3. An isolated system has an initial temperature of 30oC. It is then placed on top of a Bunsen burner whose temperature is 70oC for an hour. What is the final temperature? Explain. [25]

2. An inductor can be placed in series with a motor to provide A. braking for the motor. B. heat reduction in the motor windings. C. less current feedback to the driver. D. faster motor response to driver signals.

The 0.5-kg collar C starts from rest at A and slides with negligible friction on the fixed rod in the vertical plane. Determine the velocity v with which the collar strikes end B when acted upon by the 5-N force, which is constant in direction.

A certain well-graded sand deposit has an in-situ relative density of about 50%. A laboratory strength test on a sample of this soil produced an effective friction angle of 31.

A particular Table in a relational database contains 100,000 Data Records/rows, each of which Data Record/row requires 200 bytes. A select statement returns all Data Records/rows in the Table that satisfy an equality search on an attribute.

The tractor shown is stuck with its right track off the ground, and therefore the track is able to move without causing the tractor to move. Letting the radius of sprocket A be d = 0.8 m and the radius of sprocket B be l = 0.

Air is compressed in the compressor of a turbojet engine. Air enters the compressor at 270 K and 58 kPa and exits the compressor at 465 K and 350 kPa. Take the average specific heat at constant pressure (cp, avg) of air as 1.015 kJ / kg.

A digital-to-analog converter uses a reference voltage of 120 V dc and has eight binary digit precision. In one of the sampling instants, the data contained in the binary register = 01010101.

What is a perpetual motion machine of the second kind?

What happens when you turn a jack

Disconnecting means shall be capable of being locked in the open position. The provisions for locking do not have to reamin in place. A. True B. False