A toy rocket, of mass 60 g, achieves a velocity of 80 m/s after 3.0 s when fired straight up. What average thrust force does the rocket engine exert?
A) 3.4 N
B) 1.2 N
C) 2.2 N
D) 3.3 N
E) 1.6 N
C
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The Big Bang predicts that one in four atoms in the universe is helium
Indicate whether the statement is true or false
How does the heat energy from the Sun reach us through the vacuum of space?
a. conduction b. radiation c. convection d. none of the above choices are valid
Which of these situations is possible?
1.Energy is transferred by heat to a system and the internal energy of the system decreases. 2.Energy is transferred by heat to a system and the internal energy of the system remains constant. 3.Energy is transferred by heat to a system and the internal energy of the system increases. 4.All of these are possible.
Molecular Speeds: An oxygen molecule, O2, falls in a vacuum. From what height must it fall so that its translational kinetic energy at the bottom of its fall equals the average translational kinetic energy of an oxygen molecule at 920 K? The mass of one O2 molecule is 5.312 × 10-26 kg, and the Boltzmann constant is 1.38 × 10-23 J/K. Neglect air resistance and assume that g remains constant at 9.8 m/s2 throughout the fall of the molecule.
A. 49 km B. 12 km C. 24 km D. 37 km E. 5.2 km