The following four forces act on a 4.00 kg object: 1 = 300 N east 2 = 700 N north 3 = 500 N west 4 = 600 N south What is the acceleration of the object?
A) 224 N in a direction 63.4° north of west
B) 300 N in a direction 63.4° north of west
C) 300 N in a direction 26.6° north of west
D) 224 N in a direction 26.6° north of west
E) 2100 N in a direction 26.6° north of west
Answer: D
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The specific heat of ice is 2.100 kJ/kg ?C, the heat of fusion for ice at 0 src="https://sciemce.com/media/4/b9ad0217031f6f632.png" class="w-image" />?
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg 
the heat of vaporization of water at 100.0
is 2,256 kJ/kg, and the specific heat of steam is 2.020 kJ/kg 
What is the final equilibrium temperature when 20.00 grams of ice at -15.0
is mixed with 5.000 grams of steam at 120.0
A. 59.92
B. 56.03
C. 52.76
D. 49.34
E. 45.67
The diagram above represents energy levels in a hydrogen atom. Each level is labeled with its energy (above the ground state of Level 1) in units of electron/volts (eV). The labeled transitions represent an electron moving between energy levels. Which transition represents an electron that absorbs a photon with 10.2 eV of energy?
A) A B) B C) C D) D E) E
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
What is the power output, in hp, of this engine?
Silicates are minerals composed of silicon and oxygen.
Answer the following statement true (T) or false (F)