The value of change in kinetic energy, ΔEk when a cart is being pulled forward by a hanging mass is Positive
In order words, ΔEk in the above question is positive
<h3>What is kinetic energy?</h3>
Kinetic energy can be defined as the energy a body possess when the body is in motion or due its motion
In conclusion, the value of change in kinetic energy, ΔEk when a cart is being pulled forward by a hanging mass is Positive
Learn more about kinetic energy:
brainly.com/question/25959744
#SPJ1
The atom is neutral because the number of protons is equal to number of electrons in which they cancel the charges of each other and the arom becomes neutral
Clear question is;
An ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone. What kind of change has occurred?
Answer:
Physical change.
Explanation:
There are two type of changes called physical change and chemical change.
In Physical changes, there is only change in the appearance of the substance and not its chemical composition. Whereas, in Chemical changes the substance changes entirely into another substance with a new chemical formula.
Now, for the ice cube, it has melted from a solid state to a liquid state. Thus, there is only a change in appearance and not its chemical composition. Thus, it's a physical change that has occurred.
I'm slightly dubious that you solved A). and B). on your own but you're having trouble with C).
In order to save myself a lot of work, I'll take your word for it. The answers shown there for A). and B). are correct, so I'll go directly to C).
The block breaks free of static friction and starts moving when there are 86 washers in the bucket.
Total mass of the bucket and washers is (0.120 kg) + 86(0.02 kg) = 1.84 kg
Total weight of the bucket & washers = (M) (G) = (1.84 x 9.8) = <em>18.04 N</em>
That's the tension in the string, sliding the block along the table towards the edge.
How much force of friction is pulling the block back, not letting it move ?
It's (weight of the block) x (coefficient of kinetic friction)
(M) (G) x (0.34) = (4.4) x (9.8) x (0.34) = <em>14.66 N</em>
The block has 18.04 N pulling it forward, and 14.66 N holding it back.
What's the <em><u>net force</u></em> on the block ?
18.04 - 14.66 = <em>3.38 N</em> forward, toward the pulley.
Take the magic formula that always connects acceleration with net force:
<em> F = M A</em>
You know 'F' and 'M' and you need to find 'A', so Divide each side by (M):
<em> A = F / M </em>and there you have it for the block.
A= F / M = (3.38 N) / (4.4 kg) = <em>0.768 meter / second-squared</em>
