The pressure at the top of a liquid is zero. At a depth of 0.589 m, the
fluid pressure is 4910 Pa. What is
the density of the fluid?
(Unit = kg/m^3)
(1 atm = 101300 Pa)

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.)

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little