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A uniform meter scale is in equilibrium as shown in the diagram :
(i) Calculate the weight of the meter scale.
(ii) Which of the following options is correct to keep the ruler in equilibrium when 40 gf wt is shifted to 0 cm mark ?
F is shifted towards 0 cm
or
F is shifted towards 100 cm
Concept: Equilibrium of Bodies
Concept: Centre of Gravity
Clockwise moment produced by a force about a fulcrum is considered to be ______.
Concept: Moment (Turning Effect) of a Force or Torque
When this triangular lamina is suspended freely from any one vertex, what is the moment of force produced by its own weight in its rest position?
Concept: Centre of Gravity
The diagram shows wheel O pivoted at point A. Three equal forces F1, F2 and F3 act at point B on the wheel.
- Which force will produce maximum moment about A?
- Give a reason for your answer in (a).
Concept: Moment (Turning Effect) of a Force or Torque
A door lock is opened by turning the lever (handle) of length 0.2 m. If the moment of force produced is 1 Nm, then the minimum force required is ______.
Concept: Moment (Turning Effect) of a Force or Torque
When a stone tied to a string is rotated in a horizontal plane, the tension in the string provides ______ force necessary for circular motion.
Concept: Equilibrium of Bodies
A non uniform beam of weight 120 N pivoted at one end is shown in the diagram below. Calculate the value of F to keep the beam in equilibrium.
Concept: Equilibrium of Bodies
A hollow ice cream cone has height 6 cm.
- Where is the position of its center of gravity from the broad base?
- Will its position change when it is filled completely with honey? Write Yes or No.
Concept: Centre of Gravity
Why is a jack screw provided with a long arm?
Concept: Concept of Work
How is work done by a force measured when the force is in an angle to the direction of displacement?
Concept: Measurement of Work
Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m/s-1. Calculate the power exerted.
Concept: Concept of Power
Name a common device where a gear train is used
Concept: Concept of Work
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
Concept: Concept of Work
What is the work done by the moon when it revolves around the earth?
Concept: Concept of Work
Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.
Concept: Forms of Energy > Solar Energy
State the energy change in the following device while in use:
A loudspeaker
Concept: Forms of Energy > Solar Energy
State the energy change in the following device while in use:
A glowing electric bulb.
Concept: Forms of Energy > Solar Energy
What is nuclear energy?
Concept: Forms of Energy > Solar Energy
