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
Y_Kistochka [10]
3 years ago
13

How much work (in j) must be done to lift a stack of bricks, which has a mass of 400 kg, from the ground to a height of 3 m? (g

= 10 m/s2)?
Physics
1 answer:
svetoff [14.1K]3 years ago
6 0
Given: Mass m = 400 Kg;   Height h = 3 m;     g = 10 m/s²

Required:  Work = ?

Formula: Work = Force x distance  F = ma    a = g    F = mg

W = fd

W = mgh

W = (400 Kg)(10 m/s²)( 3 m)

W = 12,000 Kg.m²/s²

W = 12,000 J

You might be interested in
How long does creatine phosphate provide every
Tems11 [23]
Creatine phosphate can supply the energy needs of a working muscle at a very high rate, but only for about 8–10 seconds.
6 0
2 years ago
Explain why water boiling in a container stops<br>boiling momentarily when the lid is removed​
Dmitriy789 [7]

Answer:

It's because it tips over the threshold from nucleate boiling, which we can see, to convection boiling, which we can't. ... Even if the steam stayed in the pot, it would still stop boiling when you removed the heat. The steam and water in a liquid/vapour mixture are at the same temperature (100ºC).

Explanation:

8 0
3 years ago
An object of height 8.50 cm is placed 20.0 cm to the left of a converging lens with a focal length of 12.0 cm. Determine the ima
ddd [48]

The image distance is 33.3 cm while the image height is 14.2 cm.

<h3>What is a converging lens?</h3>

A converging lens will always have a positive focal length hence, we have to find the object distance as follows;

1/f = 1/v + 1/u

1/12 = 1/v + 1/20

1/v = 1/12 - 1/20

1/v = 0.08 - 0.05

v =33.3 cm

Now;

Magnification =  33.3 cm/20.0 cm =1.67

M = Image height/Object height

1.67 =  Image height/8.50 cm

Image height = 1.67  * 8.50 cm

Image height = 14.2 cm

Learn more about focal length:brainly.com/question/16188698

#SPJ1

5 0
1 year ago
Calculate the momentum of of a 1,5000 kg car traveling at 6 m/s
ANEK [815]

Answer: 90000 kgm/s

Explanation:

Given that,

Momentum of car = ?

Mass of car = 1,5000 kg

Velocity of car = 6 m/s

Recall that momentum is the product of mass of the moving object by its velocity

i.e Momentum = mass x velocity

Momentum = 15000kg x 6m/s

= 90000kgm/s

Thus, the momentum of the car is 90000 kgm/s

4 0
3 years ago
A toy train engine rests motionless on a track. One student begins pushing the engine to the right with a force of 2 newtons. At
Svetradugi [14.3K]
I think it’s B

Hope it helps
8 0
3 years ago
Other questions:
  • Liquid nitrogen boils at 77.2 k. what is this temperature in degrees celsius
    10·1 answer
  • Global climate could be greatly altered if the earth's energy budget were out of balance.
    12·2 answers
  • What happens when the vapor pressure of a liquid is equal to the external pressure?
    5·1 answer
  • Knowing that 1 inch is equal to 2.54 centimeters, convert 287 cm to inches.
    10·2 answers
  • By which method does heat travel from the sun to Earth? A. Conduction B. Convection C. Evaporation D. Radiation
    6·2 answers
  • The gravitational force exerted on a baseball is 2.24 N down. A pitcher throws the ball horizontally with velocity 17.0 m/s by u
    14·1 answer
  • In which type of chemical reaction is heat absorbed from the surroundings?
    12·2 answers
  • Hello:) how to do 3?:)
    7·1 answer
  • A car initially traveling at 21.4 m/s accelerates at a rate of 4.4 m/s2 for 7.5 seconds. What is the final velocity of the car?
    6·1 answer
  • A graph titled velocity versus time has horizontal axis time (seconds) and vertical axis velocity (meters per second). A line ru
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!