Our eyes detect light only within a range of frequencies called visible light.
Answer:
If there is a large difference between the concentration of one fluid and the concentration of the other, then the particles will diffuse faster. In the experiment, the dye particles in the food coloring are very concentrated.
Explanation:
Answer:
-4/7
Explanation:
Given the following
A=4i-10j and B= 7i+5j
A+ bB = 4i-10j + (7i+5j)b
A+ bB = 4i-10j + 7ib+5jb
A+ bB =
The vector along the x-axis is expressed as i + 0j
If the vector A+ bB is pointing in the direction of the x-axis then;
Hence the value of b is -4/7
Answer:
The data that we have is:
Initial height = 2m
Initial vertical speed: As the sister is only pushed, we can assume that we do not have initial speed in the vertical axis.
Then at the beginning, we only have potential energy, that (using the water as the zero in our axis) can be written as:
U = m*g*h
where m is the mass of your sister, g is the gravitational acceleration, and h is the initial height:
h = 2m
g = 9.8m/s^2
Now, when your sister is about to touch the water, all the potential energy has be transformed into kinetic energy:
K = (m/2)*v^2
Then we have, at that moment:
K = U
(m/2)*v^2 = m*g*h
We want to solve this for v, that is the velocity.
v = √(2*g*h) = √(2*9.8m/s^2*2m) = 6.26 m/s
So the speed at which your sister hits the water is 6.26 m/s
Answer:
4.7 × 10⁵J
Explanation:
E = I * a * t
80% = 0.80
25cm = 0.25m
52cm = 0.52m
0.90h = 3240s
E = (0.80)(1400)(0.25 * 0.52)(3240)
= 4.7 * 10⁵J