please check these:
In which of the following sentences is WORK used in the scientific sense of the word?
a. holding a heavy box requires a lot of work
b. a scientist works on an experiment in the laboratory
c. sam and rachel pushed hard, but they could do no work on the car
d. john learned that shoveling snow is hard work
i believe its C
What is the common fomula for work? Assume that W is the work, F is a constant force, delta V is the change in velocity, and d is the displacement
a. W=FdeltaV
b. W=Fd
c. W=Fd^2
d. W=F^2d
i think its A
A child moving at constant velocity carries a 2 N ice-cream cone 1 m across a level surface. What is the net work doneon the ice-cream?
is it 2 J?
thanks for helping
i don't understand?
never mind i get it
i've been writing the wrong answers
thanks
For the first question, "In which of the following sentences is WORK used in the scientific sense of the word?" let's go through the options:
a. "Holding a heavy box requires a lot of work." Here, the term "work" is being used in a general sense rather than the scientific sense.
b. "A scientist works on an experiment in the laboratory." This sentence uses the term "work" in a general sense, referring to someone performing a task.
c. "Sam and Rachel pushed hard, but they could do no work on the car." In this sentence, the term "work" is being used in the scientific sense because it states that no work was done on the car, indicating that no energy was transferred to it.
d. "John learned that shoveling snow is hard work." Once again, this sentence uses the term "work" in a general sense, referring to physical effort.
From the above analysis, it is correct to say that option c. "Sam and Rachel pushed hard, but they could do no work on the car" uses the term "work" in the scientific sense.
For the second question, "What is the common formula for work?" we have:
a. W = F * ΔV
b. W = F * d
c. W = F * d^2
d. W = F^2 * d
To find the answer, let's break down the variables:
- W represents work.
- F represents force (a constant force in this case).
- ΔV represents the change in velocity (speed).
- d represents displacement (distance).
Based on the variables provided, the correct formula for work is option b. W = F * d. This formula states that work equals force multiplied by displacement.
Finally, for the question "A child moving at constant velocity carries a 2 N ice-cream cone 1 m across a level surface. What is the net work done on the ice-cream?", we can use the formula for work (W = F * d) and plug in the given values:
W = 2 N * 1 m = 2 J
Therefore, the net work done on the ice-cream is 2 joules (J).
You're welcome! Let me know if there's anything else I can help with.