About 10% of the power of a 100W light bulb is converted to a visible radiation. What is the average intensity of visible radiation. at a distance of 10 m?

About 10% of the power of a 100W light bulb is converted to a visible radiation. What is the average intensity of visible radiation. at a distance of 1m from the bulb?

A body constrained to move in y directions is sunjected to a force F= (-2hati+15hatj+6hatk) N. What is the work doen by the force in moving through a distance of 10 m along the y-axis?

The position of an object moving along x-axis is given by x = a+ bt^2 , where a = 10m, b = 3 ms^-2 , and 't' is measured in second. What is the average velocity between t = 2s and t = 4s?

In deriving Bernoulli’s equation, we equated the work done on the fluid in the tube to its change in the potential and kinetic energy, (a) What is the largest average velocity of blood flow in an artery of diameter 2 xx10^-3 m if the flow must remain laminar? (b) Do the dissipative forces become more important as the fluid velocity increases? Discuss qualitatively.

The Marina trench is located in the Pacific Ocean, and at one place it is nearly eleven km beneath the surface of water. The water pressure at the bottom of the trench is about 1.1 xx 10^8 Pa. A steel ball of initial volume 0.32 m3 is dropped into the ocean and falls to the bottom of the trench. What is the change in the volume of the ball when it reaches to the bottom?

A family uses 8 kW of power, (a) Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW? (b) Compare this area to that of the roof of a typical house.

A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g= 10 m//s^2 , find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone?