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While you are walking across a horizontal floor at a constant velocity, the force your hand exerts on the bag does no work.
However, when you ascend an escalator, the force does perform work on the bag.
Why? To do work is to change the energy of an object. In this case we have either kinetic energy, or gravitational potential energy.
The first case we are walking on a horizontal floor, there is no change in height, thus no change in potential energy. We are also moving at a constant speed, thus no change in kinetic energy. If we sped up, or slowed down, then we would do work.
In the second case, we are ascending an escelator, and changing the height. This changes the gravitational potential energy, and thus does work.
What else can I help you with?
On a V-t graph how does constant acceleration appear?
On a graph of speed versus time, where time is plotted along the horizontal (X) axis and speed along the vertical (Y) axis: -- constant speed (zero acceleration) produces a straight, horizontal line; -- constant acceleration produces a straight, sloped line; the slope of the line is equal to the acceleration; -- if the acceleration is positive, the line slopes up to the right (speed increases as time increases); -- if the acceleration is negative, the line slopes down to the right (speed decreases as time increases).
The graph of acceleration vs time for something going a constant positive velocity has what kind of characteristics?
The graph of acceleration vs time for something going at a constant positive velocity would be a horizontal line at zero on the acceleration axis. This is because there is no change in velocity, so the acceleration is constant and equal to zero.
What graph of acceleration vs time constant velocity?
When the acceleration of a particle is constant, the velocity will be increasing at a constant rate. This means that the velocity versus time graph will appear with a straight line "slanting up to the right" in the first quadrant. With time on the x-axis and velocity of the y-axis, as time increases, velocity will increase. That means the line will have a positive slope. The higher the (constant) acceleration, the greater the slope of the line. If we take just one example and mark equal units off on our axes, and then assign seconds along the x-axis and meters per second along the y-axis, we can plot a graph for an acceleration of, say, one meter per second per second. Start at (0,0) and at the end of one second, the velocity will be one m/sec. That point will be (1,1). After another second, the velocity will be 2 m/sec owing to that 1m/sec2 rate of acceleration, and that point will be (2,2). The slope of the line is 1, which is the rate of acceleration.
What characterizes constant velocity motion on a position time graph?
A straight line with a constant slope. But the reverse is not true. A straight line with a constant slope only means constant speed in the radial direction. The velocity may have components at right angles to the radial direction that are changing.
Why does the horizontal scale of a Mercator projection increase with latitude?
In the Mercator projection, the horizontal scale increases with latitude to preserve angles and maintain straight lines for navigation purposes. This distortion in scale towards the poles helps with navigation by allowing lines of constant bearing (rhumb lines) to appear as straight lines on the map.
What is the escalator that doesn't have stairs called?
a slide Well for now lets just call it the straight escalator that doees not have stairs or the straight escalator
How does a velocity-time graph show constant speed?
as a horizontal straight line
What does constant speed appear as on a V-t graph?
On a graph of velocity and time, a constant speed would appear as a straight horizontal line.
If a graph shows time on the horizontal axis and speed on the vertical axis a straight horizontal line across the graph would indicate?
constant speed
If a gragh shows time on the horizontal axis and speed on the vertical axis a straight horizontal line across the gragh would indicate what?
A constant speed.
If a graph shows time on the horizonal axis and speed on the vertical axis a straight horizontal line across the graph would indicate?
The straight horizontal line would indicate constant speed.(NOT constant velocity. The velocity could very well be changing, but the graphdoesn't tell you anything about the direction of the motion, only that the speedis constant.)
A graph has time on the horizontal axis and speed on the vertical axis a straight horizontal line across the graph would indicate what?
The given speed is constant for the given period
In a graph showing time on the horizontal axis and speed on the vertical axis What would a straight horizontal line indicate?
The line would indicate motion at a constant speed.
If a graph shows time on the horizontal axis and speed on a vertical axis a straight horizontal line across the graph would indicate?
Constant speed ... zero acceleration.
What does it mean when a distance-time graph is straight line?
It means that the object in question is moving at a constant speed.If the graph is a straight horizontal line, then the speed is zero.
If a graph shows time on the horizontal axis and speed on the vertical axis straight horizontal line across the graph would indicate what?
The straight horizontal line on the graph says: "Whatever time you look at, the speed is always the same". This is the graph of an object moving with constant speed.
What kind of simple machine is an escalator?
The escalator is a type of inclined plane, where motion is at an angle instead of straight up as in an elevator.
