Recent content by Jason17

Homework Statement So i have been asked this question: Q. What happens if you have a microwave transmitter and receiver and you rotate the receiver at 90° 180° 270° and 360° 2. The attempt at a solution If i am correct, at 90° you will receive a signal because the wave can only...

sorry, i don't understand what your trying to say. Equation of motion? S=u.t + 0.5.a.t^2 ? or S=(u+v)/2 . t? I still can't get to 620km :(

Homework Statement A recording station observed that there was an interval of 68s between the reception of P (push or primary) waves and S (shake or secondary waves) from an underground nuclear test explosion. The speed of P and S waves in the Earths crust are 7800 ms^-1 and 4200 ms^-1...

Homework Statement Two fishing floats, a distance of 4.5 metres apart, bob up and down at 20 times per minute. The floats always move in antiphase. There is always at least one wave crest between the floats but never more than two. a) Show that the wavelength of the ripples on the river is...

Ok so i got these a: 3.6ms u: 85ms v: 0ms? t: ? Is that the right layout? But why would you want to find 't'? when your asked to find the 'length' ? I assume you get the value for 't' and substitute into s=ut+0.5at^2? Ps. How do you distinguish something as an initial velocity(u) and final...

wow.. i just figured it out myself just then. i look very stupid now :\ Ok i got part i) done but what about part ii) ?

Homework Statement An aircraft of mass 5.8 x 10^4 kg stands at the end of the runway ready for take-off. The engines provide a constant total thrust of 2.1 x 10^5N i)Calculate the initial acceleration in ms-2 of the aircraft as it starts to move ii) Calculate the length in m of runway...