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Determine the appropriate coefficient of friction in each case. show all you solutions.

1.It takes 59 N of horizontal force to get a 22 kg leather suitcase just starting to move across a floor. find us (hint fn=fg=mg)

2. A horizontal force of 54 N keeps the suitcase in moving at a constant velocity. find uk (hint fn=fg=mg)
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Sally travels by car from one city to another. She drives for 21.0 min at 76.0 km/h, 53.0 min at 40.0 km/h, and 49.0 min at 49.0 km/h, and she spends 6.0 min eating lunch and buying gas. Determine the average speed for the trip.
In Progress...
In Searle’s apparatus for measurement of Young’s modulus, a steel wire of length 2m and
area of cross-section 6 2 2.5 10^-6 m^2 − × is suspended from a torsion head. When a weight of
5 kg is suspended at its free-end, its length increases. Calculate the work done on the
wire. Take Young’s modulus of steel as 2 10^11 Nm .
In Progress...
A Carnot engine has an efficiency of 0.5 while working between a source at 400K and a sink at TK. The temperatures of both the source and the sink are changed. Calculate the efficiencies of the engine when temperatures are (a) increased by 100°C and (b) decreased by 100°C. Interpret your result physically.
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A hill that has a 12.0% grade is one that rises 12.0 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such hill inclined above the horizontal
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A 0.5kg piece of metal (c = 600/kgk) at 300 degreees celsius is dumped into a large pool of water at 20 degree celsius. Assuming the change in temperature of water to be negligible, calculate the overall change in enthropy for the system.
In Progress...
if a charged particle goes unaccelerated in a region containing electric and magnetic field,
a)E must be perpendicular to B
b)velocity must be perpendicular to E
c)velocity must be perpendicular to B
d)E must be equal to vB
explain?
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the net charge in a current carrying wire is zero . then why does a magnetic field exert a force on it
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the free electrons in a conducting wire are in constant thermal motion. if such a wire carrying no current is placed in a magnetic field ,is there any magnetic force on each free electrons ?
In Progress...
If the function psi1 & psi2 are solution of Schrödinger wave equation for a particle , then prove that a1psi1+a2psi2 is also a solution of same equation, where a1 & a2 are arbitrary constants.
In Progress...
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