Two physics questions on fluid mechanics?
Just for clarification, P is density, p is pressure, and V is volume in my questions. 1) Just pretend this diagram is drawn well. It is a pipe with a liquid flowing through it. http://img91.imageshack.us/img91/5074/horizontalpipemn7.png The density of the liquid flowing through the horizontal pipe in the drawing is 1500 kg/m^3. The speed of the fluid at point A is 5.5 m/s while at point B it is 8.0 m/s. What is the difference in pressure, pB - pA,between points B and A? 2) A small sculpture made of brass (Pbrass = 8470 kg/m^3) is believed to have a secret central cavity. The eight of the sculpture in air is 15.76 N. When it is submerged in water, the weight is 3.86 N. What is the volume of the secret cavity?
Mechanics (M1) question?
i cant understand the part one , if you could add some drawing it would help for part 2 ma = mass of particle A 0.8kg mb = mass of particle B 0.6kg the acceleration will be a= (g * mb) / (ma+mb) a= 9.81ms^-2 * 0.6 / 1.4 = 4.2 ms^-2 next a = 4.2 ms^-2 s= 1m formula s= 1/2 a t² u can find t t= 0.67 s formula v = a* t u can find v v= 2.9m/s
Mechanics friction questions?
i have two questions of mechanics which i dunno how to solve :( pls help me here (a) a solid cylinder of mass 6 kg is lightly held, with its axis vertical, in the jaws of a vice, and is on the point of slipping downwards. the magnitude of the force exerted by each of the jaws is 70N. calculate the coefficient of friction between the vice and the cylinder. (b) a builder holds up a vertical piece of plate glass of weight 40N by pressing the two sides with forces of P N from the palms of his hands. if the coefficient of friction is 1/4, what is the least value of p needed if the glass is not to slip?
Maths mechanics question - pulleys?
A tape is wound round two smooth cylinders (in an tipped over S shape, 1 cylinder above the other; lower cylinder first then higher cylinder). The higher cylinder is fixed, but the lower cylinder sits in a loop formed by the tape. If the 5kg block (attached to the bottom of the tape hanging from the higher cylinder) descends at a constant speed, calculate the mass of the lower cylinder. It looks kinda like below if that helps | |o| <--higher cylinder |o| | D <---5 Kg weight.
Need help with mechanics question!?
Let P catch Q after a time t. Let s1 be the distance traveled by P and s2 be the distance traveled by Q. s1 = ut + 1/2*at^2 u = 0 a = 2 So s1 = t^2 s2 = v*t = 3t After time t, distance traveled by P is 10 more than distance traveled by Q : s1 = s2 = 10 t^2 - 3t - 10 = 0 (t - 5)(t + 2) = 0 t = -2, 5 Since time cannot be -ve, we neglect -2 Hence t = 5s Distance traveled by P in 5 s = t^2 = 5^2 = 25 m Hope this helps. your_guide123@yahoo.com
((( URGENT )))Mechanics Question? Help?
Q is hanging, so of course it'll pull P.
SUVAT Mechanics/Physics Question - AS Level?
Two cars are travelling towards each other on a single-track road with equal speeds of 35m/s. When they are a distance of 500m apart, they both decide to brake. a) What minimum equal decelerations would they require to just avoid an accident? The brakes on one car fail and it continues with the same speed. The other car slows down and at the point of collision it has just stopped. b) What distances have the two cars travelled when the collision occurs? c) What time has elapsed? Any help with working would be really appreciated!
Mechanics question regarding collisions?
8.3333333333333333333333333333333 m/sec^2 Force = mass x acceleration, F = ma 50 g x 5 m/sec^2 = 250 g m/sec^2 30 g x a = 250 g m/sec^2 250 g m/sec^2 / 30 g = 8.3333333333333333333333333333333 m/sec^2 Thanks to the control freak above who couldn't answer the question and told you to put it in the physics section. The first time I solved this I thought I got a wrong answer, so I didn't post a response. Because of his post I realized that I did have the right answer the first time.