Homework Statement
monochromatic light of wavelength 616nm is incident on a narrow slit. On a screen 1.7m away, the distance between the second diffraction minimum and the central maximum is 1.8cm. What is the width of the slit in mm?
Homework Equations
The Attempt at a Solution...
Homework Statement
A thin flake of mica (n= 1.58) is used to cover one slit of a double slit interference arrangement. The central point on the viewing screen is now covered by what had been the 9th bright fringe before the mica was used. What is the thickness of mica if light of wavelength...
thanks. I got the right answer...in the end. I was using a converter for the mach to meters a second conversation that's why i got it wrong. But thanks for the help
ohh, i didnt pick up on the rearranging error. Now I get the horizontal distance to be 5619.51223. Is that right. Then if i divide that by 442.5696 (which is mach 1.5) i get 12.70, but the correct answer is 11, am i still doing something wrong? do i use taht equation?
i still get the same horizontal distance. I use tan theta = opposite/adjacent, which i rearrange to tan theta x adjacent = opposite, so tan 0.73 x 5029 = 4500.54. Is that right because i still get the wrong answer
i converted mach to meters a second but if i use 1/1.5 i get 0.73 degrees for theta. Using this i got 3171.18m for the horizontal distance. Now do i use time = distance/velocity, and if so do i keep the speed in mach or meters a second
i did that an got the angle as 0.8867. then i used tan-1 x adjacent equals opposite, which i had as the horizontal distance. Then i used time = distance/velocity but still get the wrong answer. Can you please help, am i still doing something wrong
Homework Statement
A jet aircraft traveling with a velocity of mach 1.5 at an altitude of 5029m passes directly over an observer on the ground. How many seconds elapse before the observer experiences the sonic boom created by the jet? speed of sound= 343ms-1
Homework Equations
The...
Homework Statement
Two loudspeakers face each other at opposite ends of a long corridor. They are connected to the same sourrce that produces a pure tone of 343Hz. A person walks from one speaker towards the other at a speed of 0.7ms-1
What beat frequency does the person hear?
speed of...
so i have 1.64 from the first force i worked out and if i put the friction force into the work equation w= -0.2 x D i get -0.82. If I add the two works i have i get 0.82, but the answer is 1.3... can you give me hints on what I've done wrong??
Homework Statement
A force F=-4.3i+2.0j+1.5k Newtons exerts a displacement of d=-0.8i+1.8j+-3.6k metres upon a small (ie mass is negligible) object. If the friction force is equal to Ffr=-0.2,, then what is the net work done upon the object?
Homework Equations
The Attempt at a...
Homework Statement
A 380kg piano slides 3.5m down at 27 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of friction is 0.40. Calculate the force exerted by the man
Homework Equations
The Attempt at a...
i found this equation. R= v^2 sin 2 theta/g. If i put my values in there i get 2.23 x 10 ^4, the right answer is 1.28 x 10^-2. I am pretty sure this equation is the correct one, can you please give me hints on what I've done wrong?
Homework Statement
A particles position is given by r=42t^2i + 41t^3j + 6k. Calculate the magnitude of its acceleration at time t = 15 seconds
Homework Equations
The Attempt at a Solution
to find the acceleration i found the second derivative which i had as 246t + 84. Then i put...
so I used this equation to y=v^2y0-v2y/2g. I rearanged it using the values i had to work out vy0, which i got 32.56, i used the distance as y and v2y as 0. Then i put that into this equation vy0=v0sin theta, to work out theta. I rearranged it to vy0/v0 sin-1 = theta, i used my value for vy0 and...
so now i have (0.73 x mg) which is the Normal force, then i have mg as the gravitational force so if i add those together do i get ma? Then if I rrearrange m to the other side does that cancel the other m's? and is that the final answer?
Thats all th information the question gave me. Using a force diagram i see that the sum of forces in the downward direction is 0 when the elevator is not moving and by my working out it says its 7.154 when it is moving down. I don't know if this is what you mean or if its right, I just tried to...
one other question i need urgent help with please
Homework Statement
A person standing on a bathroom scale in an elevator notices that when the elevator starts to move their weight decreases to 0.73 of its original reading. What is the acceleration of the elevator?
Homework Equations...
Homework Statement
A hunter aims directly at a target (on the same level) 54.08m away. If the bullet leaves the gun at a speed of 143.91 m/s then at what angle should the gun be aimed in order to hit the target? (answer in radians)
Homework Equations
The Attempt at a Solution
Vx =...