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If a photon moves from n=4 to n=1, what is the energy production? is it gained or lost? what is the wavelength that goes with this energy?
A ball thrown horizontally at 29 m/s travels a horizontal distance of 54 m before hitting the ground. From what height was the ball thrown?
If = 533 , what is the minimum diameter of the circular opening from which the laser beam emerges? The earth-moon distance is 3.84×105.
Estimate the mass of the Martian atmosphere given the following information: the mean radius of Mars is R = 3386 km, the acceleration of gravity is g = 3.71 m/s2, and the atmospheric pressure at th
Explain how this photochemical isomerization allows the production of the thermodynamically less stable cis isomer. in other words, why is the trans isomer exclusivley converted to the cis isomer du
A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 92 m above the glacier at a speed of 165 m/s. How far short of the target should it dr
The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hits the ball with a speed of 28 m/s at an angle of 31° above the horizontal. (a) How long was the ball in flight?
The haloform reaction using I2 and NaOH is referred to as the " iodofom" test for methyl ketones. the test also gives positive results for the compounds containing the -CH(OH)CH3 group.
A 41-kg box is thrown at a speed of 220 m/s and is brought to a halt in a collision that lasts for a time of 6.5 ms. What is the magnitude of the average net force that acts on the box during the co
A sample of water is to be analyzed for solids content. Ten liters (10 L) of water are passed through a filter initially weighing 15 g. After drying at 105oC, the filter plus residual weighs 43 g. T
Vinyl chloride (C2H3Cl) is a confirmed carcinogen that is sometimes found in drinking water and in the air we breathe. If vinyl chloride is present in air at a level of 80 ppb, what is the mass con
Consider the system introduced in example 3.B.2 (p. 97) in which a 2 L sealed jar, half filled with water and half filled with air, contains 10^-3 mol of toluene.
A small map shows New York to be 486 miles in a direction 8° north of east from Columbus. The same map shows that Buffalo is 302 miles in a direction 56° west of north from New York. Assume
Solid chromium (III) hydroxide (Cr(OH)3) is added to pure water so that at equilibrium some solid remains undissolved.
Two strings are vibrating at the same frequency of 150 Hz. After the tension in one of the strings is decreased, an observer hears four beats each second when the strings vibrate together. Find the
What is the masss concentration of water vapor in the atmosphere at 25 degrees celcius when the realtive humidity is 60% and the saturation vapor pressure is 2800Pa?
A ball launched from ground level lands 2.75 s later on a level field 32 m away from the launch point. Find the magnitude of the initial velocity vector and the angle it is above the horizontal. (Ig
Combustion of 6.51 mg of a compound gave 20.47 mg of CO2 and 8.36 mg of H2O. The compound has a molecular weight of 84g/mol. Calculate the percentage composition, empirical formula and molecular fo
What is the final velocity of the dipole? Note: there will be a final x-component of velocity and a final y-component of velocity.
If an electron is traveling at a constant speed and enters the electric field between two charged plates of different voltage, what is the shape of the trajectory it makes while in between the two p
Explain why the standard cell potential for a cell made using Cu/Cu2+ in both half cells is zero. Explain how it is possible to make a cell with Cu/Cu2+ in both half cells with Ecell not equal to z
A parcel of air moving in a straight tube with a constant acceleration of -3.55 m/s2 and has a velocity of 14.5 m/s at 10:05:00 a.m. Describe the shape of a graph of velocity versus time for this parc
How do you calculate the pH and pOH of an aqueous ammonia solution that has an OH - concentration of 1.9 x 10 -3 ? What is the concentration of the Ammonium ion?
An object moves with constant acceleration 3.75 m/s2 and over a time interval reaches a final velocity of 13.6 m/s. (a) If its initial velocity is 6.8 m/s, what is its displacement during the time int
Two 69 g ice cubes are dropped into 234 g of water in a thermally insulated container. If the water is initially at 25°C, and the ice comes directly from a freezer at -15°C, what is the fina