Any vector can be written as components along positive X and positive Y axes.
So vector A can be written as , where is the angle between vector A and positive X axis
So vector A =
So components of vector B along X -axis =5 cm
along Y-axis = 8.667 cm
Answer:
Explanation:
In first case we are interested in one time 6 in six rolls
Thus probability = number of chances required/Total chances
= 1/6
Similarly in the second case probability = 2/12 = 1/6
In the same way in last case probability = 100/600 = 1/6
The probability is the same . Thus all the cases has equal chances
We can solve the problem by using the law of conservation of energy.
Initially, the rock has only gravitational potential energy, which is given by
where mg is the weigth of the rock (2200 N), while h is the height at which the rock has been released (h=15 m). If we calculate it, we get
Just before hitting the ground, the rock height is zero, so its potential energy is now zero. So the total mechanical energy of the rock now is just kinetic energy:
however, the mechanical energy of the rock must be conserved, so
and so we have that the kinetic energy of the rock just before hitting the ground is equal to its initial potential energy:
First, it is necessary to calculate the energy consumed by the bulb during the weekend:
(It is important to express time in seconds).
The energy associated with water is gravitational potential energy and we can write this type of energy depending on volume of water:
Clearing volume in the previous equation: