B. The coefficient of friction between the tires and the road is 0.850 and the mass of the car is 1.35x10' kg. Draw the free body diagram of this situation and determine the applied force
that caused the acceleration from part a. (2 law: Fnet-ma)
Given:
u
בנו
Samt
g=9.8 m/s^2
am
(from part a)
Unknown:
Fapp = ?
Equation:
Fnet=ma
Fapp- umg=ma
Solution:

156.26N

Explanation:

The data needed are incomplete. Let the acceleration of the body be 3.5m/s²

Other given parameters

Mass = 1.35×10^1 = 13.5kg

coefficient of friction between the tires and the road = 0.850

Acceleration due to gravity = 9.8m/s²

According to Newton's second law:

Fnet = ma

Fnet = Fapp - Ff

Fapp is the applied force

Ff is the frictional force = umg

The equation becomes:

Fapp - Ff = ma

Fapp-umg = ma

Fapp - 0.85(13.5)(9.8) = 13.5(3.5)

Fapp - 109.0125 = 47.25

Fapp = 47.25+109.0125

Fapp = 156.2625N

Hence the applied force that caused the acceleration is 156.26N

Note that the acceleration of the car was assumed. Any value of acceleration can be used for the calculation.

B. Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.

Explanation:

Redshift is a phenomenon where electromagnetic radiation from an object undergoes an increase in wavelength such that the light seems to be shifted towards the red part of the spectrum.  Redshifts are used to track the rotation of our galaxy by the astronomers. Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.