A child is playing hook-a-duck. The mass of each duck is 50 g. The line has a spring constant of 500 N/m. Calculate the weight of the rubber duck. (Take g = 10 N/kg)
Calculate the extension of the line when a duck is hooked.

Jake has a nine month old son. how can he build his self esteem

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."