Physics

Physics, 10.07.2019 23:40, kaadenday3629

The position vcctor r of a point p at time t satisfies the equation dr w x r, where is a constant non-zero vcctor. show that r is constant and that plies n a fixed plane deduce tht p describes a circle with constant speed 10.

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Physics, 10.07.2019 21:40, loveagirl111puppy

A2kg mass is suspended vertically from a spring attached to a fixed support. the spring satisfies hooke's law with a spring constant of k 18 n m1. no damping is present. gravity acts on the mass with a gravitational constant of g 10 m s2. an external force of r 24 sin (wt) newton is applied to the mass, directed downwards, where t is the time in seconds since the mass was set in motion and w is a positive real constant the mass is initially set in motion from its equilibrium position with a velocity of 4 m s1 downwards let y(t) be the displacement in metres of the mass below its equilibrium position at time t seconds (a) use newton's second law to show that the displacement y(t) satisfies the following equation of motion "(t)9y(t) 12 sin(wt) (b) for the case of w 3, solve the equation of motion to find y(t) (c) describe the long-term behaviour of the solution y(t) predicted by this model when w 3. explain whether this behaviour is realistic (d) describe the long-term behaviour of the solution y(t) predicted by the model when w = 2. explain your answer but do not solve for y(t) in this case.

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Physics, 13.07.2019 19:10, ruslffdr

Planck's formula for the "spectral density" ρ, that is, the energy per unit volume per unit frequency v, of blackbody radiation at absolute temperature t, is given by 8thu3 1 c3 eh/(kt)-1 where k is boltzmann's constant and h is planck's constant. show that the frequency vmaz at which the spectral density is maximum satisfies hwmez/(kt) constant, (kt) - as a function of t, where the constant is just less than 3 (hint: consider drawing a graph of of two curves to see the intersection point). can you determine the dimensionless constant more accurately?

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Physics, 14.09.2019 11:30, farh

A0.5-kg mass is attached to a spring with spring constant 2.5 n/m. the spring experiences friction, which acts as a force opposite and proportional to the velocity, with magnitude 2 n for every m/s of velocity. the spring is stretched 1 meter and then released. (a) find a formula for the position of the mass as a function of time. (b) how much time does it take the mass to complete one oscillation (to pass the equilibrium point, bounce back, and return travelling in the same direction)? (c) by what fraction has the amplitude of the motion decreased in this time? (d) do the answers to (b) and (c) depend on the initial position of the mass? why or why not? (e) by immersing the spring in one of a variety of rare, delicious syrups, it’s possible to increase the damping constant while keeping the spring constant the same. can you increase the damping constant so that the spring doesn’t oscillate at all, but just returns to its starting point? what’s the smallest value of the damping constant that will do this?

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The position vcctor r of a point p at time t satisfies the equation dr w x r, where is a constant no...

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