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A solid concrete wall 4.0 m X 2.4 m X 30 cm thick has a thermal conductivity of 1.3 W/(mK) and separates a basement at 18C from the ground outside at 6C. How much heat flows during the walls in one hour?
A 1.4 kilogram small particle similar to object moves in a plane with velocity components vx =25 m/s and vy =80 m/s, Find its angular momentum relative to the point (-2.0, -2.0) m at this same moment
Michael Phelps won a gold medal at the 2008 Beijiing olympics by swimming the 200 meter medley in 1:54:80. On an off-day Mike swims the medley in 1:58:32. What is the speed in mph? (Give the ans. to two decimal places)
a hot-air balloon is ascending at the rate of 11 ms and is 59 m above the ground when a package is dropped over the
A resistor (R = 900 ?), a capacitor (C = 0.25 µF), and an inductor (L = 2.0 H) are connected in series across a 240 Hz AC source for which ?Vmax = 125 V. compute the phase angle between the current and voltage
An object is placed to the left of the converging lens, and the final image produced by the two-lens combination lies 21.2 cm to the left of the diverging lens. How far is the object from the converging lens
mars has a mass of 6.42 x 1023 kg and a radius of 3.40 x 106 m.a what is the acceleration due to gravity on mars?b how
Assume a ray of light is incident on an air / material boundary at 45 degrees to the normal. What is the critical angle for the material when it is surrounded by air
A light ray enters a glass slab at point a at incident angle 74.1 degree and then undergoes total internal reflection at point b what minimum value for the index of refraction of the glass can be inferred from this information
You dip your finger into a pan of water three times each second, producing waves with crests that are separated by 0.16 m. Determine the frequency of these water waves
On a pleasure cruise a boat is traveling relative to the water at a speed of 4.94 m/s due south. find the magnitude of the passenger's velocity relative to the water
A heart defibrillator delivering 400 J of energy by discharging a capacitor initially at 10,000 V has a capacitance of 8.00 µF, What is the voltage of the second defibrillator
A 40 percent efficient electric power plant produces 900MW of electric power and discharges waste heat into 30 C ocean water. Suppose the waste heat could be used to heat homes during the winter instead of being discharged into the ocean. A typical A..
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