A huge explosion is heard 20 miles away. How long does it take the sound to travel that far? (20 miles = 32,000 meters)
93 s
Physics & Space Science
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When 1.0 gram of hydrogen combines with 8.0 grams of oxygen, 9.0 grams of water is formed. But is this true? During the reaction 2.86 × 10^5 J of energy is released. How much mass is actually lost in this reaction?
Physics & Space Science
A motor has an internal resistance of 12.0 ?. When running, the motor has a back emf of 29 V and draws a current of 3.7 A. What is the supply voltage in this case?
a. 29 V b. 44 V c. 73 V d. 15 V e. 32 V
Physics & Space Science
When a rigid body rotates about a fixed axis all the points in the body have the same angular speed
Indicate whether the statement is true or false
Physics & Space Science
What is the maximum theoretical efficiency possible for an engine operating between 
and 
A. 25%. B. 45%. C. 55%. D. 75%.
Physics & Space Science