walks slowly toward the center of the platform. If angular velocity of the system is 2 rad/s initially, what is the angular velocity of the system when the student is 0.5m
A small solid disk of mass m and radius r rolls without slipping down a ramp. If it starts from rest at the top of the ramp, what is the minimum value of h, in terms of R, such that the disk comple
(a) How much voltage is induced in the loop? (b) If B is pointing out of the paper toward you, which way does the induced current flow?
Is this the same as the air at 1000mb on the windward side of the mountains having a temperature of 294.5K and a mixing ratio of 10g/kg or is it the same as the air at 800mb with a temperature of 27
Assume the ladder is uniform and has a mass of 15.2 kg while the person has a mass of 76.5 kg. Set up the equation of equilibrium. Simplify them but do not solve them
If the wet-bulb temperature of a parcel at 1000mb is 288K and its mixing ratio is 6g/kg. Find the relative humidity of the parcel after it is lifted dry adiabatically to 900mb. Assume lv (latent hea
If the temperature inside a room is 298K and the temperature outside is 263K, calculate the maximum value of r (relative humidity) that can be accommodated inside the room without the windows foggin
Calculate the moment of inertia of the system (disk and blocks). Show your work.
In terms of I0 at the peak of the central maximum, what is the intensity of the light at the screen at the distance from the center of the central maximum? Express your answer in terms of I0.
A 50 W light bulb shines through two polarizers. After having passed through the first polarizer, the electric field incident on the second polarizer is 5.0 V/m. The second polarizer sits at a 50&de
During the first 18 minutes of a 1 hour trip, a car has an average speed of 11 m/s. What must the average speed of the car be during the last 42 minutes of the trip to be if the car is to have an a
A 120 V rms voltage at at 100 Hz is applied to a 200 mH inductor, a 4 uF capactiro and a ressistor. If the rms value of the current in the circuit is 0.4 A, what is the value of the resistor?