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A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.14 m2 and whose thickness is 4 mm. Treat the wall as a slab of the insulating material Styrofoam whose area and thickness are 19 m2 and 0.15 m, respectively. Heat is lost via conduction through the wall and the window. The temperature difference between the inside and outside is the same for the wall and the window. Of the total heat lost by the wall and the window, what is the percentage lost by the window?
Rods of copper, brass, and steel are welded together to form a Y-Shaped figure. The cross-sectional area of each rod is 2 cm2. Calculate the temperature of the junction point
A source emits sound uniformly in all directions. There are no reflections of the sound. What is the total sound power P emitted by the source
Two skaters each of mass 50 kg approach each other along prallel paths separated by 3 m. describe quantitativley the motion of the skaters after they have become connected by the pole
The Sun produces energy by nuclear fusion reactions in which matter is converted into energy. We can gauge that the Sun produces energy at the rate of3.80×1026 W. How many tons of matter does the Sun lose each second?
Distinguish between an element and an atom? Distinguish between mass number and atomic number? What is a practical application of the wave nature of an electron? Which electrons are most responsible for the properties of an atom?
Air conditioners are rated by their coefficient of performance at 76^\circ{\rm F} inside temperature and 92^\circ{\rm F} outside temperature. What is the maximum possible coefficient of performance
a diesel engine weighing 20.5 ton 1 ton 1000 kg is at rest on a track inclined at an angle of 7.5deg. five cars each
A microscope with an eyepiece lens of focal length 1.80 cm and an objective lens of focal length 0.95 cm is used to examine a section of the brain of a sacrificed rat. How far from the objective lens is the object
A car weighing 9810 Newton travels at 60 km/h moves into a circular driveway and slows down to a stop in 5 seconds. Determine how far did it travel
A car is moving with a speed of 27m/s down a long straight road. When it is130m from a traffic light, the light turns red. How long does it take the car to stop
A solid ball of mass M and radius R starts from rest and rollswithout slipping down a hill; Find the ball's speed at the bottom of the hill
Guess scale factor of the Universe
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