(1) Suppose you lift a stone that has a mass of 5.3 kilograms off the floor onto a shelf that is 1.5 meters high. How much work have you done

77.91 J

Explanation:

From the question given above, the following data were obtained:

Mass of object (m) = 5.3 kg

Height (h) = 1.5 m

Workdone =?

The Workdone can be obtained by using the following formula:

Workdone = mgh

Where the acceleration due to gravity (g) = 9.8 m/s²

Workdone = 5.3 × 9.8 × 1.5

Workdone = 77.91 J

Therefore, the Workdone in lifting the stone to a shelf that is 1.5 m is 77.91 J

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day