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The inner and outer surfaces of a 25-cm-thick wall in summer are at 27°C and 44°C, respectively. The outer surface of the wall exchanges heat by radiation with surrounding surfaces at 40°C, and convection with ambient air also at 40°C with a convection heat transfer coefficient of 8 W/m2 · °C. Solar radiation is incident on the surface at a rate of 150 W/m2. If both the emissivity and the solar absorptivity of the outer surface are 0.8, determine the effective thermal conductivity of the wall.
A football punter accelerates a football from rest to a speed of 13 m/s during the time in which his toe is in contact with the ball (about 0.20 s). what average force does the punter exert on the ball
A 722-kg car stopped at an intersection is rear-ended by a 1620-kg truck moving with a speed of 14.5 m/s. find the final speed of both vehicles after the collision
Electrons are accelerated through a voltage difference of 265 kV inside a high voltage accelerator tube. What is the final kinetic energy of the electrons
Suppose that the bike rider in problem 15 pedaled up the hilland never came to a stop. in what system is energy conserved? from what form of energy did the bike gain mechanial energy?
A gazelle running at a constant 20 m/s has a 60m head start on a resting cheetah. Does the cheetah catch the gazelle
A rocket is launched straight up with constantacceleration. Four seconds after liftoff, a bolt falls offthe side of the rocket. What was the rocket's acceleration
As you can easily tell, ethics is a major component in the world of marketing research. What are the responsibilities of the 1) research provider and 2) research user, ie, the marketing manager?
Objects A and B are both positively charged. Both have a mass of 150 gram, Determine how large is the force on A
Three moles of an ideal gas undergo a reversible isothermal compression at 21.5°C. During this compression, 1870 J of work is done on the gas. What is the change of entropy of the gas?
For the capacitor network shown in the figure below, a constant potential difference of 50.0V is maintained across points a and b by a battery. Calculate the charge stored on the plates of the 30 μF capacitor.
A magnet in the form of a cylindrical rod has a length of 5.00 cm and a diameter of 1.00 cm. It has a uniform magnetization of 5.30 x 103 A/m. What is its magnetic dipole moment?
The current in a coil changes from 3.10 A to 1.90 A in the same direction in 0.530 s. what is the inductance of the coil
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