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...
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...
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...
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 ?
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 ...
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...
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...
[SOLVED] Magnitude - Distance
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.
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 ?
A bullet traveling 800 m/s horizontally hits a target 180 m away. How far does the bullet fall before it hits the target ?
d = 180 m
Vx = 180 m/s
t = .225 s
a = -9.8 m/s2
t = .225 s (time in x direction = time in y direction)...
A student stands at the edge of a cliff and throws a stone
horizontally over the edge with a speed of 18 m/s. The cliff is 50 m above a flat horizontal beach. How long after being released does the stone strike the beach below the cliff ? With what speed and angle of...
Two people pull on a stubborn mule, as seen from a helicopter in Figure 1. Find (a) the single force that is equivalent to the two forces shown, and (b) the force that a third person ould have to exert on the mule to make the net force equal to zero.
A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 12 m/s, skates by with they puck. After 3.0s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 4.0 m/s2. How long does...
I am planning to persuade the Computer Hardware Engineer career. And I also planning to work in CA(San Jose) or AZ(Phoenix). So i wonder will you get a good pay ? Is there a big chance that i will be laid off.
a) A ball is throwing straight upward, Is that motion positive or negative acceleration/velocity/displacement ?
b) A ball is falling down (what go up must come down), Is that a positive or negative acceleration/velocity/displacement ?
a) A car is moving forward...
Runner A is initially 4.0 mi west of a flagpole and is running with a constant velocity of 6.0 mi/h due to east. Runner B is initially 3.0 mi east of the flagpole and is running with a constant velocity of 5.0 mi/h due west. How far are the runners from the flagpole...