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One end of a brass bar is maintained at 300°C, while the other end is kept at a constant but lower temperature. The cross-sectional area of the bar is 5.0 10-4 m2. Because of insulation, there is negligible heat loss through the sides of the bar. Heat flows through the bar, however, at the rate of 2.6 J/s. What is the temperature of the bar at a point 0.15 m from the hot end?
The spheres are brought into contact and then separated to a distance of 2.40 cm. Determine the magnitude of the force that each sphere now experiences, and state whether the force is attractive or repulsive.
An 8,000 rocket is shot straight up from the Earth's surface with the initial speed of 800 m/s. How high does it go.
In extremely cold weather conditions where the inside thermostat is set to 27 C and the outside temperature is -20 C, your 1200 square ft house might lose heat through the walls at a rate of 4000 W. How much energy might you lose in one week?
X rays of wavelength 0.0196 nm are directed in the positive direction of an x axis onto a target containing loosely bound electrons. determine the corresponding change in photon energy
The distance between 2 slits (d=0.155 mm) and a screen is 1.54 m. If the spacing between the 2nd order bright fringe and the 3rd order dark fringe is 3.50 mm obtain the wavelength of the light
a sled is resting on packed snow. the coefficient of kinetic friction is now only 0.12. if a person weighing 650 N sits on the sled, what force is needed to pull the sled across the snow
A thermos contains 125 cm3 of coffee at 85° C. To cool the coffee, you drop two 13-g ice cubes into the thermos. The ice cubes are at first at 0° C and melt completely. What is the final temperature of the coffee? Treat the coffee as if it were wa..
A shell is fired at an angle 30 degree to the horizontal with a velocity 196 m/s. Find the total time of flight horizontal range and maximum height attained.
An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is ? = 1.90 10-7 C/m2, and the plates are separated by a distance of 1.5 10-2 m. How fast is the electron moving just bef..
Theradius changes from 10.0 cm to 20.0 cm in a time of 8.0 s.The magnetic field is 3.0 T. The loop has a resistance of 5.0 ohms. what is thevalue of the current while the radius is changing
The coefficient of kinetic friction between the box and the surface of the incline is 0.2. The initial speed of the box at the bottom of the incline is 2 m/s. How far does the box travel along the incline before coming to rest
A parallel plate capacitor has a capacitance of 1.5 microFarad with air between the plates. What is the dielectric constant of the material
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