Recent content by whitestrat69

Homework Statement A man (mass 80kg) reaches the edge of a 20m cliff in his car (mass 1600kg) at a speed of 150km/hr. He drives off the edge without a change in velocity. Calculate the speed at which he enters the water if he ejects from his car at 50km/yr just as the car reaches the water?

thankyou again!

ok just say you have these values: s=1.3m u=0ms v=? a=10 t=0.5099 Now these values represent the vertical part of a vector.. now to work out velocity it uses a formula, v=s/t, = 1.3/0.5099 = 2.55ms... which is incorrect.. . but using this formula.. v^2=u^2 + 2as...

thankyou!:smile:

no it wasnt, i haven't made any sufficient steps..

yes, that's what i initially thought as iv'e tried working this out... the velocity was not provided..?

Homework Statement A car collides with a brick wall and comes to rest. A parcel which was on top of the roof at the time becomes detached. It is initially traveling horizontally and it strikes the ground a distance of 12m from the point where it left the car. The parcel is initially 1.5 m above...

im currently studying redox in chemistry and I am really enjoying it so far. I am just a little bit confused about one section of it, that is that i cannot understand how to work out the product in the 1/2 equations .. e.g Fe2+ forms Fe3+.. but why does it form this.. i know iron is a...

ok I've tried the approach with the constant acceleration... this time i used the average velocity example of 18.89 ms-1 .. then i calculated the displacement using the s=ut+1/2at2 .. then i worked out the work and the power came to 133816.76 Watts... very close to the final answer!

yes I've realized my error... he accelerates in 4 seconds to that speed, and i was using the D=ST formula which is incorrect!.. as his speed isn't constant for a period of time... now i understand why the energy method is more accurate..

values: m=1500kg a=25ms-2 v=27.78ms-1 t=4 P=mv =1500 x 27.78 = 41670 SN Impulse = (delta) P f x 4 = 41670 F = 10417.5 N W = FS = 10417.5 x 111.12 = 1157592.16 J P = w/t = 1157592.16/4 = 289398.15 Watts the correct answer is: 144675.9 Watts...

i am currently momentum, work, energy and power in physics and i am currently confused in a few concepts. This question states that: A car with mass 1500kg accelerates from 0 to 100km/hr in 4 seconds. calculate the power output of the car. -- My teacher states to solve this question...