Hi there!
We can begin by calculating the distance remaining after the reaction time.
Δd = vt
Calculate the distance traveled within this time:
Δd = (16)(.79) = 12.64 m
Subtract from the total distance:
150 - 12.64 = 137.66 m remaining
We can use the following equation to solve for the acceleration necessary:
vf² = vi² + 2ad, where vf = 0 since the train will have slowed down to rest.
Rearrange in terms of "a":
0 = vi² + 2ad
(-vi²) = 2ad
(-vi²)/2d = a
Plug in the given values:
(-(16²))/2(137.66) = a
-256/275.32 = -.9298 m/s²
Answer:
220,500 Joules
Explanation:
PE = (75 kg) x (9.8 ) x (300 m)
PE = (735) x (300)
PE = 220,500 Joules
I believe the density will decrease, because if you look at the equation d=m/v. This can also be written as d=m(1/v). So if you increase volume, let's say you increase from 10ml to 1000ml. And keeping mass same, say 5 grams,then instead of having 1/10= 0.1ml then putting the equation together as 5x0.1. You will have for the second equation 5x(1/1000ml)= 5x0.001. You can see for yourself after multiplying these 2 values from the different equation which density value is smaller and larger.
Answer:
Crystal structure
Explanation:
The repeated pattern of similar particles in a material is called crystal. Crystal structure is the largest constituent unit of a solid matter.
The fundamental identity of a crystal structure is a unit cell that is formed by the arrangement of atoms or ions in a particular manner. A crystal is defined as a regular, long-ranged repeated arrangement of unit cells.
Crystal have a sharp melting and boiling point and they give a sharp edge on being cut with a knife.
Answer:
Sun is actually closest to the Earth during the winter months of North America.
During the summer months the sun rays hit directly to the surface.
During the summer months the days are longer.
Explanation:
1. The sun is actually closest to the Earth during the winter months of North America because of the Earth's elliptical orbit. The sun is farthest from the Earth during the summer months of North America.
2. During the summer months the sun rays hit directly to the surface i.e., they sun rays are less spread out causing the Earth to heat up more. During the winter months the sun rays hitting the Earth are more spread out causing the Earth to heat up less as compared to the summer months.
3. During the summer months the days are longer, this means that North America receives more sunlight heating the Earth's surface which means that the surface cannot cool down as the nights are shorter.