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Q1. An engine does 20000 J of work and rejects 6120 J of heat into a cold reservoir whose temperature is 285 K. What would be the smallest possible temperature of the hot reservoir?
Q2. A string of 11 identical Christmas tree lights are connected in a series to a 128v source. The string dissipates 78 watts. What is the equivalent resistance of the light string?
Q3. If the accelerating plates are 2.9 cm apart, and have a potential difference of 28,000 V, what is the magnitude of the uniform electric field between them?
Suppose that the sound level of a conversation is initially at an angry 72 dB and then drops to a soothing 50 dB. determine the initial and final sound intensities
Compute the average intensity
A rail car that weighs 28 N is accelerated at 3.6 m/s/s for 2.2 seconds. How much work is done on the rail car
write an algebraic expression for the total pressure on the diver at that point and calculate the total pressure on the diver in atms
Block B rests on a smooth inclined plane of 21 degrees and block A hangs vertically. Compute the acceleration of the system if the mass of block A is 1.08 kg and that of block B is 5.9 kg.
The portion of the board on the table measures .30m and the portion of the table measures .20m. Explain how far can the center of the box be over the table before the board begins to tilt?
A 55-kg mass ice skater standing stationary on very slipper ice (negligible friction) throws a 0.45 kg baseball with a speed of 27 m/s in the horizonatal direction
A bolt is to be tightened with a torque of 8.0 Nm. what is the least amount of force you must exert
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. What is the acceleration of the crate relative to the ground
A transformer takes 120V (RMS) from a household circuit and drops it to supply a secondary circuit at 8V (RMS) to power a dorbell at 3.75A (RMS). What is the peak current in the primary coil of the transformer
A 50.0kg crate is being pulle along a horizontal smooth surface. What is the magnitude of the normal force acting on the crate
As a new electrical technician, you are designing a large solenoid to produce a uniform 0.250Tmagnetic field near its center. What current will you need to produce the necessary field
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