A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground
The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?
220 N
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Which of the following phenomena is not thought to be a result of collisions or other interactions between galaxies?
A) the presence of large, central dominant galaxies in clusters of galaxies B) the fact that elliptical galaxies are more common in clusters of galaxies than outside clusters C) starbursts D) the fact that spiral galaxies have both disk and halo components
Which of the following statements about the disk of the Milky Way is false?
A) The average age of disk stars is less than that of halo stars. B) Disk stars are all younger than 5 billion years. C) Disk stars have a higher proportion of heavy elements, on average, than halo stars. D) Disk stars orbit in the same direction around the Galactic center. E) The length of the disk is about 100 times its thickness.
When atoms of an element are heated enough that they lose electrons, their emission and absorption spectra change
Indicate whether the statement is true or false
Find the magnetic force when a charge 3.5C with flux density of 4 units is having a velocity of 2m/s.
a). 14. b). 28. c). 7. d). 32.