Calculate the efficiency of a hairdryer that has a total power input of 2000W and a useful power output of 1200W.

Answers

Answer 1
Answer would be 40 w

Related Questions

Helppp!!!!! Please!!
A 0.144 kg baseball approaches a batter with a speed of 20m/s . The batter lines the ball directly back to the pitcher with a speed of 30m/s . Find the impulse exerted on the ball . If the bat and ball were in contact for 0.012 sec , find the average force exerted on the ball by the bat????

Answers

Answer:

Can you help me in mathematics

Element Type of ion formed in a chemical reaction
Phase at room

temperature

Reactivity
W


positive

solid highly reactive
X


does not form ions

gas non-reactive
Y


negative

gas highly reactive
Z positive liquid


somewhat reactive



Using your knowledge of periodic properties and trends, how would these elements BEST be classified and why?

A.
Elements W and Z are nonmetals, Elements X and Y are metals, but Element Y is in Group 1 (alkali metal).

B.
Elements W and Z are metals, Elements X and Y are nonmetals, but Element Y is in Group 18 (noble gas).

C.
Elements W and Z are metals, Elements X and Y are nonmetals, but Element X is in Group 18 (noble gas).

D.
Elements W and Z are nonmetals, but Element W is in Group 17 (halogen). Elements X and Y are metals.

Answers

Answer:C

Explanation:

A 3500 N is force is applied to a spring that has a spring of constant of k= 14000 N/m. How far from equilibrium will the spring be displaced?

Answers

Answer:

the spring be displaced by 25.0 cm

Explanation:

The computation is shown below:

As we know that

F= -K × x

So,

[tex]x = \frac{-F}{K}[/tex]

Now  

[tex]x = \frac{-3500}{14000} \\\\[/tex]

= -0.250m

= 25.0 cm

Hence, the spring be displaced by 25.0 cm

3. Which of the following is determined by the
force of gravity?

A weight
B momentum
C mass
D distance

Answers

Answer:

A) weight is determined by the force of gravity.

Answer:

A weight

Explanation:

The answer is weight. That's why someone would weigh more on a different planet, because the planet would have a higher/lower force of gravity.

A force of 1200N is creating a pressure of 60Pa on a surface. Calculate the area of the surface.

Answers

Answer: 20 squared units

Explanation:

Area = Force / Pressure

Explain the different types of energy in a working wind turbine

Answers

Answer:

A wind turbine converts the kinetic energy of the wind into mechanical power.  

The wind moves the turbine and the turbine produce energy.

How does an increase in thermal energy affect the kinetic energy of the particles in each state of matter

Answers

Explanation:

when there is an increase in thermal energy, the kinetic energy if the matter increases as well.

pls help, i really dw fail :(​

Answers

Answer:

Using the Newton equation

V²=U² +2as

Given; V=9.2m/s U = 0m/s( because it starts from rest)

S=26.2m.

9.2²=0²+2(26.2)a

a =9.2²/2(26.2)

a=84.6/52.4

a=1.60m/s²

Answer:

2.A

3.D

Explanation:

HOPE THIS HELPS!! :)

What is the total energy of a system with KE = 1368 J and a PE = 5782J? Express your answer in kJ.

Answers

Answer:

7.150 KJ

Explanation:

The total energy of a system is the sum of the potential and kinetic energy in the system. According to this question, the kinetic energy (KE) = 1368 J and a potential energy (PE) = 5782J.

Total energy of the system will be PE + KE as follows;

1368J + 5782J

= 7150J

However, the question demanded that the answer be in kJ (kilojoules), which is higher than the joules.

Since 1kJ = 1000J

7150J = 7150/1000

= 7.150kJ

You and your 3 friends are driving down the road. All the wheels go flat at the exact same time, that's not good. You have to use a 2,100 N force to push the car 4 meters to the side of the road. How much work did you do on the car?

Answers

Answer:

Workdone = 8400 Nm

Explanation:

Given the following data;

Force = 2100 N

Distance = 4 meters

To find the work done;

Workdone = force * distance

Workdone = 2100 * 4

Workdone = 8400 Nm

Therefore, the amount of work done on the car is 8400 Newton meters.

The asteroid has an estimated mass of 4000 kg and an orbital speed of 10 m/s. Determine the amount of kinetic energy of the asteroid. *

Answers

Answer:

40,000J

Explanation:

If a wave vibrates back and forth 12 times each second, what is period of the wave?

Answers

Answer:

I think it might be 9 hz but not 100% shore though

Explanation:

name one material through which continuous flow of charge can be produced from chemical energy​

Answers

Answer:

Battery.

Explanation:

A battery is a device that stores chemical energy, and converts it to electricity. This is known as electrochemistry and the system that underpins a battery is called an electrochemical cell. A battery can be made up of one or several (like in Volta's original pile) electrochemical cells

In which beaker were the particles moving the most slowly?
O A. Beaker C: 15°C
B. Beaker D: 18°C
C. Beaker B: 9°C
O D. Beaker A: 3°C

Answers

Answer:

It might be wrong but d? i think

Answer:

B. Beaker D: 18°C

Explanation:

Test approved

As Clinton walks he pushes his shoe against the track.
Which of the following best describes the reaction force to Clinton's shoe pushing against the track?
OA. The track pushes back on Clinton's shoe with the same force.
ОВ.
The track pushes in the same direction as Clinton's shoe with the same force.
OC. The track pushes against gravity with the same force.

The track pushes in a different direction with a different force.

Answers

Answer:A:The track pushes back on Clinton's shoe with the same force.

Explanation:According to Newton's third law of motion, for every action force there is an equal and opposite reaction force. In this case, the action force is Clinton's shoe pushing on the track. As this happens, there is an equal and opposite reaction force in which the track pushes back on Clinton's shoe with the same force.

What force is necessary to give a 1000 kg rocket an acceleration of 150
m/s2?

Answers

Answer:

150,000N

Explanation:

Force=Mass*Acceleration

F=ma

Mass of the rocket=1000Kg

Acceleration=150 m/s²

Force=1000*150=150,000kgm/s²=150,000N

who can teach me phsics​

Answers

A physics teacher with a certification

Which of the following describes a reference point?
A. The location of an object before its motion begins
B. The center point of a grid
C. The point at which the direction of motion changes
D. The position of an object after its motion has stopped

Answers

The best answer is A.

Imagine you are looking out a car window and you see a tree. A few seconds later you do not see the tree where it was. You have used the tree as a reference point to know that the car is moving.

An arrow that is pulled back by a bow has which type of energy?

Answers

Answer:

Kinetic energy

Explanation:

Kinetic energy is the energy of motion, and the arrow is in motion.

An arrow that is pulled back by a bow has POTENTIAL ENERGY and ready for motion or kinetic energy.

PLEASE HELP ASAP!!
Select the correct answer.

According to this map, which county in Florida is most in need of safe rooms and hurricane ties?




A.

Hillsborough

B.

Jefferson

C.

Palm Beach

D.

Miami-Dade

Answers

Answer:

I think it's Miami-Dade

Explanation:

i hope this helps

Answer:

it is miami-dade!

Explanation:

so by the shape look at this what will the time acceleration speed or velocity be in a beyblade what is the average if the beyblade spins for atleast 45 seconds and the beyblade weighs 55 grams what is the speed or acceleration of the beyblade?

Answers

Answer:

the answer is 1.09 speed

Answer:

2.00

Explanation:

Which type of earthquake waves are responsible for most of the damage caused by an earthquake? Why?
please helppppp its due tomorrow

Answers

Answer:

Surface waves travel along the surface. There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake.

Answer:

surface waves

Explanation:

they have the strongest vibration and can cause the most damage

32. Increasing the amplitude of a sound wave produces a
sound with
1. lower speed
2. higher pitch
3: shorter wavelength
4. greater loudness

Answers

Answer:

4

Explanation:

because amplitude of a sound wave is related to loudness of the sound, so the higher the amplitude, the louder the sound

hope this helps

8. Where does ½ to ⅓ of the ocean pollution come from?

Answers

Answer:

The majority of pollutants that make their way into the ocean come from human activities along the coastlines and far inland. One of the biggest sources of pollution is nonpoint source pollution, which occurs as a result of runoff.

Which of these actions would increase heat transfer between two objects?

establishing their thermal equilibrium
increasing the area of their contact
using objects with similar specific heats
reducing the time of their contact

Answers

Answer:

b

Explanation:

increasing the area of their contact.

BTS ARMY

Answer: B.) increasing the area of their contact

Explanation: i hope this helps :)

How are speed and velocity alike?

A. They both include the total distance traveled.
B.They both require a reference point.
C. They both describe a rate of motion.
D. They both include the direction of motion.

Answers

Answer:

c

Explanation:

I can fly but have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?

Answers

cloud?? thats prob wrong lol

Answer:

a shadow a cloud i dont really know

Motion maps for two objects, Y and Z, are shown.
Y →
Z
x
How many seconds does Object Z start before Object Y?
2.
03
04
5

Answers

Answer:

i can't see the map plzz send the map

Answer:

its 3

Explanation:

I just took test

Which can support life? Carbon, silicon, or both?

Answers

Answer:

both

Explanation:

Silicon

Explanation:

The chemical element of atomic number 14, a nonmetal with semiconducting properties, used in making electronic circuits. Pure silicon exists in a shiny dark gray crystalline form and as an amorphous powder

PLEASE HELLP ILL GIVE BrAINLY AND HEART

you are visiting a town that is in the middle of a large continent. How would you expect the ocean currents to effect the climate in the town?

A ) More Thunderstorms
B ) Cooler Temperatures
C ) Warmer Temperatures
D ) There is little effect on the town's climate

Answers

Answer:

D

Explanation:

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