Is a iron a conduction , raidition or convection

In the absence of air resistance, a ball of mass m is tossed upward to reach a height of 20 m. at the 10 m position, halfway up,

Mazyrski [523]

On the ball, there is mg of net force.

<h3>How would one describe air resistance?</h3>

Air exerts a force known as air resistance. The force works in the opposite direction of an object traveling through the air.
While a sports vehicle with a streamlined design will encounter reduced air resistance and experience less drag, the automobile will be able to move more quickly than a truck with a flat front.

<h3>What Causes Air Resistance?</h3>

Air resistance, also referred to as "drag," is a force brought on by air. When air specks collide with an object's front, it slows down.
The more air particles that impact the object and the larger its surface area, the more resistance it faces.

learn more about air resistance here

brainly.com/question/1385438

#SPJ4

5 0

2 years ago

Why does electrical current always flow from areas of negative charge to areas of positive charge?

dexar [7]

<span>Negative is attracted to positive. </span>

3 0

3 years ago

Read 2 more answers

When checking the charging system on a late-model vehicle: Technician A connects a scan tool to monitor the system voltage outpu

bearhunter [10]

Answer:

C) Both 1 and 2

Explanation:

The scan tool may include a bi-directional control that allows the technician to control the output of the alternator for testing purposes.

The Diagnostic Trouble Codes (DTCs), are used by automobile manufacturers to diagnose problems related to the vehicle.

The scan tool can also be used to monitor the output voltage of the vehicle to verify if the correct amount of voltage is supplied by the alternator.

Both Technicians A and B are correct because the steps they both take are necessary for the diagnosis of the vehicle.

5 0

3 years ago

Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 4 MPa, 500°C, and 80 m/s, and the exit

Delicious77 [7]

Answer:

a)23.4KW

b)12.11MW

c)1.155m^2

Explanation:

Hello!

To solve this problem follow the steps below

1. We will call 1 at the turbine entrance and 2 at the exit.

2. To calculate the change in kinetic energy, calculate the kinetic energy at the entrance and exit of the turbine and find the difference.

E=0.5mV^2

m=mass flow=12kg/s

E=kinetic energy

V=speed

solving

$E=(0.5)(12kg/s)(80m/S)^2-(0.5)(12kg/s)(50m/S)^2=23400W=23.4KW$

3. We find the enthalpies in states 1 and 2, and the density in the state 2 by thermodynamic tables

note: Through laboratory tests, thermodynamic tables were developed, these allow to know all the thermodynamic properties of a substance (entropy, enthalpy, pressure, specific volume, internal energy etc ..)

through prior knowledge of two other properties such as pressure and temperature.

h1=Enthalpy(Water;T=500C;P=4000kPa)

=3445KJ/kg

h2=Enthalpy(Water;x=0,92(quality);P=30kPa)=2438KJ/kg

density2=0.2078kg/m^3

4.

use the first law of thermodynamics that states that the energy entering the system is the same as the one that must go out, consider the flow energy, the work done and the kinetic energy

$mh1+0.5mV1^2=mh2+W+0.5mV2^2\\W=m(h1-h2)+0.5m(V1^2-V2^2)\\W=12(3445000-2438000)+0.5(12)(80^2-50^2)=12107400W=12.11MW$

5.

to find the speed at the exit of the turbine we remember that the mass flow is defined as the product between the velocity density and the cross-sectional area

m=(density)(A2)V2

$A2=\frac{m}{(density)(V2)} =\frac{12}{(0.2078)(50)}=1.155m^2$

7 0

3 years ago

As a professional teacher who has been assigned to teach science in an elementary school class design activities to teach source

Butoxors [25]

Answer:

For solar energy, I would show them how a magnifying glass works when exposed to the sun.

For wind energy, I would teach them how to make a paper windmill and explain how it works.

For the hydroelectric energy, I would have them make a plastic turbine and explain to them how to use it in rivers or streams.

For electromagnetic energy, I would tell them to rub a balloon until their hairs stand on end.

And for electricity, I would teach them how the other energy sources create electricity and what electricity works for in these times.

Explanation:

To explain something so complicated to a child is not as easy as it would be with a teenager or an adult.

To make the children learn about the forms of energy, I would use the nemotechnique rule, using short and easy-to-remember sentences and explaining with many examples about how to get each type of energy and its use, in addition to adding didactic, visual and auditory content, which are the most common types of learning in children.

8 0

3 years ago