The correct answer to the question is : 7 m/s.
EXPLANATION:
As per the question, the apple is at a height h = 2.5 m.
The initial velocity of the apple u = 0
We are asked to calculate the final velocity [ v ] of the apple before touching the ground.
As the apple is falling under gravity, then the acceleration produced on the apple is nothing else than acceleration due to gravity.
Hence, acceleration a = g =
From equation of kinematics , we know that -
⇒
⇒
⇒
⇒
⇒ [ans]
Hence, the final velocity is 7 m/s.
Answer:
intensity is 8.9 x W/m²
power is 11.3 x W
Explanation:
Given data
distance = 20 light year
power output = 4.00 x 10^28
to find out
intensity of the starlight and the power of the starlight
solution
we know the intensity formula that is
intensity = power / area
so here power is 4.00 x 10^28 and area = 4π(20ly)²
intensity = 4.00 x 10^28 / (4π (20×9.46×10^15)²
intensity = 8.9 x
so intensity is 8.9 x W/m²
and
power is Intensity × Area
so power = 8.9 x × (π (6.37 × 10^6)²
power = 11.3 x
so power is 11.3 x W
Answer:
Potential energy = 3635.8 Joules
Explanation:
Given that,
Weight lifted by a weight lifter is 12 kg
It lifts to a height of 1.75 m
We need to find the potential energy to the wights now have. The energy possessed by an object due to its position or height above ground is called potential energy. Its formula is given by :
P = mgh
g is the acceleration due to gravity
So, the potential energy is 3635.8 joules.
Answer:
hope it helps
Explanation:
Boiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.
66 g of element Y is needed since the ratio between element X and element Y is 1:2