A tourist bus is carrying passengers from the bottom of a hill to the top. The people, the bus, and the luggage can be analyzed
2 answers:
Answer:
The total amount of energy in the system decreases as the bus travels. This situation happens because some of the kinetic energy changes to thermal energy because of friction between the tires and the road.
Explanation:
In an isolated system (= no external forces acting on it), the mechanical energy of the system remains constant:
where U is the potential energy and K is the kinetic energy.
In this case, however, the system is not isolated. In fact, there is an external force acting on the bus: the force of friction. The force of friction acts against the motion of the bus, therefore the bus loses part of its energy, and its total energy decreases. This energy is converted into thermal energy (motion of the molecules of the surface of the road and of the wheel)
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Answer:
Explanation:
The resultant force F
where
is eastward force,
is force directed towards the North
F=62573.2 N
The magnitude of acceleration of sailboat is given by
The resultant static friction force is equal to 20 N to the left.
Why?
I'm assuming that you forgot to write the question of the exercise, so, I will try to complete it:
"A 50-n crate sits on a horizontal floor where the coefficient of static friction between the crate and the floor is 0.50 . A 20-n force is applied to the crate acting to the right. What is the resulting static friction force acting on the crate?"
So, if we are going to calculate the resulting static friction force, it means that there is no movement, we must remember that the friction coefficient will give us the maximum force before the crate starts to move.
We can calculate the static friction force by using the following formula:
Since the crate is not moving (static), the static friction force acting on the crate will be equal to the applied force.
Calculating we have:
Hence, the static friction force is equal to 20 N to the left (since the applied force is acting to the right)
So,
Since the static friction force is equal to the applied force, the crate does not start to move.
Have a nice day!