13. Litmus paper can be used to determine if a solution is an acid or a base. There are two types of litmus paper. Red litmus paper will turn blue in the presence of a base. Blue litmus paper will turn
red in the presence of an acid. Read the descriptions of the following solutions and predict what
the litmus paper results should be. Then conclude as to whether it is an acid, base or neutral
solution. Write your answers below in the table.

Aballet student who learns with the of his instructor is demonstrating learning.

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.)

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec