4 0.15 m -0.30 B 0.36 m 3114 N A light rod which is suspended by a rope as shown in the figure. The ends of the rod are in contact with smooth vertical walls. If L= 0.25 m, determine the reactions at A and E.
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- reaches the ground with an intensity of about 1.0kW/m2 . A sunbather has a body surface area of 0.8 m2 facing the sun while reclining on a beach chair on a clear day. (a) how much energy from direct sunlight reaches the sunbather’s skin per second? (b) What pressure does the sunlight exert if it is absorbed?Calculate the linear density (in units of atoms/nm) along the [101][101] direction in copper.My physics class has turned to online due to the COVID-19 and I am having trouble with some of the word problems my teacher gave me to work on. She presented me with: I am contemplating a career change. If I had 500g of stolen gold jewelry, how much energy would I have to add to it to melt it (so that it was not longer recognizable)? Pretend that it is pure gold. Would you be able to show me how to accomplish this problem so I can see the steps? Thank you for your time. John Payton
- Carry out the following unit conversions. a) 82 μg to mg b) 6.73 × 10 − 4 mm to nm c) 1.37 × 106nA to mA d) 4.8 × 1018 mW to GWEstimate the power radiated by (a) a basketball at 20°C and (b) the human body (assume a temperature of 37°C).Two long parallel 20-cm-diameter cylinders are located 30 cm apart from each other. Both cylinders are black, and are maintained at temperatures 425 K and 275 K. The surroundings can be treated as a blackbody at 300 K. For a 1-mlong section of the cylinders, determine the rates of radiation heat transfer between the cylinders and between the hot cylinder and the surroundings.
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- Express your understanding of filters by answering the following questions. Choose the best answer(s) from the Color Table. u. A yellow object is illuminated with yellow light and viewed through a green filter. The object will appear _____. v. A yellow object is illuminated with green light and viewed through a yellow filter. The object will appear _____. w. A yellow object is illuminated with green light and viewed through a green filter. The object will appear _____. x. A yellow object is illuminated with green light and viewed through a red filter. The object will appear _____. y. A yellow object is illuminated with green light and viewed through a cyan filter. The object will appear _____. z. A red object is illuminated with yellow light and viewed through a cyan filter. The object will appear _____.You are working in a factory that produces long bars of copper with a square cross section. In one section of the production process, the bars must slide down a plane inclined at an angle θ = 21.0° to the horizontal. It has been found that the bars travel with too high a speed and become dented or bent when they arrive at the bottom of the plane and must be discarded. In order to prevent this waste, you devise a way to deliver the bars at the bottom of the plane at a lower speed. You replace the inclined plane with a pair of parallel metal rails, shown, separated by a distance ℓ = 2.00 m. The smooth bars of mass m = 1.00 kg will slide down the smooth rails, with the length of the bar always perpendicular to the rails. The rails are immersed in a magnetic field of magnitude B, and a resistor of resistance R = 1.00 Ω is connected between the upper ends of the rails. Determine the magnetic field necessary in your device so that the bars will arrive at the bottom of the plane with a…In relation to incoming radiation, which surface would receive the most heat? a. the surface that is perpendicular to the radiation b. the surface that is parallel to the radiation c. the surface that is angled towards the radiation d. the surface that is angled away from the radiation
