V = (1 / p) × p0×V0 = (1 / 219kPa) × 117kPa × 3L = 1.06L
Answer:
4.17 m/s²
Explanation:
We are told the reaction time is 0.2 s. Now, during this reaction time the car is going to travel an additional distance of
: x = u × t = 40 × 0.2 = 8 m
where u is the initial velocity of the car which is 40.0 m/s.
We are told that he had 200 m to stop before applying brakes. Thus, after applying brakes, he now has a distance to cover of; s = 200 - 8 = 192 m
Since vehicle is coming to rest acceleration would be negative, thus using Newton's equation of motion, we have;
v
² = u² - 2as
v = 0 m/s since it's coming to rest
u = 40 m/s
s = 192 m
Thus;
0² = 40² - 2(a)(192)
0² = 1600 - 384a
a = 1600/384
a = 4.17 m/s²
In most cases the temperature must increase for thermal expansion to occur. Most substances expand as temperature increases because the atoms or molecules vibrate faster as temperature increases and experience greater separation.
Answer:
A particle at t1= -2 seconds is at x1=4.8cm and at t2=4 seconds is at x2=9cm. Why can’t you calculate the average speed from this data?
Explanation:
the average speed of the distance travelled is needed to be know and we were only given displacement.
Answer:
Diffusion
Explanation:
Diffusion is a phenomenon whereby particles move from an area of higher concentration to an area of lower concentration.
Now, when the chemical substances of the perfume are sprayed in a room, their particles will now mix with the particles of the surrounding air.
Furthermore, the particles of the perfume which is like gas will be free to move in a very fast manner in all directions. Thus, they will eventually spread throughout the whole area where you are and thus move from the area where it is sprayed which is the area of higher concentration to the area where you are which includes your nose which is the area of lower concentration.