Answer:
12V
Explanation:
Given parameters:
Resistance = 12ohms
Heat released = 144J
Time taken = 12s
Unknown:
Voltage at the ends of the conductors = ?
Solution:
To solve this problem, we must first determine the power expended by the circuit.
Power is the rate at which work is done;
P =
=
= 12W
Electrical power is given as;
P = IV =
Since V is the unknown, we solve for it;
12 =
V = 12V
Answer:
Explanation:
Mathematically, linear momentum is expressed as the product of mass and velocity. Linear momentum conservation law states that a body or system of bodies retains its total momentum unless an external force is applied to the system.
In this case, the system consists of two carts.
At the start, the linear momentum (P) of the system is equal to:
It's only composed of linear momentum of the standard cart because cart A doesn't have any linear momentum at that moment.
After the collision, linear momentum has to be the same
where m_A is the mass of the cart A.
Solving for m_A
After the cart A rebounds, the linea momentum of the system has changed (because of the force present in the rebound). The new linear momentum is:
Then, the lump of putty is added to the system, but the linear momentum has to be the same, because we added a mass, not a force. The mass of that putty (m_p) has to be added to the equation of the system
Solving for m_p