Is the electric field constant or does it vary with time in dielectric materials?

1819

Which way do twin screw props on a boat rotate when propelling the boat forward?

962

X-Ray is avoided by using ?

1071

What is a thermal transformation?

1112

Does sunlight reflected off a mirror increase the temperature of the sun-rays?

1130

How does a sound wave travel in air?

1135

Giraffe in Arabic means "the highest of all." The height of a giraffe is an average of 5 m, its mass is about 800 kg and hooves is an area of approximately 625 cm2. Using a straw from a material nedeformabil a giraffe trying to drink water from a lake, not to condescend. What is the ratio of the minimum pressure to be applied giraffe, mouth, at the end paiului to drink water and pressure of giraffe on the ground. The density of water. g = 10 m/s2

2164

Who did first record the sound?

1082

assuming friction is negligible, if a lever has a mechanical advantage of 5, how much effort in newtons is needed to lift a 10 newton load?

980

Explain the difference between the atomic theory and the kinetic theory?

927

What is the difference between intrinsic and extrinsic semiconductors?

1014

Explain the difference between collector & emitter of transistor, even though material used for both same?

1044

Tell me how do you calculate shaft power?

1039

How many types of wave motions are there?

1131

1.when a diode has its maximum resistance? 2.is ohm's applicable for an ac circuit?  

1883