Physics, 03.07.2019 00:20 erenackermanlevijaeg
Potential energy in common problems: there are certain systems that show up again and again in physics, because they are useful models for other phenomena. it is thus to store key equations for these systems in long-term memory. look up or figure out the formula for the potential energy u of the following systems: (a) an object of mass m located a distance y above the ground (which we will assume to be at zero potential energy, for convenienc. if it , assume that y is much smaller than the radius of the earth. (b) a spring with stiffness k that has been displaced from equilibrium a distance δ . (c) a pendulum consisting of a mass m attached to a string of length l, and the string has been pulled back from equilibrium through an angle θ. assume that the string is hanging straight down and the potential energy is zero when θ 0. i want the exact formula for the potential energy of this system, not the quadratic approximation! (d) a satellite of mass m located a distance r from the center of the earth. (e) two point charges ı and g2 separated by a distance r.
Answers: 1
Physics, 22.06.2019 11:50
Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?
Answers: 2
Physics, 22.06.2019 13:10
The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.
Answers: 3
Physics, 22.06.2019 15:20
A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant
Answers: 3
Potential energy in common problems: there are certain systems that show up again and again in phys...
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