Physics

posted by .

One of the most powerful cranes in the
world, operating in Switzerland, can slowly
raise a load of 6000 tonne to a height of 12 m.
(1 tonne = 1000 kg)
The acceleration of gravity is 9.81 m/s2 .
How much work is done by the crane?
Answer in units of MJ
I found it by using Work = mass* acceleration* distance
1) converted 6000 tones to kilograms and I got 6000000kg thus,
2) work = (6000000kg)*(9.81m/s^2)*(12m)=706320000J
3)Then I converted 706320000j to MJ
706320000/10^6=70632 MJ
002 (part 2 of 2) 5.0 points
If it takes 3 min to lift the load at constant velocity to this height, find the power developed
by the crane.
Answer in units of MW.
please help me I have tried it 3 times and it's wrong. Please explain so I can understand how to go about this problems.

• Physics -

Mass=6*10^3tons * 1*10^3kg/ton=6*10^6kg.

Work = F*h = mg*h.
Work = 6*10^6*9.81 * 12=706.3*10^6 J. =
706.3 MJ.

P = Work/T = 706.3MJ/180s. = 3.92 MJ/s.=
3.92 MW.

Respond to this Question

 First Name School Subject Your Answer

Similar Questions

1. Physics

A 4.00kg crate is slowly lifted to a height of 1.50 m.(a)How much work is done by the lifting force?
2. Physics

Hi Can someone check and advise on this potential energy of 2 tonne of water held 120m above a flood plain by a dam. potential energy = 2032 kg (2 Tonne) x 9.81 ms x 120m pe = 2392070.4 Joules Convert to kilojoules 2392070.4 / 1000 …
3. physics

A crane lifts 1 tonne of concrete through a height of 25 m. How much work does it do?
4. Physics. PLEASE HELP!!

NOTE: 1 MJ = 106J. One of the most powerful cranes in the world, operating in Switzerland, can slowly raise a load of 6000 tonne to a height of 8 m. (1 tonne = 1000 kg) The acceleration of gravity is 9.81 m/s2 . How much work is done …
5. Math

Calculate the mass of water in kg and tonne contained in a rectangular tank with the following dimensions: width of 3.2000 metres height of 2.000 metres length of 8.000 metres. (Round answers to 3 decimal places) Answers: l= 8.000 …
6. Maths / physics

Calculate the rest mass (In grams) of an object whose rest energy is equal to the energy released by a tonne of tnt the energy liberated by 1 g of tnt = 4kJ Rest energy = moc 2 1 tonne of tnt equals 10^6 x 4kJ = 4 x 10^6 kJ x (3.0^8)sqrd …
7. Physics matter and its properties

A circular metal column is to support a load of 500 Tonne and it must not compress more than 0.1 mm. The modulus of elasticity is 210 GPa. the column is 2 m long. Calculate the cross sectional area and the diameter. (0.467 m^2 and …
8. physics

A truck of mass 1.0 tonne moving at 4.0 m/s catches up and collides with a truck of mass 2.0 tonne moving at 3.0m/s in the same direction. The trucks become coupled together. Calculate their common velocity
9. physics

The throttle of an electric train is shut off at a speed of 48 km/h. The total mass of the train is 81 tonne and the combined resistance force is 90 newtons per tonne. Find how long it will take for the train to stop.
10. math

The farmer sells a 41.9915-tonne load to a buyer who takes a single scoop of tomatoes from a random spot in the load. If the sample has approximately 300 tomatoes and 92% are acceptable, how much is the load worth?

More Similar Questions
{"found_math": false, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 0, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 0, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0, "katex": 0, "math-container": 0, "wp-katex-eq": 0, "align": 0, "equation": 0, "x-ck12": 0, "texerror": 0, "url": "https://www.jiskha.com/display.cgi?id=1361891018", "fetch_time": 1503318376000000000, "content_mime_type": "text/html", "warc_filename": "crawl-data/CC-MAIN-2017-34/segments/1502886108268.39/warc/CC-MAIN-20170821114342-20170821134342-00619.warc.gz", "warc_record_offset": 943514223, "warc_record_length": 4599, "token_count": 982, "char_count": 3240, "score": 3.765625, "int_score": 4, "crawl": "CC-MAIN-2017-34", "snapshot_type": "latest", "language": "en", "language_score": 0.8559206128120422, "file_path": "/sailhome/yjruan/project/latent-lm/data/processed/finemath-4plus/finemath-4plus/train-00032-of-00064.parquet"}