Help plsss i need #1

Physics

1 answer:

DENIUS [597]2 years ago

6 0

Speed is (distance covered) divided by (time to cover the distance).

"Faster" means he covered more distance in less time.

On a graph of distance/time, the speed is the slope of the line,
because the slope of the line is just

(change in distance) divided by (change in time) .

In 'A', the runner went to the middle of the track (20 yards)
before the race started. Then, when the coach fired the pistol,
he took 4 seconds to run the last half of the track.
The slope is (20 yards) / (4 seconds) = 5 yards per second.

In 'B', the runner started at the starting line (zero distance), and when the
race started, he ran 30 yards in 4 seconds.
The slope is (30 yards) / (4 seconds) = 7.5 yards per second.

In 'C', the distance doesn't change at all. The runner went to the 40-yards
place before anybody started running, and just stayed there.
The slope is (zero) / (4 seconds). That's zero yards per second.
The runner is not running at all. He's just standing there, watching
the other runners run toward him.

In 'D', the runner went to the 20-yard mark before the race started,
just like 'A' did. When the pistol fired and the clock started, 'A' and 'D'
were both standing there, and started running.
'D' only ran 10 yards in the whole 4 seconds.
'B' got there at the same time that 'D' did, but 'B' ran 40 yards,
and 'D' only ran 10 yards.
The slope of 'D' is (10 yards) / (4 seconds) = 2.5 yards per second.

Graph 'B' is the steepest line, and that means the fastest speed.

You might be interested in

In 3 meters a person running 0.5 m/s accelerates 1.2 m/s 2. How fast were they going afterward? Choose the right equation for th

Feliz [49]

Answer:

2.72 m/s

Explanation:

In 3 meters a person running 0.5 m/s accelerates 1.2 m/s².

It means,

Distance, s = 3 m

Initial velocity, u = 0.5 m/s

Acceleration, a = 1.2 m/s²

We need to find the final velocity of the person. Using equation of motion to find it as follows :

$v^2-u^2=2as\\\\v^2=2as+u^2\\\\v^2=2\times 1.2\times 3+(0.5)^2\\\\v=2.72\ m/s$

So, the final velocity of the person is 2.72 m/s.

7 0

2 years ago

A 50 N girl climbs the flight of stairs in 3 seconds. How much work does she

kvv77 [185]

She uses 0 power because she simply has no gas left. She used all of it getting a 50 pc McDonald’s nugget with a side of ranch and a medium fry and a large water.

7 0

3 years ago

Based on illustrations of magnetic field lines, where could an object be placed so it would not experience a magnetic force

tiny-mole [99]

Halfway between the like poles of two magnets, because the field lines bend away and do not enter this area.

How does a magnetic field diagram show where the field is strongest?

The magnetic field lines do not ever cross.
The lines include arrowheads to indicate the direction of the force exerted by a magnetic north pole.
The closer the lines are to the poles, the stronger the magnetic field (thus the magnetic field from a bar magnet is highest closest to the poles).

Where is magnetic field the strongest and weakest on a magnet?

The bar magnet's magnetic field is strongest at its core and weakest between its two poles.
The magnetic field lines are densest immediately outside the bar magnet and least dense in the core.

Which two locations on the magnet would have the greatest attractive forces?

Inside the magnet itself, the field lines run from the south pole to the north pole.
The magnetic field is strongest in areas of greatest density of magnetic field lines, or areas of the greatest magnetic flux density.

Learn more about magnetic field

brainly.com/question/11514007

#SPJ4

4 0

1 year ago

An air hockey game has a puck of mass 30 grams and a diameter of 100 mm. The air film under the puck is 0.1 mm thick. Calculate

OverLord2011 [107]

Answer:

time required after impact for a puck is 2.18 seconds

Explanation:

given data

mass = 30 g = 0.03 kg