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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!)
If a rubber ball of mass 1.0 kg is dropped from a height of 2.0 m and rebounds on the first bounce to 0.75 of the height from which it was dropped, how much energy is dissipated through the collision with the floor?
What is the frequency of the radiation of maximum intensity - What is the energy of photons (joules) emitted by an 107.5-MHz FM radio station?
The electric field due to a charged point object has amagnitude of 25.0 N/C at a distance of0.019 m from the object. At what distance would the potential be tripled
You slide a box of books at constant speed up a 34 degree ramp, applying a force of 190 Newton directed up the slope. Calculate what is the mass of the box
A golf ball is hit with an initial velocity of 50 m/s at an angle of 39 degrees above the horizontal. determine the horizontal distance that the golf ball travels
a johnny is running home from school to watch his favorite soap opera as the stomach turns. he runs 6 blocks east to a
A crate of weight W is being pushed across a horizontal surface by a force directed at an angle of 20 degrees below the horizontal. find the magnitude of the normal force on the crate
A 2 cm aluminum bar issued as a part of a temperature control switch for a high temperature operation. At 200oC the bar has elongated sufficient such that it now touches a second contact causing the switch to close. How far away from the other contac..
An artillery shell is launched on a flat, horizontal field at an angle of ? = 41.6° with respect to the horizontal and with an initial speed of v0= 327 m/s, What is the horizontal distance covered by the shell
It is observed that the size of a real image formed by a concavemirror is four times thesize of the object when the object is 32.5 cm in front of the mirror. What is the radius of curvature of this mirror?
A 19-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 23 N. Find the coefficient of kinetic friction between the runners of the sled and the snow
a solenoid had an inductance of l and carries a current of 15 a if the current goes from 15 a to 0 a in time fo 75 ms
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