Hi! I'm a few days late since I just saw this question just now, but I'll answer anyway.
Answer:
When an unbalanced force acts on a moving object, the velocity of the object will change. Change in velocity means a change in speed, direction, or both. For example, if you kick a soccer ball and it moves from one place to another, it means that unbalanced forces are acting upon it. The ball moves from one place to another after kicking it so the position changed.
20 is the atomic number for Calcium.
Answer:
No, the theorem is not violated
Explanation:
No, it is not violated because the work done by gravitational force must also be taken into account. The force to lift the book at constant speed is the same as the gravitational force, i.e. the work done by the gravitational force (weight) is equal in magnitude but negative to the work done by the person to lift the book. (The work done by gravity is negative because displacement and weight have opposite directions).
So if we apply the theorem the work and kinetic energy, we have that the total work done in the book (work of the person plus the gravitational work) is equal to zero, and it is equal to the change of the kinetic energy. The theorem is fulfilled
Answer:
The required angular speed ω of an ultra-centrifuge is:
ω = 18074 rad/sec
Explanation:
Given that:
Radius = r = 1.8 cm
Acceleration due to g = a = 6.0 x 10⁵ g
Sol:
We know that
Angular Acceleration = Angular Radius x Speed²
a = r x ω ²
Putting the values
6 x 10⁵ g = 1.8 cm x ω ²
Converting 1.8 cm to 0.018 m, also g = 9.8 ms⁻²
6 x 10⁵ x 9.8 = 0.018 x ω ²
ω ² = (6 x 10⁵ x 9.8) / 0.018
ω ² = 5880000 / 0.018
ω ² = 326666667
ω = 18074 rad/sec
Answer:
Coefficients are 1/2, -z and +1
Explanation:
The step by step explanation is in the attachment given below.
