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1. If the air conditioner in the previous problem is turned off, how fast does the house heat up in K/s?
2. A disk brake of 2 kg steel and 1 kg brake pads is at 20?C. The brakes are now stopping a car, so they dissipate energy by friction and heat up to T2 = 200?C. Assume the brake pads have specific heat of 0.6 kJ/kg-K. After this process, the disk and pads now slowly cool to the ambient, 20?C=T3. Find the exergy destruction in the braking process (1 to 2) and in the cooling process (2 to 3).
The force on the piston is such that it maintains a constant pressure of 400 kPa inside. A valve is now opened nad steam at 1 MPa, 200 degrees C is allowed to enter the cylinder until the volume inside increases to 0.04 m^3.
The force of the resulting water jet physically knocks the mildew off. Estimate the maximum force (lbs.) that a water jet from a powerwaher can make on a glass window.
This problem models an insertion process. Block A (mA = 2kg) is acted on by a horizontal force F (F = 12 N). As A moves to the right, it gets pressed more and more tightly in the channel.
Over a 100-mi^2 surface area, the average level of the water table for an unconfined aquifer has dropped 10 ft due to the removal of 128000 acre*ft of water from the aquifer. Determine the storage coefficient. The specific yield is 0.2 and the por..
Terry wants to purchase a used car for $8000. The dealer offered to finance the deal at 8.5% APR for 4 years with 10% down payment. Terry's bank will provide a loan at 7.8% for 3 years, but wants a 20% downpayment.
A young engineer has invented holographic mobile phones and has approached a venture capital company to invest in it. The venture capital company considers the product to be an all or nothing product
If they are sliding on a smooth horizontal plane with the velocities shown, determine their speeds just after impact. The coefficient of restitution between them is e = 0.6. Disks A and B have a mass of 16kg and 11kg , respectively.
One form of which consists of three equal weights joined by equal length ropes. The gaucho holds on to one weight spinning the bolas overhead. When the bolas is cast the weights cause the configuration to change
ACME supplies prepackaged steel framed and sheathed storage buildings in kit form. The standard column used is a steel hollow round tube with a wall thickness of 0.4 inches fixed at both ends.
Determine the acceleration of the initially stationary 20-kg body when the 50-N force P is applied. The small wheels at B are ideal, and the feet at A are small.
A machine has an initial cost of $10,000. Its market value declines by 20% annually. The repair costs are covered by a warranty in year 1, and then they increase $600 per year. The firm's MARR is 15%.
Some distance downstream, the velocity profile can be (very) roughly approximated by a region inside the wake with u = U/2 and an exterior region with u = 3U/2.
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