Physics

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.

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  1. 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

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  2. 1. Is C? 3. Is A?

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  3. yes

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  4. and 2 is D? Thanks

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