What is the first law of thermodynamics for a system?
What will be an ideal response?
The first law of thermodynamics, in words, is heat minus work equals energy change of the system.
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Why did the solar nebula flatten into a disk?
A) The force of gravity pulled the material downward into a flat disk. B) It flattened as a natural consequence of collisions between particles in the nebula, changing random motions into more orderly ones. C) As the nebula cooled, the gas and dust settled onto a disk. D) The interstellar cloud from which the solar nebula formed was originally somewhat flat.
When an object is placed 118 cm from a thin diverging lens, its image is found to be 59 cm from the lens. The lens is removed, and replaced by a thin converging lens whose focal length has the same magnitude as the diverging lens
This second lens is at the original position of the first lens. Where is the image of the object now?
Rotational Kinetic Energy: A ball in the shape of a uniform spherical shell (like a soccer ball) of mass 1.5 kg and radius 15 cm rolls down a 35° incline that is 6.0 m high, measured vertically. The ball starts from rest, and there is enough friction on the incline to prevent slipping of the ball.(a) How fast is the ball moving forward when it reaches the bottom of the incline, and what is its angular speed at that instant?(b) If there were no friction on the incline, how fast would the ball be moving forward and what would be its angular speed at the bottom?
What will be an ideal response?
When tuning a radio to a particular station, you match the frequency of the internal electrical circuit with the frequency of the wanted radio station. What principle is being employed?
A) forced vibrations B) resonance C) beats D) reverberation E) wave interference