A stock person at the local grocery store has a job consisting of the following five segments:
(1) picking up boxes of tomatoes from the stockroom floor
(2) accelerating to a comfortable speed
(3) carrying the boxes to the tomato display at constant speed
(4) decelerating to a stop
(5) lowering the boxes slowly to the floor.
During which of the five segments of the job does the stock person do positive work on the boxes?
A) (1) and (5)
B) (1) only
C) (1), (2), (4), and (5)
D) (1) and (2)
E) (2) and (3)
Question 2
A person on a sled coasts down a hill and then goes over a slight rise with speed 2.7 m/s. The top of this rise can be modeled as a circle of radius 4.1 m.
The sled and occupant have a combined mass of 110 kg. If the coefficient of kinetic friction between the snow and the sled is 0.10, what friction force is exerted on the sled by the snow as the sled goes over the top of the rise?
What will be an ideal response?
A comparison between chromosomes found in a normal human cell and a cancer cell from the same person
The organization of segments in the Drosophila embryo
Indicators for assessing local blood flow
Arteriosclerosis is a local contraindication for massage of the lateral neck.
Farmers’ markets provide fresh, local produce to consumers
Techniques for Applying Local Anesthesia