7(b) [10 points] Consider the curve given by the polar equation

Which of the following series converges? I.

Block A and Block B collide on a frictionless surface. Block B is initially at rest. What is the final velocity of Block A?

The diagram shows a uniform hinged bar supported by a horizontal string attached 1/4 of its length from the far end. Which of the following expressions would be appropriate for calculating the tension in the string?

You are pulling a sled along the ground with the magnitude of force shown. The rope forms a 45° angle with the ground. If the sled is moving at a constant speed, what is the coefficient of kinetic friction between the sled and the ground (

Five forces of equal magnitude are being applied to a square shape as shown below. Which force exerts the largest magnitude of torque about the point marked with the X? (All marked angles are 45

Three blocks with identical masses are set on three planes inclined at the same angle as shown.  The coefficients of kinetic friction between the blocks and the plane is

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If you dissolve 45.0 g of MgCl2 (95.21 g/mol) in enough water to make a 3-L solution, what is the concentration (in molarity) of this magnesium chloride solution?  

How many lithium atoms are in 8.21 g of lithium? (use scientific notation and report answer to three significant digits). Li atoms = [a]x10^[b]