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The position of an alien spacecraft is given by r = o.78t^3i - 1.7t^2j + 0.39k m. The mass of the spacecraft is 2.45 x 10^6 kg. Find the net force on the spacecraft at t = 8 s.
The power radiated by an object is 145 W. If the object were a perfect blackbody radiator (and otherwise was the same) it would radiate 587 W. What is the emissivity of the object
a quasars spectrum shows a shift in spectral lines of 0.158. Use the doppler-shift formula to determine what recession velocity this shift indicates, calculate the recession velocity in kms per second
A positive charge of Q = 4.60 uC is fixed in place. From a distance of ri = 4.60 cm a particle of mass m = 5.70 g, What is the minumum distance rf between the two charges
q1. a ball in flight is recorded and analyzed using digital video analysis software. the analysis produced the result
A village maintains a large tank with an open top, containing water for emergencies. The water can drain from the tank through a hose of diameter 6.70 cm. find the friction force exerted by the nozzle on the stopper
Most of the blackholes observed by astronomers have masses equal to a few solar masses (the result of the death of a high mass star) or have masses equal to several million solar masses
Disk 1 has a radius of 5 cm and mass of 1 kg it spins at an angular velocity of 2 rad/s a second disk is dropped on top of disk 1. what was the mass of the second disk
Consider two simple pendulums p and q of equal length l and mass m1 and m2 respectively. assume the bobs of the pendulum are connected to each other by a weightless spring of force constant k such that in the equilibrium position,the spring is uns..
A mass-spring system is in simple harmonic motion. It has a spatial frequency F and amplitude A. what fraction of the system energy is kinetic
One fragment, whose speed immediately after the explosion is zero, falls vertically. Illustrate what is the horizontal speed of the other fragment?
A flask is filled with 1.50 L (L = liter) of a liquid at 98.0 °C. What is the coefficient of volume expansion of the liquid
The entrance to a large lecture room consists of two side-by-side doors, one hinged on the left and the other hinged on the right. What is the diffraction angle of the sound under each of the following situations
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