Answer:
a = 50 [m/s²]
Explanation:
This type of problem can be solved using Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = force =25 [N] (units of Newtons)
m = mass = 0.5 [kg]
a = acceleration [m/s²]
The force of gravity is the
force with which massively large objects such as the earth attracts another
object towards itself. All objects of the earth exert a gravity that is
directed towards the center of the earth. Therefore, the force of gravity of
the earth is equal to the mass of the object times acceleration due to gravity and also equal to the weight of the object.
F = ma
since F = W
W = ma
I believe the answer would be A. because a magnet has both a south and a north pole, and electrical charges are formed by positive and negative forces. Hope I helped!
Answer:
Explanation:
Let's start by calculating the angular velocity of the Moon. We know that the period is:
So now we can calculate its angular velocity:
The centripetal acceleration is given by
where
is the radius of the orbit
Substituting,
The law of conservation of momentum says that the total momentum in the system before and after the collision remains the same. Remember that <em>p = mv </em>(where p is momentum, m is mass, and v is velocity). To find the total momentum in the system, add up the momentum of each component.
Before the collision:
The momentum of the first cart is m*v = 1.5 * 1.2 = 1.8.
The momentum of the second cart is m*v = 0.75 * 0 = 0.
The total momentum is 1.8.
After the collision:
(where x is the unknown velocity):
The momentum of the first cart is m*v = 1.5x
The momentum of the second card is m*v = 0.75 * 2 = 1.5.
The total momentum is 1.5x + 1.5. Because of conservation of momentum, you know this is equal to the momentum before the collision:
1.8 = 1.5x + 1.5
Subtracting 1.5 from both sides:
0.3 = 1.5x
And dividing by 1.5:
x = 0.2 m/s forward (you know it is forward because it is positive)