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Windmill- Wind energy - Mechanical energy- Electrical energy.
Flashlight- Chemical energy- Heat and light energy.
Microwave- Electrical- Thermal energy.
Firecrackers- Chemical- Heat, light and sound.
Bicycle- Muscular energy- Kinetic energy
Battery- Chemical- Electrical energy
Electrical- Thermal
Microwave
Chemical- Thermal
Burning of coal
Electrical- Mechanical
Electric motor
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<span>A ray traveling parallel to the principal axis of a concave mirror will be reflected back so that it passes through the focal point. Any ray that is parallel will be reflected inward towards the center of the mirror.</span>
The flow will be laminar if Reynold's number is less than 2000.
Use the Reynold's formula and rearrange to calculate velocity of water in the pipe.
Where, is velocity of the fluid, is the diameter of pipe, and is the kinematic viscosity i.e. for water at 288.7 K from Appendix.
So, velocity is:
The flow rate <em>Q</em>:
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Where A is the area of cross section of pipe.
The time taken to fill is:
Where V is the capacity of the tank.
Answer: 450 mph
Explanation: the immence gravity is stable enough to pull a large rock around the sun because 42