Answer:
Inward
Explanation:
As the centripetal force acts upon an object moving in a circle at constant speed, the force always acts inward as the velocity of the object is directed tangent to the circle. This would mean that the force is always directed perpendicular to the direction that the object is being displaced. hope this helps :)
Explanation:
This question is not feasible. There is no way to calculate the energy needed because the question is missing the final temperature
The time taken by the sled to reach 45 m to the bottom is 4.24 s.
The sled's initial velocity <em>u</em> is zero. It has an acceleration <em>a</em> of a value 5 m/s² down the hill and it travels a distance <em>s</em> equal to 45 m down the hill.
Use the equation of motion,
Substitute 0 m/s for u and rewrite the equation for t.
The sled takes a time of 4.24 s to reach the bottom of the hill
Answer:
Correct answer: F = 50 N weight of backpack
Explanation:
Given:
W = 200 J work against gravity
h = 4 m
F = m g = ?
g = 10 m/s²
The work done is a measure of change in this case of potential energy
W = Δ Ep = m g h = F · h ⇒ F = W / h =
F = W / h = 200 / 4 = 50 N
F = 50 N
God is with you!!!
Chemical equations can be written down in 3 steps:
As example I’ll using the rusting of iron (as given)
1) Write down the products that react on the left side of the arrow.
2) Write the products after the reaction on the right side of the arrow. If there are one or more of a different atom that isn’t on the other side of the equation, the reaction is missing something on either sides.
Fe -> Fe2O3
But as you can see there are no O on the left side. The right formula is:
Fe + O2 -> Fe2O3
Review to make sure you wrote down everything.
3) Count all the atoms of each elements on each side. Balance out the amount of atoms on both sides by adding coefficients to your compounds
Take note that you need to multiply all the elements in the compound times the number
Fe + O2 -> Fe2O3
We need at least 2 iron atoms to balance out on the iron.
2Fe + O2 -> Fe2O3
Now we see that we have 2 O atoms on the left and 3 on the right. The smallest number that is divisable by both 2 and 3 is 6. Add coefficients in front of O2 and Fe2O3.
2Fe + 3O2 -> 2Fe2O3
Now we see that on the right there are 4 iron atoms. Balance out by multiplying iron on the left by 2.
4Fe + 3O2 -> 2Fe2O3
This is the final equation.
