Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

ICSE Class 10 Answered

a crowbar of length 2.0m is used as a machine to lift a box of 100gf by placing the fulcrum ata distance 0.1m from the box calculate the velocity ratio and effort
Asked by pradipdhole | 11 Jun, 2019, 10:01: PM
answered-by-expert Expert Answer
velocity ratio = effort-arm-length / load-arm-length  = 1.9/0.1  = 19
 
( fulcrum is at 0.1 m from box, hence effort arm length = 0.1 m , since length of crow bar 2 m ,  (2m-0.1m) = 1.9 m is load arm length )
 
if ideal efficiency is 100%, then mechanical advantage equals velocity ratio, hence mechanical  advantage = 19.
 
( it is assumed that weight of the box is 100 kgf , 100gf given in the question  is too small weight )
 
mechanical advantage = load/effort ,  hence effort = load/19 = 100 kgf /19 = 5.26 kgf   
Answered by Thiyagarajan K | 11 Jun, 2019, 11:27: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
ICSE 10 - Physics
Name the phenomenon of light responsible for the Tyndall effect. Write an event where this phenomenon can be observed. 
Asked by anubhutiupadhaya | 04 Mar, 2024, 01:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
Assertion (A): In real and Ideal conditions, work done by a mass tied at the end of a string, rotating uniformly in a circle, is zero. Reason (R): Work done is never zero in vacuum conditions. (a) Both (A) and (R) are true and (R) is the correct explanation of (A). (b) Both (A) and (R) are true but (R) is not the correct explanation of (A). (c) (A) is true but (R) is false. (d) Both (A) and (R) are false.
Asked by navycuber2738 | 29 Feb, 2024, 02:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
What are mechanical waves  
Asked by vijayprabath7 | 28 Jan, 2024, 04:41: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
pls derive mgh in physics
Asked by foodonly742 | 02 Jan, 2024, 11:06: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
Explain Pulley
question image
Asked by krishnathakurt139 | 06 Dec, 2023, 09:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
1000 Newton force is applied for 5 second on a body of mass 10 kg kept at rest.Find the change of momentum and distance travelled by the body during that time.
Asked by ayanpal713143 | 27 Nov, 2023, 09:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
what amount of water at 40 degree celsius is to be mixed with 250 grams of ice at 10 - 10 degree Celsius so that equally premium temperature is 25 degree Celsius
Asked by imunilu786 | 29 Oct, 2023, 02:35: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
diff between centrifugal and centripetal forces... thank you
Asked by praggya.srivastava.g1972 | 13 Oct, 2023, 10:51: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
could you please make a sample paper ( with ans) for physics ch light , sound , force , spectrum , machine and
Asked by praggya.srivastava.g1972 | 11 Sep, 2023, 08:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Physics
how does a mobile phone's radiations affect a plant ? (if a mobile phone is kept in front of a plant for 24 hrs what will happen)
Asked by praggya.srivastava.g1972 | 10 Sep, 2023, 10:52: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×