Recent content by themster

Would the value of h be 400m? from my working i can't seem to get the answer I converted 100km/h to 27.8m/s and 50km/h to 13.9m/s for KE before i get: 1/2 * m * V before^2 = 1/2 * 1500 * (27.8)^2 = 579630 for KE after i get: 1/2 * m * V after^2 = 1/2 * 1500 * (13.9)^2 = 144907.5 for the...

Homework Statement A small object of mass m is given an initial velocity u at point A. Just after it passes B the reaction force between the object and the surface drops at half the previous value. If the coefficient of friction between the object and the surface is μ=0.3, find the initial...

Homework Statement The disc rolls without sliding on the curved surface. What is the velocity of point A attached to the disc? Ans: 1.69 m/s, directed at 45o upwards. Homework Equations v=ωR The Attempt at a Solution v=ωR = 10rad/s * 40mm

ok sorry i didnot understand it first - i think i was confused by a 1 in 10 hill - what is it?

but how to you calculate gain in PE? PE1 - PE2? I know PE = mgh but what would the value for h be? I meant worked example by demonstrate it :)

would i convert the velocities into m/s? Do I find the differences between the KE and compare that with the PE? Would you be able to demonstrate it?

Homework Statement Ascending a 1 in 10 hill, a 1500 kg car slows down from 100 km/h to 50 km/h in a distance of 400 m. Calculate the net tractive force F between the tyres and the road assuming F remains constant and wind resistance can be neglected. Is the driver braking during this period...