Physics, 24.02.2020 11:11 dirgoperadiego2122

1. A boat starts from rest and travels 5250m in 2.20 minutes. It has a mass of 3460 kg. What is the net force exerted? 2. A truck exerts a force of 2400N for 36 seconds and has a mass of 35000 kg. If it starts from rest, what is it’s final velocity?

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Answer from: cain1828

2085.06N

2.47m/s

Explanation:

Question 1

Given parameters:

Mass of boat = 3460kg

Distance traveled by boat = 5250m

Time taken for travel = 2.20minutes.

Unknown:

Net force exerted = ?

Solution:

According to newton's second law of motion "the acceleration of a body is directly proportional to the force on it and inversely proportional to the mass of the body"

a = $\frac{F}{m}$

F is the net force, a is the acceleration and m is the mass

Acceleration is the change in velocity of a body with time;

a = $\frac{V - U}{t}$

V is the final velocity

U is the initial velocity

t is the time taken

since the boat starts from rest, initial velocity = 0

Final velocity;

V = $\frac{displacement}{time}$

Now,

F = ma

In linear motion;

s= ut + $\frac{1}{2}$ a t²

t = 2.2min to seconds = 2.2 x 60 = 132s

s = distance covered

5250 = 0 x 131 + $\frac{1}{2}$ x a x 132²

5250 = 8712a

a = 0.6m/s²

Since F = ma

F = 3460 x 0.6 = 2085.06N

Question 2:

Given parameters:

Force = 2400N

time taken = 36s

Mass = 35000kg

Unknown:

Final velocity = ?

Solution:

According to newton's second law;

F = ma

F is force

m is the mass

a is the acceleration

a = $\frac{V - U}{t}$

V is final velocity

U is initial velocity

t is the time taken

Since U = 0;

a = $\frac{V}{t}$

F = m x $\frac{V}{t}$

2400 = 35000 x $\frac{V}{36}$

V = 2.47m/s

Answer from: Quest

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explanation:

Answer from: Quest

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1. A boat starts from rest and travels 5250m in 2.20 minutes. It has a mass of 3460 kg. What is the...

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