Answer:
D Any of the above depending on the directions of forces.
Explanation:
The net force on the box depends on the direction of the forces.
For example, we have three special cases:
- If the two forces are in the same direction, they add to each other, so the net force is
F = 10 N + 10 N = 20 N
- If the two forces are in opposite directions, the net force is given by the difference between the two forces, so
F = 10 N - 10 N = 0 N
- If the two forces are perpendicular to each other, their resultant is given by the Pythagorean theorem:
![F=\sqrt{(10 N)^2 + (10 N)^2}=14.1 N](https://tex.z-dn.net/?f=F%3D%5Csqrt%7B%2810%20N%29%5E2%20%2B%20%2810%20N%29%5E2%7D%3D14.1%20N)
If the two forces are at any other angle, their resultant can be found by resolving each force along the x- and y- direction, and adding the components along each direction. The resultant net force will have a magnitude between 0 N and 20 N.
Answer:
Voltage describes the potential difference between the two ends of a conductor and thus , more the voltage , more will be the flow of current through the conductor ( more no of electrons and faster speed).
Explanation:
Answer:
the time required is 0.886 seconds
Explanation:
The computation is shown below:
As we know that the content of the chemical energy that has a calorific value of hydrogen is 141790 kJ /kg
And, the total energy stores is 100,000 kg
Now
E = 141790 × 100,000 kJ
= 14.179 TJ
The time would be
T = E ÷ P
= 14.179 ÷ 16
= 0.886 sec
hence the time required is 0.886 seconds
An element which is highly conductive, highly reactive, soft, and lustrous is most likely an alkali metal.
Alkali metals are in group 1 of the Periodic table which means that they have only a single valence electron.
This causes them to be soft and highly reactive because:
- The single valance electron leads to weak bonds amongst the element's atoms which makes them soft
- The elements want to lose the single valance electron so as to become stable so they will react with other elements to give away the electron.
Examples of alkali electrons include:
- Lithium
- Sodium
- Potassium etc
In conclusion therefore, alkali metals are highly reactive and soft and so the element described above is most likely an alkali metal.
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