A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object?
A) 9.8 m/s
B) 6.3 m/s
C) 3.6 m/s
D) 7.2 m/s
E) 8.9 m/s
B
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On the average, in a ferromagnetic domain permanent atomic magnetic moments are aligned ____ to one another
a. antiparallel b. parallel c. perpendicular d. alternately parallel and antiparallel e. randomly relative
The graph in the figure shows the electric field strength (not the field lines) as a function of distance from the center for a pair of concentric uniformly charged spheres
Which of the following situations could the graph plausibly represent? (There may be more than one correct choice.) A) a positively charged conducting sphere within another positively charged conducting sphere B) a positively charged conducting sphere within an uncharged conducting sphere C) a solid nonconducting sphere, uniformly charged throughout its volume, inside of a positively charged conducting sphere D) a positively charged nonconducting thin-walled spherical shell inside of a positively charged conducting sphere E) a positively charged nonconducting thin-walled spherical shell inside of another positively charged nonconducting thin-walled spherical shell
The two ends of a 6.60-? resistor are connected to a 14.2-V battery. What is the total power delivered by the battery to the circuit?
a. 0.326 W b. 30.6 W c. 2.15 W d. 619 W
A gasoline engine absorbs 2 500 J of heat and performs 1 000 J of mechanical work in each cycle. The amount of heat expelled in each cycle is
a. 1 000 J b. 1 500 J c. 2 000 J d. 500 J e. 3 000 J