electric potential energy

Hi. Does the electric field always move from positive to negative? If I'm told that a uniform electric field of magnitude 4.1 x 10^5 N/C points in the positive x direction, and a 4.5 micro-C charge moves 6.0 m in the positive x direction, and to find the electric potential energy (which is -11 J), does my equation look lik ...continues

electric field, electric potential

Four quick conceptual questions: 1) Is the electric field (E = -delta V / delta s) always a positive number (or zero)? That is, is it always the absolute value of the magnitude of the electric field? Or can it have a negative value? 2) Is electric potential (delta V) always negative? The answer to one of the questions in m ...continues

Graphing with time, velocity, and acceleration.

The velocity of a car on a straight stretch of highway is recorded every 5 seconds. The data is in the table below. A negative velocity means that the car is traveling east. A positive velocity means it is traveling west. Make a velocity versus times graph, that is, plot velocity on the vertical axis and time on the horizont ...continues

density, acceleration, mass, gal/min, distance

Please give answer and explaination with steps if needed please. 1) A block of material has dimensions 3.8cm by 6.1 cm by 3.8cm. Its mass is 594g. What is the density? Answer in units of g/cm^3 2) An acceleration of 4.2 mi/h/s is equal to: Answer in units of m/s^2. 3) Grains of fine beach sand are assumed to be sp ...continues

average velocity and distance

1) Two ants race across a table 72.5 cm long. One travels at 4.02 cm/s and the other at 2.7 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm. 2) The position of a car coasting down a hill was observed at various times and the results are summarized in the table below ...continues

average velocity

1) The position versus time for a certain object moving along the x axis is shown. The objects initial position is -3m. The graph points since I cannot draw it start at (0,-3),(2,9),(3,6),(4,4),(5,4),(6,0),(7,-4) and (9,0). a) Find the average velocity in the time interval 0s to 2s in m/s. b) Find the average velocit ...continues

average velocity

Please give answer and step by step answer please. 1) The position versus time for a certain object moving along the x-axis is shown. The objects initial position is -3meters. The graph is position in meters for the y axis and the x axis is time in seonds. Point one on the grpah for 0 sec. is at (0,-3), 1 sec at (1,3), ...continues

mass

1) Grains of fine beach sand are assumed to be spheres of radius 57.5 micro meters. These grains are made of silicon dioxide which has a density of 2600kg/m^3. What is the mass of each grain of sand and answer in kg. Got answer of 2.1 * 10^-9 kg from previous work, but wrong answer. Please step by step help work this o ...continues

Displacement, avg. velocity,, avg. speed

1) The definition of change is: a) initial value - final value b) final value - initial value c) amount of increase d) amount of decrease e) none of above 2) Displacement is defines as: a) distance traveled b) length of journey c) change in position d) initial position - final position e) none of above 3) Alo ...continues

Kinematics graph

Please give step by step answers. The four question that follow belong to the graph being described. The graph has velocit on the y axis in m/s and the x axis is time in seconds. The points given make the grph line. Points (0,20), (2,30), (4,40), (6,40), (8,0), and (10,-30). 1) What is the velocity of the object at t=2 ...continues