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Air at 300 K and 100 kPa flows into a hair drier having electrical work input (heating coil and fan motor) of 1500 W. Because of the size of the air intake, the inlet velocity of air is negligible. The air temperature and velocity at the hair dryer exit are 80oC and 21 m/s, respectively. The flow process both constant pressure and adiabatic. Assume air has constant specific heats at 300 K. Cp=1.005 kj/kg.K and R= 0.287kj/kg.K . a) Determine the air mass flow rate into the hair drier, in kg/s b) Determine the air volume flow rate at the hair drier exit, in m3/s c) Determine the diameter of the drier exit in mm.
A 5.00--long ladder has mass 12.5 kg and is leaning against a frictionless wall, making a 64 degree angle with the horizontal. If the coefficient of friction between the ladder and ground is 0.42, what is the mass of the heaviest person who can safel..
A rectangle has a length of 5.50m and a width of 12.0m. What are the perimeter and area of this rectangle
Some extreme sport enthusiasts have been know to jump off the top of El Capitan, It is very important that the parachute be far away from the cliff when opened. How far is the jumper from the cliff when opening the parachute
A skateboarder, starting from rest, rolls down a 13.7-m ramp. When she arrives at the bottom of the ramp her speed is 6.28 m/s. (a) Determine the magnitude of her acceleration, assumed to be constant. (b) If the ramp is inclined at 33.3 ° with respec..
A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.875 rad/s. You, with a mass of 69.5 kg, Calculate the total angular momentum of the system
A certain dog whistle operates at 23.0 kHz while another (brand X) operates at an unknown frequency. estimate the operating frequency of brand X
A 2.65 block is pushed 1.69m up a vertical wall with a constant speed by a constant force of magnitude F applied at angle 55.4 degrees with the horizontal. g= 9.8 m/s2. If the coefficient of kinetic friction between the block & wall is 0.54, Calcu..
Two lenses that are L = 40 cm apart are used to form an image, as shown in figure. Lens 1 is converging and has a focal length f1 = 14 cm; lWhat is the magnification of this image
The next three problems refer to two point charges A and B on the x-y plane, Find the x-coordinate of the point on the x-axis where the electric field is zero
Reflecting telescope is built with a 20-cm-diameter mirror having a 1.00m focal length. It is used with a eyepiece 10X, What is the magnification of the telescope
A water pump lifts water from a well depth of 30 to ground level. How much work does the pump do by moving 3 m^3 of water
A spherical ball with a radius of 2.130×10-1 m is completely submerged in a fluid that has a density of 1.023×103 kg/m3. What is the buoyant force acting on the ball
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