A student’s backpack, full of textbooks, is hung from a spring scale attached to the ceiling of an elevator. When the elevator is accelerating downward at 3.8 m/s2, the scale reads 60 N.
What is the mass of the backpack?
What does the scale read if the elevator moves upward while slowing down at a rate 3.8 m/s2?
What does the scale read if the elevator moves upward at constant velocity?
If the elevator had no brakes and the cable supporting it were to break loose so that the elevator could fall freely, what would the spring scale read?
An archer pulls the string of a bow back by 0.50 m, creating a tension of 150 N in the string. The mass of the arrow is 0.050 kg and the bowstring’s mass is negligible. What is the speed of the arrow after the bowstring is released and has returned to its equilibrium length? Assume that the force of the stretched bowstring on the arrow behaves like the force exerted by an extended spring and assume air resistance is negligible.