The wedge and screw simple machines
Newton's second law tells you:
Sum of forces on an object = ma
Here, the forces acting on the bundle are the tension in the string and the force of gravity, these two must combine to yield the acceleration of the bundle.
So we have:
T-mg = ma
or T=m(g+a)
We know m=8.7kg, we need to find a from the information
starting from rest, an accelerating object covers distance according to:
<span>dist = 1/2 at^2 </span>
to cover 1m in 1.8s, we have:
a=2d/t^2 = 2x1/1.8^2 = 0.62 m/s/s
Thus, the tension in the string is:
<span>T = m(g+a)
= 8.7</span>kg(9.8m/s/s+0.62m/s/s)
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<span>T = 90.654 N
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Answer:
Explanation:
First of all, we calculate the resistance of the lamp. The power of the lamp is given by
Where
P = 100 W is the power
V = 250 V is the voltage
R' is the resistance of the lamp
Solving for R',
Now this resistance is connected in parallel to the other resistance R, so their equivalent resistance is
(1)
Now the total power in the circuit is
P = 1100 W
And the voltage is
V = 250 V
So we can write
to find the equivalent resistance:
Therefore, rearranging (1), we find R:
Answer:
Is a version of the law of conservation of energy