A star both twice the diameter and twice the temperature of our Sun would be ________ times more luminous than our Sun; in fact, Vega fits this description well
Fill in the blank(s) with correct word
64
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Equilibrium: A 40-kg uniform ladder that is 5.0 m long is placed against a smooth wall at a height of h = 4.0 m, as shown in the figure. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction with the ladder is 0.40. An 80-kg bucket is suspended from the top rung of the ladder, just at the wall. What is the magnitude of the force that the ladder exerts on the wall?
A. 740 N B. 1300 N C. 980 N D. 900 N E. 1100 N
If we place living cells in a nonpolar solvent like methane or ethane,
A) their membranes will thicken, preventing molecular transport across the membrane B) they will rapidly explode due to pressure caused by the solvent building up inside the cell C) their membranes will most likely dissolve as cell membranes are also nonpolar D) they will function in much the same way as they do in water
An object that is 3.4 mm tall is placed 25 cm from the vertex of a convex spherical mirror. The radius of curvature of the mirror has magnitude 73 cm
(a) How far is the image from the vertex of the mirror? (b) What is the height of the image?
An ideal solenoid of radius a has n turns per unit length and current I. The magnetic flux ?B through any area completely inside the solenoid, centered on the solenoid axis but at a 45° angle to the axis, so that it touches the inside of the solenoid, as shown below, is
a.
