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A certain second-order reaction () has a rate constant of 1.10×10-3 at 27 and an initial half-life of 226. What is the concentration of the reactant after one half-life?
A set of crash tests consists of running a test car moving at a speed of 13.0 m/s (28.6 m/h) into a solid wall. Calculate the size of the average force which acts on the dummy during that time
The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250 mW. Find the peak magnetic field strength
What is the thinnest soap film (excluding the case of zero thickness) that appears black when viewed by reflected light with a wavelength of 480 {rm nm}? The index of refraction of the film is 1.33, and there is air on both sides of the film.
A typical digital cell phone emits radio waves with a frequency of 1.9 GHz. how many photons are emitted each second
Two charged bodies exert the force of .145N on each other. If they are moved so that they are one fourth as far apart, what force is exerted.
An alpha particle (the nucleus of a helium atom, with charge +2e and a mass four times that of a proton), What is the speed of the antiproton when the particles are 1.1nm apart
When a test charge q0 = 6 nC is placed at the origin, it experiences a force of 8 ? 10-4 N in the positive y direction. What is the electric field at the origin
Two in-phase loudspeakers are located at (x, y) coordinates (-2.5 m, +2.0 m) and (-2.5 m, -2.0 m), Determine the amplitude of the sound at the five positions on the y-axis (x = 0) with y = 0.0 m, 0.5 m, 1.5 m, and 2.0 m
Two satelities S1 and S2 revolve round a planet in coplanar circular orbits in the same sense. Their periods of revoluions are 1h and 8h respectively. The radius of the orbit of S1 is 10^4km.
A uniform electric field of magnitude 256 V/m is directed in the negative y direction. A +12.9 uC charge moves from the origin to the point (x, y) = (20.0cm, 45.6 cm). What was the change in the potential energy of this charge? Through what potent..
A hawk flies in a horizontal arc of radius 14 m at a constant speed of 5 m/s. (a) Find out its centripetal acceleration. (b) It continues loftly along the same horizontal arc but increases its speed at the rate of 1 m/s2. Find out the acceleration..
Calculate the velocity of a 50.0g steel ball shot from a slingshot with a 120N/m spring constant when pulled back 35cm and released
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