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In the Bohr model, the electron in H has a circular orbit. For an isolated atom, the only force on the electron is the strictly radial electrical force. Does this violates the uncertainty principle
Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. How much time is required for the projectile to come up to speed
A bird flies 3.05 km due west and then 3.26 km due north. Another bird flies 1.03 km due west and 1.16 km due north. Determine the angle with respect to the 2nd bird's displacement vector
A converging lens with a focal length of 20 cm and a diverging lens with a focal length of -70 cm are 110 cm apart. Calculate the distance between image and diverging lens
A point source of light is submerged 2.2 m below the surface of a lake and emits rays in all directions. What is the maximum radius that this circle could have
A layer of oil (n = 1.45) floats on an unknown liquid. A ray of light originates in the oil and passes into the unknown liquid. What is the index of refraction of the unknown liquid
The refractive indices of materials A and B have a ratio of nA/nB = 1.66. What is the speed of light in material B
A boy throws a rock from the roof of his house at a velocity of 14.5 m/s and an angle of 41 degree. does the rock reach the river
Suppose that a disk rotates through five revolutions in 4 seconds. What is the angular rotational velocity
a typical hard drive in a computer spins at 5400rpm. what is the period in seconds
A flywheel having constant angular acceleration requires 4.30 to rotate through 166. Find the angular acceleration of the flywheel
For an atom (mythical), there are three possible energy levels between which an electron can jump
A pump is used to send oil (density 800 kg/s) through a hose the diameter of which is 5 times that of the nozzle through which the water exits. what is the gauge pressure of the oil in the pump
n unmarked police car traveling a constant 95 km/h is passed by a speeder traveling 130 km/h. how much time passes before the police car overtake the speeder
An ?-particle has a charge of +2e and a mass of 6.64 × 10-27 kg. find the magnitude of the magnetic force on it
In a lightning bolt, a large amount of charge flows during a time of 2.9 x 10-3 s. Assume that the bolt can be represented as a long, How much charged has flowed during the lightning bolt?
The equation of a transverse wave on a string is y = (6.1 mm) sin[(30 m-1)x + (300 s-1)t], What is the wave speed
The function y(x, t) = (25.0 cm) cos(?x - 26?t), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant
Suppose that a simple pendulum consists of a small 61 g bob at the end of a cord of negligible mass. find the pendulums maximum kinetic energy
Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organisms requiresoxygen to survive, it is a necessary component of water systems such as streams, lakes and riv
Distillate (condensate) in four separate containers,~1mL in each, during the fractional distillation of 4mL of a (1:1) cyclohexane-toluene mixture, and then obtain IR spectra for each fraction
Mercury has the density of 13.6 g/cm3. what is the mass of a cylinder of mercury with a tube with an inside diameter of .45 cm and a height of 76.0 cm
(a) What is the rate of the reaction if the concentration of CH3Br is doubled? (b) What is the rate of the reaction if the concentration of NaOH is halved? (c) What is the rate of the reaction if th
At what optimum pH would you recommend to separate cytochrome C; pI 10.6 from a mixture od myoglobin; pI 7.0, ribonuclease; pI 7.8, and leucine; pI 6.0 using a Dowex 50 column? Explain.
a mixture of Phe (pI 5.5), Thr (pI 6.5), Asp (pI 3.0), His (pI 7.6), and Lys (pI 9.8) at pH 9.8 is loaded on an anion-exchange column and then eluted with a pH gradient of lowering pH. what order wi