PHYS 1080 Study Guide - Final Guide: Gravitational Potential, Transpiration, Mass Diffusivity

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taupellama890

5 Dec 2012

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Relationship between object"s motion (kinematics) and forces acting on it (newton"s laws) If a=0: v=vo and x=xo + vot displacement is positive. Gravity influences motion with constant vertical acceleration g= 9. 8m/s2, motion in the horizontal and vertical direction are independent of each other. Pen swipe: swipe over gives cos, away gives sin; put pen over vector r and then rotate it from there to component of interest. Motion occurs at constant velocity but total motion is due to contribution from 2 factors. Someone trying to swim directly across a river with a current. Usually contain 3 velocities: identify 2 and add to determine 3rd (resultant) Wind speed or water speed not likely resultant velocity. Combine to give resultant or net motion. Interaction between 2 bodies: an object and an agent. Without a force there is no acceleration. Can be produced with or without contact. Types: gravitational, normal force, tension, friction, magnetic/electric.

Related Questions

Part A

An object cannot remain at rest unless which of the following holds?

The net force acting on it is zero.

The net force acting on it is constant and nonzero.

There are no forces at all acting on it.

There is only one force acting on it.

Part B

If a block is moving to the left at a constant velocity, what can conclude?

There is exactly one force applied to the block.

The net force applied to the block is directed to the left.

The net force applied to the block is zero.

There must be no forces at all applied to the block.

Part C

A block of mass 2kg is acted upon by two forces: 3N (directed to the left) and 4N (directed to the right). What can you say about the block's motion?

It must be moving to the left.

It must be moving to the right.

It must be at rest.

It could be moving to the left, moving to the right, or be instantaneously at rest.

Part D

A massive block is being pulled along a horizontal frictionless surface by a constant horizontal force. The block must be __________.

continuously changing direction

moving at a constant velocity

moving with a constant nonzero acceleration

moving with continuously increasing acceleration

amethystraven1

The kinetic theory of gases states that the kinetic energy of a gas is directly proportional to the temperature of the gas. A relationship between the microscopic properties of the gas molecules and the macroscopic properties of the gas can be derived using the following assumptions: The gas is composed of pointlike particles separated by comparatively large distances. The gas molecules are in continual random motion with collisions being perfectly elastic. The gas molecules exert no long-range forces on each other. One of the most important microscopic properties of gas molecules is velocity. There are several different ways to describe statistically the average velocity of a molecule in a gas. The most obvious measure is the average velocity Vavg. However, since the molecules in a gas are moving in random directions, the average velocity is approximately zero. Another measure of velocity is (V^2)avg, the average squared velocity. Since the square of velocity is always positive, this measure does not average to zero over the entire gas. A third measure is the root-mean-square (rms) speed,Vrms , equal to the square root of (V^2)avg. The rms speed is a good approximation of the the typical speed of the molecules in a gas. This histogram (Figure 1) shows a theoretical distribution of speeds of molecules in a sample of nitrogen () gas. In this problem, you'll use the histogram to compute properties of the gas.

Part A

What is the average speed

of the molecules in the gas?

Part B

Because the kinetic energy of a single molecule is related to its velocity squared, the best measure of the kinetic energy of the entire gas is obtained by computing the mean squared velocity, $(v^2)_{\rm avg}$ , or its square root. The quantityis more common than $(v^2)_{\rm avg}$ because it has the dimensions of velocity instead of the less-familiar velocity-squared.

What is the rms speedof the molecules in the nitrogen gas?

Express your answer numerically to three significant digits.

Part C

What is the temperatureof the sample of $\rm N_2$ gas described in the histogram?

Express your answer in degrees Celsius to three significant figues.

viridianjackal166

PHYS 1080 Study Guide - Final Guide: Gravitational Potential, Transpiration, Mass Diffusivity

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