Recent content by pianogirl

Oh yeah! Totally forgot that. Thanks! Will try again!

Homework Statement A smooth uniform rod AB, of length 3a and weight 2w, is pivoted at A so that it can rotate in a vertical plane. A light ring is free to slide along the rod. A light inextensible string is attached to the ring and passes over a fixed smooth peg at a point C, a height 4a...

But I still have two unknowns...? The range and the angle... or did I do something wrong?

Homework Statement Shells are fired from a gun at 210 m/s. What is the maximum range of the shells on horizontal ground? Homework Equations Suvat equations? The Attempt at a Solution x=210cos(theta)t y=210sin(theta)t - 4.9t^2 Not sure what to do after that. Help would be...

Homework Statement Two navigation beacons 60km apart transmit radio waves of wavelength 4000m. The signals start with the same phase and amplitude. A ship is midway between them and is sailing straight towards one of them. Describe what happens to the signals received on board the ship over...

Homework Statement With a wavelength of 12cm, how do I show that the microwave frequency is approx. 2.5GHz? Homework Equations v=f x lambda The Attempt at a Solution I'm confused about the wave speed bit...

Homework Statement A load of 200kg is lifted through 50m by a vertical cable. The load accelerates uniformly from rest for 20 seconds, travels at constant speed for 10 seconds then decelerates to rest in a further 10 seconds. Find the maximum speed attained and the tension in the cable at each...

Homework Statement Basically there's a question that I'm doing which asks me to show how to derive: n lambda=d sin theta We haven't learned it yet and so how do you do it? Homework Equations n lambda=d sin theta The Attempt at a Solution Not a clue! Thanks!