This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A roofer lifts supplies a height of 20. m with a hand-operated winch. How long would it take him to ... (Read 76 times)

arivle123

  • Hero Member
  • *****
  • Posts: 569
on: Jul 27, 2018
A roofer lifts supplies a height of 20. m with a hand-operated winch. How long would it take him to lift a 200. kg load, if the winch has an efficiency of 90, and the rate at which the winch can do work is 0.80 hp?
 
  What will be an ideal response?

Question 2

The Earth is divided into 24 time zones, in each of which local time differs by 1 hour. At 45 N latitude, what is the width of a time zone? (The Earth's radius is 6370 km.
 
  45 N latitude is about as far North as Portland, Oregon, and is halfway between the equator and the North pole.)


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

morganmarie791

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 27, 2018
Answer to Question 1

73. seconds

Answer to Question 2

1179 km


arivle123

  • Hero Member
  • *****
  • Posts: 569
Reply #2 on: Jul 27, 2018
Thank you!


morganmarie791

  • Sr. Member
  • ****
  • Posts: 336
Reply #3 on: Jul 27, 2018
Always glad to help...


« previous next »
 

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Parts of the Hand Used in Palpation; Palmar Surface Parts of the Hand Used in Palpation; Palmar Surface
Parts of the Hand Used in Palpation; Ulnar Surface Parts of the Hand Used in Palpation; Ulnar Surface
Muscle Strength of the Hand Grasp Muscle Strength of the Hand Grasp
The features found in a long bone. The features found in a long bone.
The tools necessary to adjust the valves on an engine with adjustable rocker arms include basic hand ... The tools necessary to adjust the valves on an engine with adjustable rocker arms include basic hand ...
One-handed kneading. Tissues are lifted with the whole hand in firm contact. One-handed kneading. Tissues are lifted with the whole hand in firm contact.
Video: Molecules, Membrane Permeability and Structure

For a complete list of videos, visit our video library