Answer:
clockwise torque is due to weight of the person + weight of the ladder
Explanation:
As we know that the forces that act on the ladder is given as
1) friction force
2) Normal force at the ends of the ladder
3) Weight of the person standing on the ladder
4) Weight of the ladder
So here we know that our reference point is at the bottom position of the ladder
So we will have
Torque due to weight of the person and weight of the ladder is counter balanced by the torque due to normal force and torque due to friction force
So here we have
clockwise torque is due to weight of the person + weight of the ladder
Refer to the diagram shown below.
Define
= unit vector in the eastern direction
= unit vector n the northern drection.
Then the displacement vectors are
Vector #1:
Vector #2:
Vector #3:
Because the vector sum of all three vector is zero, therefore
1381.1 +0.6561a - 0.891b = 0
703.7 - 0.9873a + 0.454b = 0
That is,
0.6561a - 0.891b = -1381.1 (1)
-0.9873a + 0.454b = -703.7 (2)
From (1), obtain
b = 0.7364a + 1550.1 (3)
Substitute (3) into (2).
-0.9873a + 0.454(0.7364a + 1550.1) = - 703.7
-0.653a = -1407.4
a = 2155.3 mles
From (3), obtain
b = 3137.2 mles
Answer:
The magnitudes of the two displacement vectors are
2155.3 miles and 3137.2 miles.
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Answer:
The answer is V = 0.9*C
Explanation:
from the relativity formula we have to:
Δt = γ * Δto
Clearing γ:
γ = Δt/Δto
Replacing values:
γ = 2070 s/900 s = 2.3
γ = 1/((1-(V/C)^2)^1/2)
1/((1-(V/C)^2)^1/2) = 2.3
1/(1-(V/C)^2) = 2.3^2
1/(1-(V/C)^2) = 5.29
Clearing V:
V = C * ((1 - (1/5.29))^1/2) = 0.9*C
Answer:
3 Laws of newton -
1. Newton's Law of Inertia
2. Newton's Law of Forces
3. Newton's Law of Action & Reaction
Explanation:
1. Newton's Law of Inertia
An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
2. Newton's Law of Forces
The acceleration of an object depends on the mass of the object and the amount of force applied.
3. Newton's Law of Action & Reaction
Whenever one object exerts a force on another object, the second object exerts an equal and opposite on the first.
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