The graph below shows the relationship between speed and time for two objects, a and b. compare with the acceleration of object b, the acceleration of object a is

a. greater
b. the same
c. lesser
d. one-third as less

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

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.)