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So, what do you mean by inverting the trig identity? Could you possibly, show me how to start this question? sin Alpha cos β = ½[sin (Alpha + β) + sin (Alpha − β)] <--- This is a trig identity I should be using? So would i just set Alpha = 2*pi*f*x/v and beta = 2*pi*f*t?

Homework Statement Show that the solution to the wave equation, Equation 15, can be rewritten as the sum of two transverse waves moving in opposite directions along the wire. Equation 15:y(x,t) = A(sin(2*pi*f*x)/v))*cos(2*pi*f*t) Homework Equations Superposition: y(x,t) =...

My question is whether the coefficient of friction can be negative?

Homework Statement I just did a lab at school dealing with coefficient of friction for an object on an incline. After all my calculations done, my answer is negative for a cart sliding down, dealing with kinetic friction. Homework Equations The Attempt at a Solution I have...

Homework Statement A ship traveling 55 degrees [W of N] is 65.0 km farther north after 3.0 h. What is the ship's velocity? Homework Equations N/A The Attempt at a Solution I am totally not sure how to start this problem. My teacher told me there are two type of problems, AIM or...

Well, I think that if the trampoline expands, the acceleration should be negative because your direction is negative.

Homework Statement For example, if given a question that has an object dropped onto a trampoline, the object will expand the trampoline when it hits it, would the acceleration be negative after the trampoline expands for example 1 meter? Homework Equations The Attempt at a Solution

I forgot that my Vi = 0 m/s therefore does not equate to a quadratic.

o wait, maybe i made a mistake.

Homework Statement Thelma and Louise's car falls off the edge of the Grand Canyon and plunges to certain catastrophe below. The depth of the canyon at this point is 500 m. (Assume it drops off) A) How long will it take the vehicle to impact the canyone bottom? B) What will the...

Homework Statement I have just a question to clarify. When an object is in free-fall the gravity is always + 9.81 m/s^2? and also when it is talking about two dimension kinematics gravity is working on an object thrown in the air it is -9.81 m/s^2? Homework Equations The Attempt at...

Is anyone going to help solve this problem please?

d = displacement/distance.

The answer given is 39 m.

Homework Statement A student throws a stone vertically downward with an initial velocity of 5.0 m/s from the top of a 165 m building. How far does the stone travel during its 4th second of travel? Homework Equations d= vit + 1/2at2 The Attempt at a Solution Vi = -5.0 m/s t =...