हिंदी

A Boy Does Work When He Pushes Against a Brick Wall. (Yes/No). - Physics

Advertisements
Advertisements

प्रश्न

A boy does work when he pushes against a brick wall. (yes/no).

एक शब्द/वाक्यांश उत्तर

उत्तर

Yes

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 1: Force, Work, Energy and Power - Exercise 1.4 i [पृष्ठ ३७]

APPEARS IN

फ्रैंक Physics - Part 2 [English] Class 10 ICSE
अध्याय 1 Force, Work, Energy and Power
Exercise 1.4 i | Q 2 | पृष्ठ ३७

संबंधित प्रश्न

A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?


It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the Work done.


Name the forms of energy which a wound-up watch spring possesses.


A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:

The loss in potential energy of the body, 


A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.


Is work a scalar or a vector quantity?


How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?


A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?


Choose one or more correct alternatives.

Joule is the unit of ______.

  1. force
  2. work
  3. power
  4. energy

A uniform circular motion is an accelerated motion. Justify it.


A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?


Is power a scalar quantity?


Can work done be zero even if force acts on the body?


A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i)    work done by machine,
(ii)    power at which the machine works.


Name the type of energy possessed by a body due to a change in configuration.

Can we destroy every energy associated with a body?

Define the term work. Name the CGS and SI unit of work.


Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction


State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.


A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×