In which situation is the object experiencing unbalanced forces?
question 1 options:

a. a box resting on a horizontal floor

b. a car slowing as it reaches a stop light

c. a car with its cruise control set to 50 mph

d. a rocket sitting on the launch pad

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

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.)

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3