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gaps along railroad tracks can be observed over time. How is this situation similar to concrete roads?
(Base on Physics :Heat and temperature *thermal expansion)
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- Collectible coins are sometimes plated with gold to enhance their beauty and value. Consider a commemorative quarter-dollar advertised for sale at 4.98. It has a diameter of 24.1 mm and a thickness of 1.78 mm. and it is completely covered with a layer of pure gold 0.180 m thick. The volume of the plating is equal to the thickness of the layer multiplied by the area to which it is applied. The patterns on the faces of the coin and the grooves on its edge have a negligible effect on its area. Assume the price of gold is 25.0 per gram, (a) Find the cost of the gold added to the coin, (b) Does the cost of the gold significantly enhance the value of the coin? Explain your answer.A new quilt is warmer than old one. Why?At the beach, you can get a sunburn while under the shade of an umbrella. What is your explanation?
- At the beach, you can get a sunburn while under the shade of an umbrella. Explain the statement?You stand on top of a skyscraper and drop a rubber ball from a height of 163 m. As the ball bounces off the floor it converts some of its energy into thermal energy -- it becomes warmer. Eventually, it stops bouncing and it has converted all the energy it initially had into thermal energy. How much has its temperature risen? (The specific heat of rubber is 2005 J/(kg*K).)A person is standing outdoors in the shade where the temperature is 33 °C. What is the radiant energy absorbed per second by his head when it is covered with hair? The surface area of the hair (assumed to be flat) is 170 cm2 and its emissivity is 0.85.
- If 0 0 8 M₁ 120° Mz in the figure = 55°, how aboutIs heat and light considered as a matter? Why? Why notWhat is the net heat current in radiation of an Ice cube at 0 °C if the surrounding air is at 20°C? The ice cube has sides of length 2.50 cm, the emissivity of ice is 0.96 and the Stefan-Boltzmann constant is o = 5.67 x 10-8 Watts/m2Kª. Is the heat flow out or into the ice cube, explain?
- In 1986, an enormous iceberg broke away from the Ross Ice Shelf in Antarctica. It was an approximately rectangular prism 160 km long, 40.0 km wide, and 250 m thick. (a) What is the mass of this iceberg, given that the density of ice is 917 kg/m3 ? (b) How much heat transfer (in joules) is needed to melt it? (c) How many years would it take sunlight alone to melt ice this thick, if the ice absorbs an average of 100 W/m2 , 12.00 h per day?You stand on top of a skyscraper and drop a rubber ball from a height of 163 m. As the ball bounces off the floor it converts some of its energy into thermal energy -- it becomes warmer. Eventually, it stops bouncing and it has converted all the energy it initially had into thermal energy. How much has its temperature risen? (The specific heat of rubber is 2005 J/(kg*K).) Explain why it is very unlikely that the rubber ball from the previous question will spontaneously jump back up onto the skyscraper when you heat it up.An object emits 30 Watts of power. If it were a perfect black body, other things are being equal, it would emit 90 Watts of radiant power. What is the emissivity of the object?