Answer:
(a)
(b)
(c)
(d) = 22.41 m/s; = 189.92 m/s
(e) average velocity = (9i-21j-5) m/s
Explanation:
For the given problem:
(a) The velocity as a function of time: v(t) = dr/dt. Thus:
(b) The acceleration as a function of time: a(t) = dv/dt. Thus:
(c) The particle velocity at t= 2.0s. Using the equation in part (a);
(d) Its speed at t=1.0s and t=3.0s
at t=1.0s
= 22.41 m/s
at t= 3.0s
= 189.92 m/s
(e) The average velocity between t = 1.0 s and t = 2.0 s. Using the equation for r(t).
m
average velocity = Δr/Δt = (r2-r1)/(t2-t1) = (9i-21j-5) m/s
That's true. Light can travel through glass, water or jello,
but it also gets here very effectively through empty space,
from the sun and stars.
Answer:
Force=mass×acceleration.
4:5 for masses , 2:3 for acceleration.
For the first car it will be 4×2=8N
For the second car it will be 5×3=15N
Answer:
0.71ohms
Explanation:
AC and CB are in series hence the total resistance is 3+2=5ohms
AD and DB are in series hence the total resistance is 3+2=5ohms
These resistances are parallel to resistance AB
Let the equivalent resistance be R.
For resistances in parallel
Hence the total resistances are:
5//1//5
1/R =1/5 + 1/1 +1/5 = 1+5+1 /5 = 7/5
Hence the total resistance is R= 1/ 7/5 = 1×5/7= 5/7=0.71ohms