Answer: B. irregular galaxy
Explanation: "An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy."
Answer:
U = 0.0207 J
Explanation:
We know that:
U =
where U is the potential energy, K the constant of the spring and x is the deformation.
so, the deformation is calcualted as:
x = 0.146m-0.116m
x = 0.03m
Finally, replacing the values of x and K, we get:
U =
U = 0.0207 J
PE stands for Potential Energy. It is the stored energy in an object due to its position with respect to some reference. It is expressed in Joules.
P.E = m * g * h OR P.E. = mgh
m - mass of the body
g - acceleration due to gravity
h - height attained due to the body's displacement.
K.E. stands for Kinetic Energy. It is the energy possessed by a body due to its motion.
K.E = 1/2 mv² where m = mass of the body; v = velocity with which the body is moving.
<span>Using the kinematic equation:
(final speed)^2 = (initial speed)^2 + 2 * acceleration * distance
(12)^2 = (0)^2 + 2 * acceleration * distance
The child and sled are accelerating under gravity which exerts a force down the hill, so acceleration = g = 9.8 m/s^2 in the "down" direction.
144 = 2 * 9.8 * "down" distance (height of the hill)
height of the hill = 7.35m</span>
It would <span>keep rolling without slowing down if no friction acted upon it.
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