CLASS—IX

Raghav applies a force of 6kgf to draw 4.8kg bucket of water from a well using a single fixed pulley. Assuming that all of the extra force a applied is to overcome frictional forces, calculate the force of friction, mechanical advantage and efficiency.

a metallic wire has a resistance of 1 ohm per meter

why speed of light increases with increase with temperature?

what is disadvantage of water having high specific heat capacity?

CLASS—IX

A. its velocity must be positive

B. its velocity must be negative

C. it must be slowing down

D. it must be speeding up

E. none of the above must be true

ans: E

....explain

Raghav applies a force of 6kgf to draw 4.8kg bucket of water from a well using a single fixed pulley. Assuming that all of the extra force a applied is to overcome frictional forces, calculate the force of friction, mechanical advantage and efficiency.

a metallic wire has a resistance of 1 ohm per meter

why speed of light increases with increase with temperature?

(a) Less than 2 ohms

(b) Equal to 4.4 ohms

(c) Equal to 7.33 ohms

(d) Equal to 6.75 ohms

what is disadvantage of water having high specific heat capacity?