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1. Do you remember my demonstration of radiative transfer of thermal energy? I shone a beam of light from a lamp onto a "weathervane-like" contraption and instantly, the vanes began revolving as if by magic. I explained that the hot lamp had sent waves of energy to the vanes penetrating through the vacuum in the bulb where the vanes were housed. It was this radiative energy that caused the conditions for the vanes to move. I should also have stated that all objects send out radiative energy and that if I had placed the contraption in bright sunlight the vanes would have moved too. The natural question then arises as to why the lamp and the sun can achieve that but that we who are also emitting radiative energy cannot. For a half (1/2) course point, give me the answer to that question with a full explanation.
2. Explain through physical concepts why the following are "words of wisdom"
3. You and a friend are watching a pool-shark showing off his prowess at billiards. In one demonstration, the pool-shark placed two billiard balls, one red and the other white, near each other on the table, then fires off the red ball so that it strikes one side of the table (A), then an adjacent second side (B), followed by the next adjacent third side (C) before colliding with the white ball. Your friend says she knows how she can do the same trick, at least in theory. She picks up a piece of paper, and then sketches a rectangle to represent the billiard table. She asks you to insert two small circles to represent the balls anywhere on the table. Taking the paper back from you and using a pencil and a ruler, she then draws the "complete trajectory of the red ball" as she would launch it so as to repeat the pool-shark's feat. If the drawing below is what you handed your friend, can you repeat what she did and show the trajectory she drew?
A marble is projected up along a 14 ° incline track at an initial speed of 2.2m/s and then coasts without friction. How long does it take for the marble to come to rest
What is the speed of the second asteroid? Now suppose that the first and second asteroids carry charges of 3.68 C and -3.68 C, respectively. How fast would the second asteroid have to be moving in order to occupy the same circular orbit as before?
Consider the following figure. (The four charges are at the corners of a square. Take q = 1.08 µC and Q = 2.30 µC.) In the figure, what are the magnitude and direction of the resultant force on q1? (Take q1 as the origin of the coordinate system and..
A 53.0-kg crate rests on a level floor at a shipping dock. What horizontal pushing force is required to slide the crate across the dock at a constant speed
q. a a diamond is underwater. a light ray enters one face of the diamond and after that travels at an angle of 30
Engineers have developed a bathyscaph that can reach ocean depths of 5.3 mi. If the density of seawater is about 1030 kg/m3, what is the absolute pressure at that depth? The acceleration of gravity is 9.8 m/s2 .
A shopper pushes a cart 39 m south down one aisle and then turns 90.0° west and moves 22 m. He then makes another 90.0° turn and moves 14 m.
you have a variable capacitor ranging from 5.9 pf to 9.9 pf . what inductor should be used with this capacitor in an fm
A car travels a distance of 280 m by accelerating from rest at 2.00 m/s2 for 7.00 s and then coasting at constant speed the rest of the way. How long does the trip take
A 1000N force stretches a wire by 4.0mm . A:A second wire of the same material is twice as long and has twice the diameter. How much force is needed to stretch it by 1.0 mm? B:A third wire of the same material is twice as long as the first and has..
The coefficient of kinetic friction between rubber and dry concrete is typically 0.650. Illustrate w hat happened to the car's original kinetic energy?
A 2000-kg car accelerates uniformly from rest to 30 m/s in a time of 20 s. What is the net force acting on the car
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