1. Order the fundamental force from the strongest to the weakest.
A. gravity, electromagnetic, strong
B. electromagnetic, strong, gravity
C. strong, electromagnetic, gravity
D. strong, gravity, electromagnetic
2. Electricity results from which fundamental force?
A. electroweak
B. strong
C. gravity
D. electromagnetic
3. The upward normal force exerted by the floor is 620 N on an elevator passenger who weighs 650 N. Is the passenger accelerating? If so, what are the magnitude and direction of the acceleration?
A. Yes, the passenger is accelerating downward at a rate of 0.45 m/s^2
B. No, the passenger is not accelerating.
C. Yes, the passenger is accelerating upward at a rate of 0.45 m/s^2
D. Yes, the passenger is accelerating downward at a rate of 30 m/s^2
Not sure please help me. Thanks.
the 1st two are look up
number three is a thinker
... the passenger's weight is less than normal, so the passenger (along with the elevator) is accelerating downward ... B and C eliminated
... gravitational acceleration is 9.81 m/s^2 ... D is eliminated
1. Is C? 3. Is A?
yes
and 2 is D? Thanks
1. To determine the order of the fundamental forces from strongest to weakest, you need to know the relative strength of each force. Here is a brief explanation of each force and its relative strength:
- Gravity: This force is responsible for the attraction between objects with mass. It is the weakest of the fundamental forces, but it acts over large distances. The strength of gravity is about 10^-38 times weaker than the strong force.
- Electromagnetic: This force is responsible for interactions between charged particles. It is stronger than gravity and acts over a range of distances. The strength of the electromagnetic force is about 10^36 times stronger than gravity.
- Strong: This force holds atomic nuclei together and is responsible for interactions between quarks. It is the strongest of the fundamental forces and acts at very short distances. The strength of the strong force is about 10^38 times stronger than gravity.
Now let's determine the correct order:
Option A: gravity, electromagnetic, strong - Gravity is indeed the weakest force, but electromagnetic is stronger than gravity, while strong is the strongest of all. This option is incorrect.
Option B: electromagnetic, strong, gravity - This option is correct. Electromagnetic is stronger than strong, and strong is stronger than gravity.
Option C: strong, electromagnetic, gravity - This option is incorrect. The correct order is electromagnetic, strong, gravity.
Option D: strong, gravity, electromagnetic - This option is incorrect. The correct order is electromagnetic, strong, gravity.
Therefore, the correct answer to question 1 is Option B: electromagnetic, strong, gravity.
2. Electricity results from the electromagnetic fundamental force. Therefore, the correct answer to question 2 is Option D: electromagnetic.
3. To determine if the passenger is accelerating, we can compare the sum of the forces acting on the passenger to their weight.
Given:
Normal force exerted by the floor = 620 N (upward)
Weight of the passenger = 650 N (downward)
If the passenger is not accelerating, the sum of the forces should be equal to their weight (Newton's first law). So, let's calculate the net force:
Net force = Normal force - Weight
Net force = 620 N - 650 N
= -30 N (downward)
Since the net force is not equal to zero, we conclude that the passenger is accelerating. The direction of acceleration is in the same direction as the net force, which is downward.
Now, to calculate the magnitude of acceleration, we can use Newton's second law:
Net force = Mass x Acceleration
Therefore,
-30 N = Mass x Acceleration
To find the acceleration, we need to know the mass of the passenger, which is not provided in the question. Therefore, we cannot determine the magnitude of the acceleration.
So, the correct answer to question 3 is:
B. No, the passenger is not accelerating.