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A gas of hydrogen-like ions is prepared in a particular excited state A. It emits photons having wavelength equal to the wavelength of the first line of the Lyman series together with photons of five other wavelengths. Identify the gas and find the principal quantum number of the state A
A typical nuclear reactor generates 1000 MW of electrical energy. In doing so, it produces "waste heat" at a rate of 2000 MW and this heat must be removed from the reactor. How many kilograms of cooling water have to be pumped through the reactor e..
You walk at an angle of θ=50.0* toward a planemirror. Your walking velocity has a magnitude of 0.90m/s. What is the velocity of your image relative to you(magnitude and direction)? What equation should I use to figure this problem out?
2 kg block slides on a rough horizontal surface. the block hits a spring with a speed of 2.4 m/s and compresses it a distance of 11 cm before coming to rest. what is the force constant of the spring
An electric motor with a 4.7-hp output drives a machine with an efficiency of 30%. What is the energy output of the machine
a 7 ohm resistor is mounted in parallel with a resistor r5 ohms and this combination is connected in series with an 8
A frog in a hemispherical pod finds that he just floatswithout sinking in a fluid of density 1.25 g/cm3. what is the mass of the frog
two electric charges q1 18.8 nc and q2 10.8 nc are located on the x-axis at x 0 m and x 1.00 m respectively. what
A 7.50 kg box is pushed across a floor by a constant force applied force at 25 degrees. the box starts from rest and moves at 1.20 m/s after the box is moved 5.00 meters. The coefficient of friction is .320 What is the magnitude of the force applied ..
A prism whose cross section is shaped like an isosceles right triangle is made from a material with index of refraction, n =1.33. Discover the angle θ of the entering/exiting rays that travel parallel to the lower side (in degrees).
suppose you adjust your garden hose nozzle for a hard stream of water. you point the nozzle vertically upward at a
Consider a bird that flies at an average speed of 10.7m/s and releases energy from its body fat reserves at an average rate of 3.70W, How far will the bird fly before feeding again
What is the ratio of the cardinal's magnitude pc of momentum to the magnitude pb of the baseball's momentum?
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