The force that the book exerts on the table is a normal force, not a weight force. (The book's weight doesn't act on the table, it acts on the book.) It's equal in magnitude to the weight of the book, again, because of the first law.

**Answer:**

a)0.5564c

b)43.6 m

**Explanation:**

Given proper length of falcrum L₀= 43.6 m

improper length L=30.1 m (when viewed from moving frame)

we know that

⇒=

v=0.5564c

this is the required speed of falcon when it passes luke

b). Since Han solo is on the Falcon its reference frame will be falcon itself hence there wont be any change in the length of Falcon that its length will be

43.6 m

**Answer:**

<h3>1.03684m</h3>

**Explanation:**

Using the formula for calculating range expressed as;

R = U√2H/g where

R is the distance moves in horizontal direction = 18.4m

H is the height

U is the velocity of the baseball = 40m/s

g is the acceleration due to gravity = 9.8m/s²

**Substitute the given parameters into the formula and calculate H as shown;**

18.4 = 40√2H/9.8

18.4/40 = √2H/9.8

0.46 = √2H/9.8

**square both sides;**

(0.46)² = (√2H/9.8)²

0.2116 = 2H/9.8

2H = 9.8*0.2116

2H = 2.07368

H = 2.07368/2

**H = 1.03684m**

**Hence the ball is 1.03684m below the launch height when it reached home plate.**

**Answer:**

The spectrum will shift to the red.

**Explanation:**

This phenomenon is called as 'Doppler effect'. Doppler effect occurs when a source of waves moves relative to an observer: when this happens, the wavelength of the observed wave appears shifted to the observer.

In this situation, the source of the waves is the star, which emits light (the waves). The observer is on Earth, and the star (the source of the waves) is moving away from the observer: therefore, the wavelength of the light observed by us is shifted with respect to the original wavelength of the light emitted by the star.

In particular, we have two different situations:

- when the star moves away, the wavelength increases, so it shift towards the red (which corresponds to light with longer wavelength) - this effect is called red-shift

- when the star moves towards us, the wavelenght decreases, so it shift towards the blue (which corresponds to light with shorter wavelength) - this effect is called blue-shift

In this situation, the star is moving away from us, so the correct choice is

**The spectrum will shift to the red.**

**Answer:**

4748.4

**Explanation:**

The first number after the decimal is the tenths place and when it says round it means look at the number after it and if it's above four then raise the tenths place by one.