A baseball of mass m = 0.145 kg is suspended vertically from a tree by a string of length L = 1.1 m and negligible mass. Take z
1 answer:
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The force of the air resistance is 4 N.
The given parameters;
- mass of the flower pot, m = 2 kg
- weight of the flower pot, W = 20 N
Let the air resistance = F
Apply Newton's second law of motion to determine the force of the air resistance acting upward to oppose the motion of the pot falling downwards.
Thus, the force of the air resistance is 4 N.
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Answer:
<em>The speed of metal block B is 5 m/s after the collision</em>
Explanation:
<u>Law Of Conservation Of Linear Momentum </u>
The total momentum of a system of bodies is conserved unless an external force is applied to it. The formula for the momentum of a body with mass m and velocity v is
P=mv.
If we have a system of bodies, then the total momentum is the sum of them all
If some collision occurs, the velocities change to v' and the final momentum is:
In a system of two masses, we have:
The metal block A has a mass of m1=3.2 Kg and moves at v1=4 m/s. Metal block b has a mass of m2=1.6 Kg and is initially at rest v2=0.
After the collision occurs, block A moves at v1'=1.5 m/s. We need to calculate the speed of the metal block B. Solving for v2':
Substituting the given values:
The speed of metal block B is 5 m/s after the collision
<h2>Answer:</h2>
4E
<h2>Explanation:</h2>The elastic potential energy of an elastic material (e.g a spring, a wire), is the energy stored when the material is stretched or compressed. It is given by
U = --------------------(i)
Where;
U = potential energy stored
k = spring constant of the material
x = elongation (extension or compression of the material).
<em>From the first statement;</em>
<em>when elongation (x) is 4cm, energy stored (U) is E</em>
<em>Substitute these values into equation (i) as follows;</em>
E =
E = 8k
<em>Make k subject of the formula</em>
k = [measured in J/cm]
<em>From the second statement;</em>
<em>It is stretched by 4cm.</em>
This means that total elongation will be 4cm + 4cm = 8cm.
The potential energy stored will be found by substituting the value of x = 8cm and k = into equation (i) as follows;
U =
U =
U =
Therefore, the potential energy stored will now be 4 times the original one.