Grade 12 physics Definition and 62 Threads

Homework Statement an oil stick 122 nm thick (n=1.40), lying on water, is illuminated by white light incident perpendicular to it's surface. What is the wavelength of the color that appears? Homework Equations I'm not sure, but i tried n= Lambda(air)/Lambda coating in order to find the...

Homework Statement A pulley device is used to hurl projectiles from a ramp (uk=0.26) as illustrated in the diagram. The 5.0-kg mass is accelerated from rest at the bottom of the 4.0 m long ramp by a falling 20.0-kg mass suspended over a frictionless pulley. Just as the 5.0-kg mass reaches the...

Homework Statement Alright, just started physics and I've already fallen behind :( trying to do my homeowkr and I am completely lost, no idea at all. So here's a question which i had no idea how to do. * A tree house has a vertical "fire pole" of smooth metal, designed for quick...

okay so here's the question...can anyone figure it out... the question is... Sound with a frequency of 442 Hz. travels through steel. A wavelength of 11.66 m is measured. Find the speed of the sound in steel. Please help...i really need some direction

A block weighing 80N rests on a plane inclined at 20 degrees to the horizontal. The coefficient of static friction is 0.25, while the coefficient of kinetic friction is 0.15. a) What is the minimum force F, parallel to the plane that will prevent the block from slipping down the plane? b)...

Body B weighs 440 N and body A weighs 140N. The coefficients of friction between B and the incline are Us = 0.56 and Uk = 0.25. a) Find the acceleration of the system if B is initially at rest b) Find the acceleration of the system if B is moving up the incline c) Find the acceleration of...

5. A particle with a charge of -4.00 × 10-6 C moves through a uniform electric field of 70.0 N/C directed downwards. It is moving horizontally at 12.0 cm/s exactly between two plates that are 10.0 cm apart. The particle has a mass of 0.0400 g. a. What is the net force on the particle? b...

I have two questions that I need answers for: 1. A small truck and a large truck have the same kinetic energies. Which truck has the greater momentum? Justify your answer. 2. (a) Can an object have kinetic energy, but no momentum? Can an object have momentum, but no kinetic energy...

Grade 12 physics problems :( One question: Because of absorption, a Polaroid will actually transmit 40% of nonpolarized light incident on it. Two such Polaroids with their axes aligned will transmit a. 16%. b. 24%. c. 30%. d. 32%. e. 40%. The answer is 32% and I have no cue...

I am in grade 12 physics, and i have to practice equation proofs. I am currently studying work, kinetic energy, springs, and potential energy (gravity and elastic). Does anyone have a good proof?

Bonus Question... So my teacher gave us this question... where he describes that. "We have a heavy box, we want to move it but can NOT apply horizantal force (meaning CANT get on your knees and push it) we would have to either push down on it at an angle to move it, or pull up and push (or pull...

HELP! I am in grade 12 physics and my teacher gave us a puzzler for the weekend. I need serious help with it and all of my classmates can't figure it out either! The question is : A 10.8 kg box is 5.0 m from the edge of a 12.96 m high cliff. Bob pushes the box over the edge of the cliff by...