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1. What would be the final temperature of a mixture of 50 g of 20°C water and 50 g of 40°C water?
2. Suppose that a brass rod 1.0 m long expands 0.5 cm when its temperature is increased a certain amount. By how much will a brass rod 100 m long expand with the same change of temperature?
3. Steel expands 11 parts in a million for each 1°C change. Think about the 1.3-km main span of steel for the Golden Gate Bridge. If the span had no expansion joints, show that the span would be 0.21 m longer for a 15°C increase in temperature. [Use the formula ΔL = αLoΔT, where Lo is the original length, α is the "coefficient of expansion" that for steel is (1/1,000,000) per °C, and ΔT is the change in temperature.]
4. Consider a 40,000-km steel pipe that forms a ring to fit snugly all around the circumference of the Earth. Suppose people along its length breathe on it so as to raise its temperature 1°C. The pipe gets longer. It also is no longer snug. How high does it stand above ground level? (To simplify, consider only the expansion of its radial distance from the center of Earth, and apply the geometry formula that relates circumference C and radius r, C = 2πr. The result is surprising!)
A projectile is fired from the edge of a 10m high cliff at 10m/s and an angle of 30 degrees from the horizontal. what is the magnitude of the final velocity
Here's a basketball problem: A 75.0 kg basketball player is running in the positive direction at 8.2 m/s. what is the resulting velocity of the 75.0 kg player
While driving on the freeway at 110 km/h, you pass a truck whose total length you estimate at 25 m. A. If it takes you, in the driver's seat, 6.0s to pass from the rear of the truck to its front, what is the truck's speed relative to the road? ..
An uncharged capacitor is connected to a 44.0V battery until it is fully charged, after which it is disconnected from the battery. What will now be the voltage between the plates
A flying squid is able to "jump" off the surface of the areaby taking water into its body cavity and then ejecting the watervertically downward. how high in the air will the squid rise
A solid uniform sphere and a uniform spherical shell, both having the same mass and radius, How fast is each sphere moving
What happened to the light bulb that did not happen to any other device? (Hint didyou feel the light bulb?) Do you think that your carbon resistorwould still be ohmic if 10 A of current passes throughtit? How about 100 A?
A motorist travels at a constant speed of 35.5 m/s through a school zone, exceeding the posted speed limit. Find the time required to catch the car from the instant the car passes the policeman
Tension is maintained in a string The observed wave speed is 26.5 m/s when the suspended mass is m = 2.87 kg. What is the mass per unit length of the string
a 1.15 kilo ohm resistor and a 1.2 nanof capacitor are connected in series to a 1250 hz generator with an rms voltage
Two ropes support a load of 253 kg. The two ropes are perpendicular to each other, Find the tension in the second rope
An athlete swings a 3.60 kilogram ball horizontally on the end of a rope. Determine what is the tangential speed of the ball
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