A 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the frictionless hinges of the door
The door begins to rotate with an angular acceleration of 2.00 rad/s2. What is the moment of inertia of the door about the hinges? A) 4.28 kg?m2
B) 7.52 kg?m2
C) 1.88 kg?m2
D) 0.684 kg?m2
E) 2.74 kg?m2
C
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A golfer hits a ball on a level fairway at an angle of 30° relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at an angle of 60°, and it lands on the green by the other ball. Which statement is accurate for this situation?
a. One ball is in the air longer than the other. b. One ball experiences a greater acceleration while in free flight. c. One ball experiences a smaller acceleration while in free flight. d. Two balls hit at the same speed but different angles will always land in the same location. e. Two balls hit at the same speed but different angles can never land in the same location.
A rod has a length 2.00000 m at 10.0°C. The length of the rod increases to 2.00060 m when the temperature increases to 30.0°C. What is the coefficient of linear expansion of the material from which the rod is made?
A) 1.5 × 10-5/K B) 1.0 × 10-5/K C) 1.0 × 10-3/K D) 2.5 × 10-5/K E) 2.0 × 10-5/K
The early atmosphere of Earth had much less oxygen than today. How has Earth's oxygen abundance increased over Earth's history?
A. Ultraviolet light breaks up ozone into oxygen. B. Volcanic eruptions release large amounts of oxygen. C. Cometary impacts over Earth's history have contributed oxygen to the atmosphere. D. Plant life generated oxygen through photosynthesis. E. None of these choices are correct.
Alone of all the Galilean moons, Callisto shows no sign of plate tectonics
Indicate whether the statement is true or false