Answer:
A vibration or oscillation is a periodically repeated reversal of the direction of movement.
Explanation:
Une vibration ou une oscillation est une inversion répétée périodiquement de la direction du mouvement.
Here is just another definition.
A vibration is periodic back-and-forth motion centerd around it's equilibrium.
Answer:
At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. ... Since most of the atmosphere's molecules are held close to the earth's surface by the force of gravity, air pressure decreases rapidly at first, then more slowly at higher levels.
Explanation:
Answer:
on an average, <em>2</em><em>0</em><em>H</em><em>z</em><em> </em><em>to</em><em> </em><em>2</em><em>0</em><em>k</em><em>H</em><em>z</em>
1) the weight of an object at Earth's surface is given by

, where m is the mass of the object and

is the gravitational acceleration at Earth's surface. The book in this problem has a mass of m=2.2 kg, therefore its weight is

2) On Mars, the value of the gravitational acceleration is different:

. The formula to calculate the weight of the object on Mars is still the same, but we have to use this value of g instead of the one on Earth:

3) The weight of the textbook on Venus is F=19.6 N. We already know its mass (m=2.2 kg), therefore by re-arranging the usual equation F=mg, we can find the value of the gravitational acceleration g on Venus:

4) The mass of the pair of running shoes is m=0.5 kg. Their weight is F=11.55 N, therefore we can find the value of the gravitational acceleration g on Jupiter by re-arranging the usual equation F=mg:

5) The weight of the pair of shoes of m=0.5 kg on Pluto is F=0.3 N. As in the previous step, we can calculate the strength of the gravity g on Pluto as

<span>6) On Earth, the gravity acceleration is </span>

<span>. The mass of the pair of shoes is m=0.5 kg, therefore their weight on Earth is
</span>

<span>
</span>
Answer:
A) R = 190.42 Ω
B) P = 5.325 W
Explanation:
We are given;
Total power;P_tot = 7.1 W
Voltage;V = 26 V
A)We are told that while the battery is still connected, one of the resistors is heated, so that its resistance doubles.
Thus, the power is doubled.
Now, formula for power is;
P = IV
Thus, since power is doubled, we have;
P = 2(IV)
Now, formula for current is; I = V/R
So, P = 2V²/R
Making R the subject, we have;
R = 2V²/P
In this question, P is p_total = 7.1 W
Thus;
R = (2 × 26²)/7.1
R = 190.42 Ω
B) Now, the resistance of the resistors are R and 2R.
Formula for power in this context is;
P = V²/R
Thus,
Total power delivered to the resistors is;
P = V²/R + V²/2R
P = 3V²/2R
P = (3 × 26²)/(2 × 190.42)
P = 5.325 W