Recent content by zhenyazh

hi could some one give me an outline for the first question? i am have no idea what to do. and i have a test

would it be fair to say that it has only rotational energy becuase it is fixed at one end? thanks

hi, could some on help me understand why the following is true? for some of them i wrote exactly what i don't understand, for others i really have no idea Two uniform rods are connected to a table by pivots at one end. Rod B is longer than rod A. Both are released simultaneously from an...

hi, when will i use 0.5mv^2 and when will i use 0.5Iw^2 when will i use both? as far as i can see one represents the movement of the center of mass and the other the angular movement. so as far as i understand for a moving cylinder i would use the sum of those. but i can't think of any...

hi in rigid body questions are there cases where i should use moment conservation and not angular moment conservation or the opposite? when would i use which?

hi, i am trying to solve this question. A thin stick of mass M = 4.9 kg and length L = 2.6 m is hinged at the top. A piece of clay, mass m = 1.0 kg and velocity V = 4.9 m/s hits the stick a distance x = 2.20 m from the hinge and sticks to it. What is the angular velocity of the stick...

hi, can some one give me an outline of how to solve the following question? thanks Superman (mass=84.0 kg) must fly into a train (mass = 18079 kg) traveling at 75.0 km/hr to stop it. Calculate the minimum time Superman must take to stop the train, if the passengers experience an average...

this is exactly the point. to find the height relative to the spring rest position i need to use the harmonic motion x function. but some how it goes wrong. first i am not sure i am assigning values correctly and second when i do it i have the constant k both inside the cos and outside

anyone? i have the spring energy at first and i can calculate the potential energy when the mass is at the top. the problem is k is both in cos and outside it

a general question. suppose i have a spring and a block colliding it. the direction of the work vector is it defined by F or by X.

hi, could some one please explain where i am wrong? A mass M of 5.80E-1 kg slides inside a hoop of radius R=1.50 m with negligible friction. When M is at the top, it has a speed of 4.43 m/s. Calculate the size of the force with which the M pushes on the hoop when M is at an angle of 46.0°...

hi, can some one please tell me where am i wrong? A mass of 9.50 kg is suspended from a 1.19 m long string. It revolves in a horizontal circle. The tangential speed of the mass is 2.28 m/s. Calculate the angle between the string and the vertical. so what i need is the ratio between...

nope. i divided by two

hi, could some one explain where am i wrong? A proposed space station includes living quarters in a circular ring 53.5 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth? in such a station there is a centr...

Hi, could some one please explain in detail why this things are true? thanks A simple pendulum suspended in a rocket ship has a period T0. Assume that the rocket ship is near the Earth in a uniform gravitational field. True: If the ship accelerates downward at 9.81 m/s2, the pendulum...