Explanation:
Given:
Δx = -100
v = 10
a = 20
To find v₀, use a kinematic equation that's independent of time.
v² = v₀² + 2aΔx
(10)² = v₀² + 2(20)(-100)
100 = v₀² − 4000
v₀² = 4100
v₀ = ±64.0
As your teacher said, v₀ can't be +64.0. So v₀ = -64.0.
Next, to find time, use a kinematic equation that's independent of initial velocity.
Δx = vt − ½ at²
-100 = (10) t − ½ (20) t²
-100 = 10 t − 10 t²
-10 = t − t²
t² − t − 10 = 0
Solve with quadratic formula:
t = [ -(-1) ± √((-1)² − 4(1)(-10)) ] / 2(1)
t = (1 ± √41) / 2
t > 0, so:
t = (1 + √41) / 2
t ≈ 3.70
Answer:
• The greater the amplitude, the louder the sound
• The lower the amplitude, the lower the sound
I hope it helped you! ^^
I believe the answer is <u>C</u>
I hope this helps! Have a nice day, make sure to take care of yourself. You're loved <3
Answer:
Explanation:
Electricity is generated from solar energy predominantly by the use of photovoltaic cells.
The sun is the ultimate source of energy for all life and the bulk of the solar system at large.
Energy from the sun is used for various life processes and other abiotic uses.
In order to harness the sun's energy to produce electricity, a photovoltaic cell is required. These cells are often used in making solar panels which are available in most places today.
Electricity is produced by the movement of electrons within a cell or a body. In a photovolatic cell, the radiation from the sun causes chemical reactions to occur on the surface of these materials. The reaction is such in which electrons are produced. The movement of electrons in these cells results in the generation of electricity.
In some other cases, sunlight can be concentrated for heating water to produce steam. Steam can be used to drive turbines to produce electricity too.
