For n resistors in series, the equivalent resistance is given by the sum of the resistances:
In this problem, we have three resistors, so the equivalent resistance of the load is the sum of the resistances of the three resistors:
The relationship between the charge flowing through a conductor, the current flowing through the conductor and the time is:
Q = It
Where Q is the charge, I is the current and t is the time of application of the current. Substituting the values:
48.96 = 1.39 x t
t = 35.2 seconds
Answer:
4. both blocks will both have the same amount of kinetic energy.
Explanation:
When the blocks are released free from the compression force, the spring exerts equal and opposite force on each block but the block with heavier (double) mass will attain slower ( half ) speed as compared to the lighter block according to the law of inertia. This works in synchronization to energy conservation.
Spring force is given as:
where: 
length of compression in the spring
<u>We know kinetic energy is given by:</u>
Hence the kinetic energy of both the blocks is equal when they are released to move free.
Answer:
B
Explanation:
Any object will be acted on by a force, when that object is not moving (or has an acceleration equal to zero), then the forces acting on that object are considered to be balanced.
A: Is balanced, because a bridge has multiple structures in place that prevent it from being unbalanced, and falling over.
B: Is unbalanced, because during a roller coaster ride, the acceleration changes constantly. Hence, during its first drop, the roller coaster is being acted on by unbalanced forces.
C: Is balanced, because although there are two forces acting in opposite directions (the pulling from both sides), the overall <u>net force</u> is equal to zero.
D: Is balanced, because the car is not moving, and hence it will have zero acceleration.
