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Two thin lenses with a focal length of magnitude 12.0cm, the first is diverging and the second is converging, are located 9.00cm apart. Can you help me determine if the image is real or virtual
a child is swinging on a swing set. if the chains holding the swing are 5m long, how fast will the child be moving at the lowest point in the swing
calculate the work done by a person pulling a 50kg sled, at constant velocity, along the snow at an angle of 50 degrees from vertical for 5m
Consider an optical gain medium that has two levels at E 1=1.50 eV and E 2=3.50 eV. What is the stimulated emission wavelength
Sirius is about 9.0 light-years from Earth. How far is the trip according to you and How long would the trip take according to an Earth-based observer
Two 0.70g spheres are charged equally and placed 2.4 cm apart. what is the charge on each sphere
You set up an experiment with two polarizer screens on an optical bench and collect data for the intensity of the light at the detector as you vary the relative angle between the transmission axes o
One summer day, you decide to make a popsicle. You place a popsicle stick into a 9-oz glass of orange juice, How long does it take your popsicle to freeze
After a 0.800 nm x-ray photon scatters from a free electron, the electron recoils with a speed equal to 1.32E+6 m/s. Through what angle was the photon scattered
a runner of the 100m dash aims to achieve a 10sec time. he accelerates to his final cruising speed in the first 10m. what is his final cruising speed
suppose a sample of 1 mole of a diatomic ideal gas at 1 atm and 20 degrees C is ADIABATICALLY expanded to 5 times its original volume. how much work did the gas do on the environment
A hoop rolls without slipping down a ramp that is inclined at 35 degrees above the horizontal. Calculate the length of the ramp
A device used in radiation therapy for cancer contains 0.83 g of cobalt-60 (59.933 819 u). The half-life of this isotope is 5.27 yr
Two isotopes of a certain element have binding energies that differ by 4.9060 MeV. Find the difference in atomic mass between the two isotopes
The largest stable nucleus has a nucleon number of 209, and the smallest has a nucleon number of 1. what is the ratio (largest/smallest) of the surface areas of these spheres
A loop of radius R in the x - y plane is centered at the origin and carries a current I. What is the force on the wire
The isotope ^(99)Tc* is commonly used in several different types of medical imaging procedures. find the change in the nuclear mass after emission of the gamma ray
Potassium is an essential element that normally comprises about 0.30% of a person's body mass. 0.12% of potassium is the radioactive K-40, What's the potassium activity in a 73kg person
An aluminum block (c=0.22 kcal/kgoC) of mass 1 kg and temperature 964oC is dropped into 11 liters of water at 26 oC. What is the final temperature of the water and aluminum
Pick what you think are the most reasonable choices for each parameter in the Drake equation and justify your choice. estimate the likely nearest distance to such a civilization
A cylinder which is in a horizontal position contains an unknown noble gas at 5.26 Ã- 104 Pa and is sealed with a massless piston. calculate the change in internal energy of the system
A source in vacuum emits electromagnetic radiation in every direction. Calculate the frequency and wavelength of this wave
The eyepiece of a refracting astronomical telescope (see the figure) has a focal length of 8.75 c. What is the angular magnification of the telescope
A converging lens with a focal length of 6.60cm forms an image of a 3.20mm -tall real object that is to the left of the lens. Where are the object and image located
A small sphere of mass m and radius r slides down a smooth stationary large sphere of radius R under the action of gravity from a position of rest at the top. Find the value of theta at which the pa