Answer:
the tension in the part of the cord attached to the textbook is 7.4989 N
Explanation:
Given the data in the question;
As illustrated in the image below;
first we determine the value of the acceleration,
along vertical direction; we use the second equation of motion;
y = ut + at²
we substitute;
0 m/s for u, 1.29 m for y, 0.850 s for t,
1.29 = 0×0.850 + ×a×(0.850)²
1.29 = 0.36125a
a = 1.29 / 0.36125
a = 3.5709 m/s²
Now when the text book is moving with acceleration , the dynamic equation will be;
T₁ = m₁a
where m₁ is the mass of the text book ( 2.10 kg )
a is the vertical acceleration ( 3.5709 m/s² )
so we substitute
T₁ = 2.10 × 3.5709
T₁ = 7.4989 N
Therefore, the tension in the part of the cord attached to the textbook is 7.4989 N
Answer:
maybe make your own lock on the door:) that's what I did when I lived in a place with nosy roomates
The temporarily be the output of a 100-W light bulb is 148 watt.
To find the answer, we need to know about the resistance of the bulb.
<h3>What's the mathematical expression of resistance of the bulb in term of power and voltage?</h3>
- Mathematically, power= voltage²/resistance
- So, resistance= voltage²/power
<h3>What's the resistance of the bulb, if 115 volt is applied to 100 watt bulb?</h3>
Resistance= 115²/100= 132.25 Ohm
<h3>What's the power of the bulb, if 140 volt is applied to it?</h3>
Power= voltage²/resistance
= 140²/132.25
= 148watt
Thus, we can conclude that the temporary output of the bulb is 148 watt.
Learn more about the electric power here:
brainly.com/question/13080026
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Answer:
-1.5
Explanation:
a=vf-vi/t
the. otion come to rest so thr vf is zero