1. A 140lb researcher received a shipment of lab equipment in a 2200 N crate. Sh
ID: 1277279 • Letter: 1
Question
1. A 140lb researcher received a shipment of lab equipment in a 2200 N crate. She pushes it across the floor applying a 90 N force with her hands. Which Statement is correct?
A) The crate will push back at her with a force of 140lb
B) If the crate is moving forward, she will feel it pushing back with less than 90 N
C) She will feel a 2200N force from the crate pushing back at her
D) Only if the crate does no move will she feel a force of 90 N
E) She always feels a 90 N force from the crate pushing back against her hands
2. You are standing on a bathroom scale inside an elevator. The scale reads 91% of your weight. Which statement is correct?
A) You are moving down at a constant velocity
B) You could be speeding up while moving upward.
C) You could be slowing down while moving upward.
D) None of the other statements is correct.
E) You must be at rest
3. You are standing on a bathroom scale inside an elevator. The scale reads 7% more than your weight. Which statement is correct?
A) You must be at rest
B) You could be speeding up while moving downward.
C) You could be speeding up while moving upward.
D) None of the other statements is correct.
E) You are moving upward at a constant velocity.
Please explain why. Thank you.
Explanation / Answer
Number 1)
By Newton's Third Law, which is...For Every Action, there is an EQUAL AND OPPOSITE reaction, the choice is...
Choice E.
Number 2)
The correct choice is C, you must have a smaller acceleration than that of gravity. Solwing down, while going upwards, reduces the overall effect of the feeling of Gravity.
Number 3)
The correct choice is again C. In this case you need a larger acceleration than that of gravity. Wgen accelerating upward the gravitational effect feels larger.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.