Answer:
1.6s
Explanation:
Given that A 1.20 kg solid ball of radius 40 cm rolls down a 5.20 m long incline of 25 degrees. Ignoring any loss due to friction,
To know how fast the ball will roll when it reaches the bottom of the incline, we need to calculate the acceleration at which it is rolling.
Since the frictional force is negligible, at the top of the incline plane, the potential energy = mgh
Where h = 5.2sin25
h = 2.2 m
P.E = 1.2 × 9.8 × 2.2
P.E = 25.84 j
At the bottom, K.E = P.E
1/2mv^2 = 25.84
Substitutes mass into the formula
1.2 × V^2 = 51.69
V^2 = 51.69/1.2
V^2 = 43.07
V = 6.56 m/s
Using the third equation of motion
V^2 = U^2 + 2as
Since the object started from rest,
U = 0
6.56^2 = 2 × a × 5.2
43.07 = 10.4a
a = 43.07/10.4
a = 4.14 m/s^2
Using the first equation of motion,
V = U + at
Where U = 0
6.56 = 4.14t
t = 6.56/4.14
t = 1.58s
Therefore, the time the ball rolls when it reaches the bottom of the incline is approximately 1.6s
Answer:
Explained
Explanation:
It is possible for the voltage amplitude across the capacitor to be greater than the voltage amplitude across the source because it is gonna charge to its peak and will add up the voltage level.Moreover,ac capacitance of capacitance can be changed by introducing di electric
so voltage can be changed !!!
Answer:
lead
Explanation:
Lead was once widely used in the United States as a gasoline additive.
Addition of lead is in the form of tetra ethyl lead(II).
It helps to improve the octane rating of gasoline and to produce more useful energy via each combustion step.
- The compound containing lead was banned due to the huge health risk it poses to people.
- Lead poisoning is a known defect that affects people.
- When the gasoline is combusted, it releases lead as a by-product.
- Exposure to a high level of lead can cause brain damage and kidney failure.
I think the correct answer would be B. The process of elastic rebound is being shown by the student. It is a theory that is used to explain earthquakes. It focuses on how energy is being spread in times of earthquakes. As the rocks on the fault experiences shift and force, these rocks would be accumulating energy causing it to deform reaching the internal strength and eventually exceeding it. At that moment, a rapid motion would happen along the fault, which releases the energy, then the rocks would go back to its original shape or the undeformed state. This theory is the first theory that sufficiently was able to explain earthquakes.