5. Practice: Each mass is pulling the rope in the opposite direction with a force equal to its weight. Therefore, the net force is equal to the weight difference between mass A and mass B. For each combination of masses, calculate the total mass, net force, and acceleration. Next, measure the final velocity, time, and acceleration for each combination using the Gizmo. Include all units. Mass A Mass B Total mass Net force Calculated Final acceleration velocity Time Measured acceleration 1.0 kg 2.5 kg 4.0 kg 1.0 kg 3.0 kg 3.5 kg 5.0 kg 5.0 kg
6. Analyze: How well did your calculated values for acceleration match up with the measured values ? What are the possible sources of error?

the answer is 3.1 his answer is wrong mines is right

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.

option number c is the right answer.

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm