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 ?
------------------
vi = 50...
in this problem, there are only 2 force make the block able to slid. (and it is force of gravity on 12 kg and force friction on 7 kg.
So F net = F (gravity) - F (fiction)
Find the acceleration experienced by each of the two masses shown in the picture below if the coefficient of friction between the 7 kg mass and the plane is .25 ?
------------
In the picture, is the force of fiction go that way ?
http://img515.imageshack.us/img515/893/img3394dj7.jpg [Broken]...
Problem 1:
A box of books weighting 300 N is shoved cross the floor of an apartment by a force of 400 N exerted downward at an angle of 35.2* below the horizontal. If the coefficient of kinetic friction between box and floor is .57, how long does it take t move the box 4 m, starting from rest ...
#1
On takeoff, the combined action of the engines and wings of an airplane exerts an 8000N force on the plane, directed upward at an angle of 65* above the horizontal. The plane rises with constant velocity in the vertical direction while continuing to accelerate in the horizontal direction...
#1
A 5 g bullet leaves the muzzle of a rifle with a speed of 320 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the .82 m long barrel of the rifle ?
--------------------------
m = .005 kg
v (initial) = 320 m/s
d = .82m
F = ma
but i don't know how to find...
#1
mag = 429.5 N
acc is NorthEast with the value 1.6 m/s2
#2
OH, i forgot that equation ! Forgot to think of the term displacement !
d = 1.5 m
Is that correct ?
[SOLVED] Magnitude - Distance
#1
The force of the wind on the sails of a sailboat is 390 N north. The water exerts a force of 180 N east. If the boat (including crew) has a mass of 270 kg, what are the magnitude and direction of its acceleration.
---------------------------------
390 N...
An 850 kg car is moving to the right at 1.44 m/s. What is the net force on the car ?
I am totally off on this problem ! Can someone help ?
And in the problem above, it is different when the car moving left ?
Thanks