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Ambient air with a dew point of 18C and a relative humidity of 60% is conveyed at a rate of 1.5 m3/s through an electric heater. The air is heated to a dry bulb temperature of 50 C. The heated air is then allowed to pass through a tray drier that contains 200 kg of apple slices with an initial moisture content of 80% wet basis. The air exits the dryer with a dew-point temperature of 21.2 C. a. If the electrical energy costs 5 ¢/(kW h), calculate the electrical costs for heating the air per hour of operation. b. Calculate the amount of water removed by air from apple slices per hour of operation. c. If the dryer is operated for 2 h, what will be the final moisture content of the apple slices (wet basis)?
An air-track cart is attached to a spring and completes oneoscillation every 5.67 s. What is the position of the cart when t =29.6 s
A 75kg hiker climbs to the top of a 4100m -high mountain. The climb is made in 5.0h starting at an elevation of 3000m, Calculate the work done by the hiker against gravity
A spring with spring constant 15N/m hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. What is its the mass of the ball
A projectile proton with a speed of 550 m/s collides elastically with a target proton initially at rest. Find the speed of the projectile proton after the collision
If air resistance is neglected show (algebraically) that a ball thrown vertically upward with a speed vo will have the same speed vo. When it comes back down to the starting point.
Dan hits a hockey puck, giving it an initial velocity of 3.0m/s. If the coefficient of kinetic friction between ice and puck is0.020, How far will the puck slide before stopping
The G string on a violin has a fundamental frequency of 196 Hz. It is 29.0 cm long and has a mass of 0.500 g. While this string is sounding, a nearby violinist effectively shortens the G string on her identical violin (by sliding her finger down t..
Compare the distance he wanted to cover in the real world with the "theoretical" distance that could be covered if there was no air resistance - If the engine was close to 100% efficient how much petrol would be used to overcome air resistance duri..
A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.6m/s at ground level. Its engines then fire and it accelerates upward at 3.80 m/s2 until it reaches an altitude of 930m. At that point its engines fai..
A 17 keV electron is brought to rest with colliding twice with target nuclei as in Fig.40-15. (Suppose the nuclei remain stationary.) The wavelength associated with the photon emitted in the second collision is 140pm greater than that associated by t..
A bungee jumper undergoes simple harmonic motion with amplitude 6.4 m and frequency 0.145 Hz. Determine the bungee jumper's velocity at 0.25 seconds
A 50 g aluminum calorimeter contains wter at a temperature of 26 C. When 75 gof lead at a temperature of 85 C is dropped into the calorimeter, How much water was in the calorimeter can
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