If you add 700 kJ of heat to 700 g of water at 70.0°C, how much water is left in the container? The latent heat of vaporization of water is 2.26 × 106 J/kg and its specific heat is is 4190 J/(kg?K)
A) 429 g
B) 258 g
C) 340 g
D) 600 g
E) none
A
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What will happen in the Sun immediately after it has exhausted its supply of hydrogen in its core?
A) The helium core will shrink, heat, and start helium fusion reactions to produce carbon. B) With the core hydrogen used up, the Sun will no longer be able to generate energy in any way. C) The helium core will shrink and heat while hydrogen fusion begins in a shell around the core. D) The core will collapse, resulting in a supernova.
An assault rifle fires an eight-shot burst in 0.40 s. Each bullet has a mass of 7.5 g and a speed of 300 m/s as it leaves the gun. What is the average recoil force on the gun during that burst?
A) 45 N B) 5.6 N C) 16 N D) 2.0 N E) 23 N
A metal bar is used to conduct heat. When the temperature at one end is 82.0°C and at the other is 37.0°C, heat is transferred at a rate of 9 J/s. If the temperature of the hotter end is reduced to 55.7°C, what will be the rate of heat transfer?
a. 2.7 J/s b. 1.6 J/s c. 6.2 J/s d. 3.7 J/s e. 5.0 J/s
An object is dropped from a bridge. A second object is thrown downwards 1.00 s later. They both reach the water 20.0 m below at the same instant. What was the initial speed of the second object?
A) 4.91 m/s B) 14.6 m/s C) 9.90 m/s D) 19.6 m/s E) 21.3 m/s