I am plan on building a small refractor telescope about 20 cm long, i need your guys help !
1. What len is use for Objective len and what len is use for Eyepiece len ? (how is it look like)
2. How far should i place objective len and eyepiece len apart ?
3. If i make a 20 cm long refractor...
#1 No, I haven't studied the dot product yet
A) HOw much work is done by the gravitational force ?
b) Ho much work is done by 100 N force ?
c) What is the change in kinetic energy of the crate ?
d) What is the speed of the crate after it is pulled 5 m?
Sorry about that
#1
A 10kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 100Nparallel to the incline, which makes an angle of 20* with the horizontal. If the coefficient of kinetic friction is .40 and the crate is pulled a distance of 5 m.
a)HOw much work is done by...
OK, it was tricky !
And i was confused, how come the part a was so easy. Usually we use F=ma to find the acceleration when the problem involved with mass.
F_net (acting on the rocket) = 9000 (14.3) = 128700 N
F_net (rocket) = F_net (gas) (From your hints if this two force were equal, then how come the rocket laugh forward)
128700 = 740 a
a = 173.9 m/s2
Is this right ?
#1
Is that hints for part b
#2
F_apply = 30921.6 N
#3
Is that mean I was going on the right track right ?
F_apply = 262.9 N
a) the box moves
b)
F_friction = .12 (815.7) = 97.9 N
F_x = 310cos32 - 97.9 = 164.9 N
F = ma
164.9 = 100a
a = 1.65 m/s2
25 = (1/2)(1.65)t2
t = 5.5 s
Am i doing right ?
#1
Ricky is on a rocket ship far from any planet or sun. The 900kg rocket fires its rockets for 3.5s sec and goes from 0m/s to 50 m/s.(a)What acceleration does the rocket undergo ?(b) If 160 kg of gas is expelled from the rocket. what is the gasses acceleration ?
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vi = 50...