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
pav-90 [236]
2 years ago
13

calculate the work done in kilo joules in lifting a mass of 20kg at steady velocity through a vertical height of 20m

Physics
1 answer:
bulgar [2K]2 years ago
5 0

Answer:

\huge\boxed{\sf Work\ done = 4 kJ}

Explanation:

Since work done is in the form of potential energy, we will use the formula of potential energy here.

We know that,

<h3>P.E. = mgh </h3>

Where,

m = mass = 20 kg

g = acceleration due to gravity = 10 m/s²

h = vertical height = 20 m

So,

<h3>Work done = mgh</h3>

Work done = (20)(10)(20)

Work done = 4000 joules

Work done = 4 kJ

\rule[225]{225}{2}

You might be interested in
¿Cuál es la intensidad del campo eléctrico a una distancia de 2 m de una carga de -12μC? *
ahrayia [7]

Answer:

Una secadora de cabello tiene una resistencia de 10Ω al circular una corriente de 6 Amperes, si está conectado a una diferencia de potencial de 120 V, durante 18 minutos ¿Qué cantidUna secadora de cabello tiene una resistencia de 10Ω al circular una corriente de 6 Amperes, si está conectado a una diferencia de potencial de 120 V, durante 18 minutos ¿Qué cantidad de calor produce?, expresado en caloríasad de calor produce?, expresado en calorías

4 0
2 years ago
Name two specific contributions bohr made to our understanding of atomic structure
MAXImum [283]
Https://answers.yahoo.com/question/index?qid=20120227184717AAzEq8g
6 0
3 years ago
If you adjust the brightness of a light until it matches the intensity of sourness of the taste of a lemon, you are engaging in
Butoxors [25]
Unrestricted Submarine Warfare
6 0
3 years ago
Steam at 100°C is condensed into a 38.0 g aluminum calorimeter cup containing 280 g of water at 25.0°C. Determine the amount of
KonstantinChe [14]

Answer:

7.2g

Explanation:

From the expression of latent heat of steam, we have

Heat supplied by steam = Heat gain water + Heat gain by calorimeter

mathematically,

m_{s}c_{w} \alpha _{w} + m_{s}l=m_{w}c_{w} \alpha _{w} +m_{c}c_{c} \alpha c_{c}

L=specific latent heat of water(steam)=2268J/g

c_{w}=specific heat capacity=4.2J/gK

c_{c}=specific heat capacity of calorimeter =0.9J/gk

m_{w}=280g

m_{c}=38g

α=change in temperature

\alpha _{c}=(40-25)=15

\alpha _{w}=(40-25)=15

\alpha _{s}=(100-40)=60

Note: the temperature of the calorimeter is the temperature of it content.

From the equation, we can make m_{s} the subject of formula

m_{s}=\frac{m_{w}c_{w} \alpha +m_{c}c_{c}\alpha}{c_{w}\alpha +l}

Hence

m_{s}=\frac{(280*4.2*15) +(38*0.9*15)}{(4.2*60) +2268} \\m_{s}=\frac{18153}{2520}\\ m_{s}=7.2g

Hence the amount of steam needed is 7.2g

6 0
3 years ago
Please help with these questions
lord [1]
When do you gotta turn it in?
8 0
2 years ago
Other questions:
  • The _________ specifies the station that sent the frame.
    5·1 answer
  • How do similar (S-S or N-N) magnetic poles interact?
    8·2 answers
  • If the force of gravity between a book of mass 0.50 kg and a calculator of 0.100 kg is 1.5 × 10-10 N, how far apart are they?
    14·1 answer
  • Pressure can affect the density of<br><br> Solids<br> Liquids<br> Gases<br> Metals
    7·1 answer
  • What is meant by the statement "Motion is relativel"?
    14·1 answer
  • 50 POINTS!!!!!
    13·1 answer
  • What part of an atom is involved in electricity and magnetism?*
    15·2 answers
  • a trampoline launches a 50kg person 2m into the air. if the springs push with 1960N of force, how much displacement was there in
    14·2 answers
  • A child has a toy balloon with a volume of 1.80 L. The temperature of the balloon when it was filled was 20.ºC and the pressure
    11·1 answer
  • What does the model show?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!