The second law of leads to conclude that A) the total energy in the universe in
ID: 3163689 • Letter: T
Question
The second law of leads to conclude that A) the total energy in the universe in decreasing with time. B) the total energy of the universe is constant. C) in the universe is increasing with the passage of time. D) It is theoretically impossible to convert work into heat with 100% efficiency. E) the total energy in the universe in increasing with time. Is it possible to transfer heat from a hot reservoir to a cold reservoir? A) Year this will happen naturally. B) Theoretically yes, but it hasn't been accomplished yet. C) Yes, but work have to be done. D) No this is forbidden by the second law of 8) As you walk away from a vertical plane mirror, your image in the mirror. A) may or may not decrease in height, depending on where the observer is B) is a real image, no matter how far you are from the mirror. C) change from being a virtual image real image as you pass the focal point. D) is always the same height. E) decreases in height. Suppose you place your face in front of a concave mirror. Which one of the following statements is correct? A) If you position yourself between the center of and the focal point of the mirror, you will not be able to see a sharp image of your face. B) Your image will always be inverted. C) Your image will be diminished be formed. D) No matter where you place yourself a real image will be formed. E) None of these statements are true. A ray of goes from one transparent material into another, as shown in the figure. What can you conclude about the indices of refraction of these two materials? A 20 kg block of aluminum at 50 degree C is dropped into 5.0 kg of water at 20 degree C and the temperature is allowed to stabilize. What is the total change in entropy during this process, assuming no heat is exchanged with the environment? The specific heat of aluminum is 910 J/(kg K) and the specific heat of water is 4190 J/(kg K)Explanation / Answer
The image from plane mirror is always virtual.So, you just eliminate the answers in option(B) and (C).
For a plane mirror the object and image distances are equal and opposite.
Therefore magnification m = image distance / object distance
= 1 Since they are equal
we know m = height of image / height of object
1= height of image / height of object
i.e., height of image = height of object
Therefore option(D) is correct