Abaseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. at what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time? a. midway on the way upb. at the top of its pathc. the instant it leaves the catcher's handd. the instant before it arrives in the catcher's mitt

Correct Answer is b. At the Top of its Path

Explanation:

Since, the ball is thrown vertically upwards, the moment ball reaches the maximum height its velocity becomes zero at that instant only.

Also, as the ball is thrown under the action of gravity, its acceleration would remain equal to acceleration due to gravity which is g = 9.8 m/s2. For upward movement g = -9.8 m/s2 and for downward movement g = 9.8 m/s2.

Note:

Velocity is defined as change in speed with respect to time.

Acceleration is defined as change in velocity with respect to time.

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.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.