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Annette [7]
3 years ago
9

A sunflower turns its head toward sunlight. What triggers this behavior in a sunflower?

Physics
1 answer:
UNO [17]3 years ago
7 0
This is triggered by an activity known as heliotropism, or solar tracking. Special motor cells at the bases of the flowerbuds shrink or enlarge as they absorb water, which moves their faces toward the sun.
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If the height of the ramp is increased then the marble's speed will be greater because gravity will have less resistance when pu
Alik [6]
If you increase the steepness of the ramp, then you will increase the acceleration of a ball which rolls down the ramp. This can be seen in two different ways: 

<span>1) Components of forces. Forces are vectors and have a direction and a magnitude. The force of gravity points straight down, but a ball rolling down a ramp doesn't go straight down, it follows the ramp. Therefore, only the component of the gravitational force which points along the direction of the ball's motion can accelerate the ball. The other component pushes the ball into the ramp, and the ramp pushes back, so there is no acceleration of the ball into the ramp. If the ramp is horizontal, then the ball does not accelerate, as gravity pushes the ball into the ramp and not along the surface of the ramp. If the ramp is vertical, the ball just drops with acceleration due to gravity. These arguments are changed a bit by the fact that the ball is rolling and not sliding, but that only affects the magnitude of the acceleration but not the fact that it increases with ramp steepness. </span>

<span>2) Work and energy. The change in potential energy of the ball is its mass times the change in height (only the vertical component counts -- horizontal displacements do not change gravitational potential energy) times the local gravitational acceleration g. This loss of gravitational potential energy shows up as an increase in kinetic energy. If the ball falls a farther distance vertically, it will have a greater kinetic energy and be going faster. Again, the kinetic energy is shared between the motion of the ball going somewhere, and the rotation of the ball, and so the details of the acceleration depend on the ball (is it hollow or solid?), but the dependence on the steepness of the ramp is the same. </span>
7 0
3 years ago
What conclusions can be drawn about the existence of carbon-12, carbon-13, and carbon-14?
SashulF [63]
<span>These are isotopes of carbon and they all contain 6 protons and 6 electrons but each contains a difference number of neutrons - 6, 7, and 8 respectively.

^ This is the answer because an isotope changes the atomic mass, NOT atomic number. That means that the neutrons are changed, not the protons. </span>
7 0
3 years ago
Read 2 more answers
Một nguồn O phát sóng cơ dao động theo phương trình u = 4cos(4pi t - pi/4). Tốc độ truyền sóng là 1m/s.
brilliants [131]

Answer:

ytrxrddyoxswsdyxgxghfx

jdjdu3jthh

hhhujusbrnog

hhjfjtinrny

ykrjrhrnirjtjjtt

tkrjthr74uu3jt

hri4urjjrjtjjtjtjy

y

Explanation:

uueuhhhwuejroskanficndui39wn

jebfufkr

5 0
3 years ago
About 60 percent of all known galaxies are classified as _____.
masha68 [24]
The answer that fills in the blank is the galaxies which are six percent is classified as the elliptical planet. The 60 percent are considered to be elliptical planets because they move in a way of the elliptical path that considers them to be more of an elliptical planet.
8 0
3 years ago
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An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will:.
vitfil [10]

Answer:

Move the opposite direction ( at a lesser magnitude of velocity)

Explanation:

7 0
2 years ago
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