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A compound microscope has an objective lens with a focal length of 2.0 cm and an eyepiece with a focal length of 5.9 cm. If the image produced by the objective is 18 cm from the objective, what magnification does this microscope produce? (Include the sign.)
Four point charges of magnitude 3.9 µC are at the corners of a square of side 3 m. Find the electrostatic potential energy if all the charges are negative
The period of a pendulum is 0.215 s on Earth. The period of the same pendulum is found to be 0.467 s on planet X, whose mass is equal to that of Earth.
Light impinges on a 1485 line per mm diffraction grating at an angle of incidence of 39.5 degrees. What wavelength, in nm, will be reflected in the first order at an angle of 14 degrees on the other side of the normal to the grating.
Consider the transitions 3d -->2p in hydrogen. Calculate the possible energies of emitted photons, taking into account the spin-orbital interaction. How many photon lines are there? Please show formulas and explain clearly
A spacecraft is in orbit around a planet. The radius of the orbit is 2.9 times the radius of the planet (which is R = 71474 km). What is the period of the spacecraft's orbit
A railroad car of mass 2.3 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, compute the speed of the three coupled cars after the collision
In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots. The horizontal distance between the buildings is 32.0 m, and the heights of the Jackson and Walton ..
A 1.20 kg ball and a 4.00 kg ball are connected by a 74.0 cm long massless, rigid rod. What is the rotational kinetic energy of the structure
It takes sound waves of frequency 500 Hz 14.7 ms to make a round trip through a hollow pipe of length 7.5 m filled with helium. What is the speed of sound in helium
A divers lungs hold 0.0050 m^3 of air at sea level, where the pressure is 101.3 kPa. what is the volume of the air in his lungs at a depth of 3 m
The world's strongest magnet that can produce a sustained field is a 45-T device at the National High Magnetic Field Laboratory in Florida. What's the corresponding magnetic-energy density
question1a small asteroid of mass 2.6e9 kg is revealed travelling at a speed of 18kms on a direct heading for starbase
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