Recent content by blueray101

Is this directed at the 2nd or 1st part of the question? I assume the first part is correct then? If the contact force is vertical, then the angle it makes with the horizontal is 90 degrees?

Hello, I am actually doing this question as well. I am up to this bit: b)What is the rate at which friction is doing work on him? I am a bit confused about the direction of the velocity for friction. I assume its velocity is parallel to the incline? This is what I have for part b so far. I'll...

Homework Statement A horizontal force F is applied to hold a block, mass m = 1.7 kg against a vertical wall. The coefficients of kinetic and static friction between the block and wall are 0.81 and 0.87 respectively. F is gradually reduced until the block falls. Just before it falls, what is the...

lol try 180*1.57?

As far as I am aware, t=7.2 milliseconds which is 7.2*10^-3. Am I suppose to use a different value?

Homework Statement Part 1: I've worked out part 1 already. The answer is 4650m/s^2 A ball travels vertically downwards until it hits a concrete floor with speed 22.7-m/s. It then bounces vertically upwards at 10.8-m/s. Examination of a high speed video shows that the collision took 7.2-ms...