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A hydrogen atom in a state having a binding energy (the energy necessary to remove an electron) of 0.378 eV makes a transition to a state by an excitation energy (the difference among the energy of the state and that of the ground state) of 13.056 eV. What is the energy of the photon emitted as a result of the transition?
Two microscopes are placed one on top of the other. They are in contact at one end but a hair separates them at the other end. determine the thickness of the hair?
In Larry Niven's science-fiction novel Ringworld, a rigid ring of material rotates about a star. What is the apparent weight of an inhabitant of Ringworld relative to his weight on Earth
25% of a radioactive material stays active after 4 hours. What is the half-life of this radioactive material
The maximum speed of a 3.7-kg mass attached to a spring is 0.67 m/s , and the maximum force exerted on the mass is 12 N. What is the amplitude of motion for this mass? What is the force constant of the spring?
Heather and Mathew walked eastward with a speed of 9.8 m/s. If it takes those 34 min. to walk to the store, how far have they walked.
A Carnot engine operating with an ideal gas takes heat energy from the hot reservoir at 500 degrees C and exhausts heat energy to the cold reservoir at 250 degrees C. If the engine does 400J of work per cycle, what is its efficiency.
an experiment that can be used to measure velocity of a bullet is to have two cardboard disks attached to a rotating
A box is sliding with a speed of 4.50 m/s on ahorizontal surface when, at point P, it encounters a roughsection. What is the coefficient of friction at the stopping point
During a 65-ms interval, a change in the current in a primary coil occurs. This change leads to the appearance of a 4.3-mA current in a nearby secondary coil. What is the change in the primary current
20.0 kg floodlight in a park is supported at the end of ahorizontal beam of negligible mass that is hinged to a pole. find the horizontal and vertical forces exerted on the beam by the pole
You slide a box of books at constant speed up a 30 degree ramp, applying a force of 160 N directed up the slope. What is the mass of the box
A cylinder, semicircular in cross-section, 10.0 m long and 5.00 m in radius is completely submerged in water. What is the buoyant force on the cylinder
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