Answer:
a.) the speed at the bottom is greater for the steeperhill
Explanation:
since the energy at the bottom of the steeper hilis greater
As we can see from above that v is higher when h ishigher.
Answer:
Explanation:
Given that
At 17°C ,Lo= 20.09 cm
At 306°C ,L= 20.18 cm
ΔL= 200.18 - 20.09 = 0.09 cm
ΔT = 306 - 17 = 289°C
We know that
ΔL = L α ΔT
α =coefficient of linear expansion
ΔL = Lo x α x ΔT
0.09 = 20.09 x α x 289
Coefficient of linear expansion,
Explanation:
It is given that,
Mass of the box, m = 10 kg
Force with which the box is pulled, F = 50 N
It is moved a distance of 4 m
Force of friction acting on the box, f = 20 N
We need to find the initial kinetic energy the box have. It is clear that the box is at rest initially. As there is no motion in the box at that time. The formula for the kinetic energy of the box is given by :
As v = 0
So, the initial kinetic energy of the box is 0. Hence, this is the required solution.
Answer:
What evidence supports their claim.
Explanation:
In the end, all that really matters in an experiment, is what scientific evidence supports the claim being made.
Burning a substance means that you have damaged it, and this is irreversible, which is a quality that chemical changes have. Burning a substance also changes the substance into ash, which makes it a chemical change as the substance has been formed into something else.
I hope this helps!