Recent content by DavidDishere

Our teacher said that we will be taking a standardized final exam that is all multiple choice, purely conceptual. It's from motion in one direction, projectile motion, Newton's laws, uniform circular motion and things like that. Does anyone know where I can find a practice version of a test...

So 55 for #2. What is the answer to the impulse question? b?

On a level practice range, a 46 g golf ball is struck by a golf club and leaves teh ground witha speed of 72 m/s at an angle 40 degrees above the horizontal. how much work was done by the golf club on the golf ball? a. 32 J b. 120 J c. 230 J d. 520 J e. 3300 J It's just...

I understand what you are saying for #3 but what does that make the answer? C?

sin is opp/hyp right? r would be opp and d would be hyp. sin θ = r/d So dsin θ = r

Ahhh I was squaring m and r for some reason. Thanks. So C is the only correct answer for 2? I meant to say that I was thinking it was C but then could see that A and B might be right too. So maybe it was D. And can anyone explain the trailer problem? I guess I'm thinking of the car and...

At the start I have FTsin θ = mv2/r Put in dsin θ for r and move to the other side FTsin2 θ = mv2 Put in mg/cos θ from the y forces for FT mgdsin2 θ/cos θ = mv2 The masses cancel and 1 of the sin2/cos becomes tangent gd tan θ sin θ = v2 sqrt(gdtan θ sin θ) = v Did I do...

I just did 300 = mv2/r and solved for v. I got 51. I guess if I divide that by 2*pi*r, I get about 10.8 so maybe that is what I'm missing.

Homework Statement Consider a conical pendulum that consists of a bob on one end of a string of negligible mass with the other end of the string attached to a point on the ceiling, as shown. Given the proper push, this pendulum can swing in a circle at a given angle, maintaining the same...

#1) A child ties a .25kg rock to the end of a string and whirls it at a constant speed in a horizontal circle of radius 75 cm. What, approximately, is the maximum speed at which the stone may be whirled if the string will break for a tension exceeding 300N? A. 10 m/s B. 13 m/s C. 15...

(Start - Final) /2 is just a way to compute the average. Take any 2 numbers and divide them by 2 and you get the average of those 2 numbers. V bar is the average velocity.

Homework Statement The figure shows the quadriceps and the patellar tendons attached to the patella (the kneecap). If the tension FT in each tendon is 1.2 kN, what is (a) the magnitude and (b) the direction of the contact force θ exerted on the patella by the femur? Homework...