Domanda del libro di testo
A 20,000 kg rocket has a rocket motor that generates 3.0 x 105 N of thrust. Assume no air resistance. What is the rocket's initial upward acceleration?
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Ch 06: Dynamics I: Motion Along a Line
Knight Calc5th EditionPhysics for Scientists and EngineersISBN: 9780137344796
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TOC.tableOfContents
- Ch 01: Concepts of Motion35
- Ch 02: Kinematics in One Dimension75
- Ch 03: Vectors and Coordinate Systems58
- Ch 04: Kinematics in Two Dimensions60
- Ch 05: Force and Motion23
- Ch 06: Dynamics I: Motion Along a Line53
- Ch 07: Newton's Third Law27
- Ch 08: Dynamics II: Motion in a Plane52
- Ch 09: Work and Kinetic Energy56
- Ch 10: Interactions and Potential Energy50
- Ch 11: Impulse and Momentum56
- Ch 12: Rotation of a Rigid Body71
- Ch 13: Newton's Theory of Gravity52
- Ch 14: Fluids and Elasticity44
- Ch 15: Oscillations55
- Ch 16: Traveling Waves37
- Ch 17: Superposition39
- Ch 18: A Macroscopic Description of Matter53
- Ch 19: Work, Heat, and the First Law of Thermodynamics60
- Ch 20: The Micro/Macro Connection53
- Ch 21: Heat Engines and Refrigerators34
- Ch 22: Electric Charges and Forces40
- Ch 23: The Electric Field39
- Ch 24: Gauss' Law32
- Ch 25: The Electric Potential63
- Ch 26: Potential and Field57
- Ch 27: Current and Resistance42
- Ch 28: Fundamentals of Circuits39
- Ch 29: The Magnetic Field47
- Ch 30: Electromagnetic Induction60
- Ch 31: Electromagnetic Fields and Waves32
- Ch 32: AC Circuits63
- Ch 33: Wave Optics32
- Ch 34: Ray Optics57
- Ch 35: Optical Instruments30
- Ch 36: Special Relativity38
- Ch 37: The Foundations of Modern Physics25
- Ch 38: Quantization49
- Ch 39: Wave Functions and Uncertainty31
- Ch 40: One-Dimensional Quantum Mechanics35
- Ch 41: Atomic Physics18
- Ch 42: Nuclear Physics27
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Capitolo 6, Problema 20a
Zach, whose mass is 80 kg, is in an elevator descending at 10 m/s. The elevator takes 3.0 s to brake to a stop at the first floor. What is Zach's weight before the elevator starts braking?
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Step 1: Understand the concept of weight. Weight is the force exerted on an object due to gravity and is calculated using the formula: , where is the mass of the object and is the acceleration due to gravity (approximately 9.8 m/s² on Earth).
Step 2: Identify Zach's mass from the problem. His mass is given as 80 kg.
Step 3: Use the formula for weight to calculate Zach's weight before the elevator starts braking. Substitute kg and m/s² into the formula .
Step 4: Perform the multiplication to find Zach's weight. Multiply 80 kg by 9.8 m/s² to determine the force exerted on him due to gravity.
Step 5: Interpret the result. The calculated weight represents Zach's weight before the elevator starts braking, as it is unaffected by the elevator's motion at this point.
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Weight
Weight is the force exerted on an object due to gravity, calculated as the product of mass and the acceleration due to gravity (approximately 9.81 m/s² on Earth). For Zach, whose mass is 80 kg, his weight can be determined using the formula: Weight = mass × gravity, resulting in a force measured in newtons.
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Percorso guidato
10:19
Torque Due to Weight
Mass
Mass is a measure of the amount of matter in an object, typically measured in kilograms. It is a scalar quantity and does not change regardless of the object's location in the universe. In this scenario, Zach's mass is given as 80 kg, which is essential for calculating his weight.
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20:32Mass Spectrometers
Acceleration due to Gravity
Acceleration due to gravity is the rate at which an object accelerates towards the Earth when in free fall, approximately 9.81 m/s². This constant is crucial for calculating weight, as it represents the gravitational pull acting on an object's mass. It remains constant near the Earth's surface, allowing for straightforward weight calculations.
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05:20Acceleration Due to Gravity
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