1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
gladu [14]
2 years ago
14

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]

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

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

diameter = 100 mm = 0.1 m

thick = 0.1 mm = 1 ×10^{-4} m

dynamic viscosity = 1.75 ×10^{-5} Ns/m²

air temperature = 15°C

to find out

time required after impact for a puck to lose 10%

solution

we know velocity varies here 0 to v

we consider here initial velocity = v

so final velocity = 0.9v

so change in velocity is du = v

and clearance dy = h

and shear stress acting on surface is here express as

= µ \frac{du}{dy}

so

= µ  \frac{v}{h}   ............1

put here value

= 1.75×10^{-5} × \frac{v}{10^{-4}}

= 0.175 v

and

area between air and puck is given by

Area = \frac{\pi }{4} d^{2}

area  =  \frac{\pi }{4} 0.1^{2}

area = 7.85 × \frac{v}{10^{-3}} m²

so

force on puck is express as

Force = × area

force = 0.175 v × 7.85 × 10^{-3}

force = 1.374 × 10^{-3} v    

and now apply newton second law

force = mass × acceleration

- force = mass \frac{dv}{dt}

- 1.374 × 10^{-3} v = 0.03 \frac{0.9v - v }{t}

t =  \frac{0.1 v * 0.03}{1.37*10^{-3} v}

time = 2.18

so time required after impact for a puck is 2.18 seconds

3 0
3 years ago
Use the drop-down menus to identify each labeled part of the diagram.
iren2701 [21]

Answer:

<u>A:cool fluid sinks</u>

<u>B:warm fluid rises</u>

<u>C:convection current</u>

Explanation:

Just took the assessment!!

3 0
3 years ago
Other questions:
  • What is the speed of a car in meters per second when it is moving at 100km/h?
    13·1 answer
  • A lever is placed on a fulcrum. A rock is placed on the right end of the lever and a downward (counterclockwise) force is applie
    10·1 answer
  • What other forces affect the soccer ball after the student's foot stops touching it?
    5·2 answers
  • The man who discovered that even individual light particles have wave characteristics was:
    9·2 answers
  • Do you think that nuclear fusion takes place in the atmospheres of stars? Why or why not?
    7·1 answer
  • How do scientists predict hurricanes?
    13·1 answer
  • A ringing bell sends sound waves in all<br> directions<br> places<br> sides
    5·1 answer
  • 17. A ball on the end of a string is
    11·1 answer
  • A car advertisement states that a certain car can accelerate from rest to 140 m/s in 7 seconds. Find the car’s average accelerat
    11·1 answer
  • 1.What is an object that appears fuzzy through a material that is?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!