Do you know what lesson this is ? i can probably help
Answer:
Sound energy to electric energy - a person talking into a microphone
Radiant energy to electric energy - sunlight falling on solar panels
Gravitational potential energy to motion energy - a ball dropped from a height
Explanation:
A person talking is the sound energy and going into an electric phone
Sunlight or Radiant energy falls onto the solar panels creating electric energy
The ball is being pulled down by gravity from a certain height, going down to the ground, it’s motion, falling
Answer:
Positive charge is in the dough in which the negatively charged plums are embedded.
<span>Operant conditioning by Burrhus Frederick
Skinner, showed that people learn to behave in certain ways because of
reinforcement. This a product of a psychology school of thought, behaviorism,
which comes in the notion that whatever a person behave is what matters instead
of his mind, pioneered by John B. Watson. If a person wants to retain the
behavior, then he will do positive reinforcements example, positive stroking.
If the behavior is undesired and needs to be exterminated, then a punishment will
be instilled.</span>
Answer:
fr = 269.3 N
Explanation:
Let's use Newton's second law, for this it is good to see the attached diagram,
X axis
fr -F2 = 0
fr = F2
Y Axis
N-W = 0
We must include the rotation balance, place the rotation point at the bottom of the ladder and take the positive counterclockwise turns.
Σ τ = 0
F2 x -W y / 2 = 0
We look for x and y with trigonometry
sin 70 = y / L
cos 70 = x / L
y = L sin70
x = L cos 70
We substitute and calculate F2
F2 L cos 70 = W L sin 70 / 2
F2 = mg/2 tan 70
F2 = 20 9.8/2 tan 70
F2 = 269.3 N
From the first equation (x axis)
fr = F2
fr = 269.3 N