A kitchen drain is blocked with grease. Using your knowledge of chemical reactions and transfer of energy, how can you unplug this drain without physically touching the blockage?
A. Use a drain cleaner that absorbs energy.
B. Use a drain cleaner that releases energy.
OC. Use a drain cleaner that slows kinetic energy.
OD. Use a drain cleaner that increases potential energy.
O E. Use a drain cleaner that stores potential energy.

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° 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.)

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?