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A 40-cm-long, 800-W electric resistance heating element with diameter 0.5 cm and surface temperature 120°C is immersed in 75 kg of water initially at 20°C. Determine how long it will take for this heater to raise the water temperature to 80°C. Also, determine the convection heat transfer coefficients at the beginning and at the end of the heating process.
A 300 g bird flying along at 5.7 m/s seesa 10 g insect heading straight toward it with a speed of 35 m/s (as gauged by an observer on the ground, not by the bird). The bird opens its mouth wide and enjoys a nice lunch.
A 1500 -kg automobile travels at a speed of 75 -km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes, and the car skids to a stop.
Draw a FBD for the falling coffee filter. What is the net force? What are we assuming by using the average velocity from Procedure 1 to estimate the height of the fall in Procedure 2
What is the maximum distance along the ladder a person of mass 15M can climb before the ladder starts to slip?
An object is solid throughout. When the object is totally submerged in ethyl alcohol, its apparent weight is 15.1 N. When completely submerged in water, its apparent weight is 12.8 N. What is the volume of the object?
Old TV sets utilized 10 watts of power to provide "instant on" If the set was idle 16 hrs/day compute the ecological cost in kg/year of bituminous coal (30 MJ/kg) burned in a 35% efficient power plant.
A traveler in a rocket of proper length 2d sets up a coordinate system S' with its origin O' anchored at the exact middle of the rocket and the x' axis along the rocket's length. At time t' = 0 she ignites a flashbulb at O'.
A projectile is launched straight up at 141m/s. How fast is it moving at the top of its trajectory? Presume it is launched upward at 45 degrees above the horizontal plane. How fast is it moving at the top of its curved trajectory.
Assume that initial conditions have been set up so that the ball's motion forever lies in one parabola. Let this parabola hit the rings at an angle ? from the horizontal.
An AC voltage source, with a peak output of 200V, is connected to a 50 ohm resistor. What is the rate of energy dissipated due to heat in the resistor
An object 0.520cm tall is placed 17.0cm to the left of the vertex of a CONVEX spherical mirror having a radius of curvature of 24.0cm. Calculate the size of the image
How large a force must the compressed air exert to lift a 1.32 x 104 N car? What pressure produces this force? Neglect the weight of the pistons.
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