As a truck rounds a curve, a box in the bed of the truck slides to the side farthest from the center of the curve. this movement of the box is a result gravity inertia centripetal forcecentrifugal force.

Answer : The movement of the box is a result of the centrifugal force.

Explanation :

As a truck rounds a curve, a box in the bed of the truck slides to the side farthest from the center of the curve. This movement of the box is a result of centrifugal force.

It is a pseudo force that acts on an object when viewed from the rotating frame of reference. It acts radially outwards.

So, the correct option is (d) " centrifugal force ".

inertia

Explanation:

A body is has a property - inertia due to its mass. A body resists any change in its state of rest or motion due to inertia. This is also the Newton's first law of motion.

When a box is kept in a moving truck, it gains the speed of the truck once in motion. When the moves round in a curve, the box due to inertia keeps moving straight and resists change in its motion due to inertia and slides to the side in the opposite direction of the motion of the truck.

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.