physics 211 help

By using an appropriate device, we can know the measure of a physical quantity.The accuracy of the reading depends on the device and the person taking the measurement. Therefore, accuracy means the extent upto which a measured value agrees with the standard or true value. For example, if ..

, called the moment of inertial of the body about the axis of rotation. Let us note the similarity between 'm' is the mass of the body and does not depend on the choice of the origin or the axes of rotation or the kind of motion. But, the moment of inertia depends on the choice of axis. However, bot..

The difference between the gravitational force and the centripetal force acting on our body is equal to our weight. If the rotation of the Earth were speeded up, then the Earth's gravitational force would be used to provide the required extra centripetal force. Hence, the weighing machine would ind..

will be in the direction of the bigger of the two vectors. The magnitude of i.e., B will be equal to the difference of the magnitude ..

Laws of Radioactive Disintegration - The number of atoms disintegrated per second at any instant is directly proportional to the number of radioactive atoms actually present in the sample at that instant. If N o be the total number of atoms at t = 0, N be the total number of atoms left in the sampl..

a) If two objects A and B are moving with same velocity but have different initial positions, then their position-time graph will be b) If velocity V A > V B i.e., V A - V B is +ve [O represents position and time of meeting] c) If velocity V A < V B , V A - V B is ..

There are some conditions associated with the process of combustion. The substance to be burnt must be combustible (the substance must catch fire easily). Wood, paper, coal, coke, hydrogen, liquified petroleum gas, natural gas, petrol, kerosene, diesel, alcohol, ether etc. are some of the combustib..

. The resulting not diffusion of electrons from one region to the other gives rise to a potential difference. This continues until the difference is enough to counter the not diffusion due to the temperature gradient. 3. A detailed proof (not shown here) shows that the seebeck emf V AB is given by ..

Consider the same situation as in the above section. Let the particle move from P to P 1 with velocity v in time dt. Let d q be very small. We know th..