25 Questions
What is the formula used to calculate Kinetic Energy?
K = mv2
What is the SI unit of power called?
Watt
What is the unit of Kinetic Energy?
Joule
What is the term for the international system of units?
SI
What is the value of v calculated in the problem?
1.21 × 10 6 m/s
What is the unit of power that represents one joule per second?
Watt
What is the term used to describe the energy storage mechanism?
Potential Energy
What is the term for the unit of power that is equivalent to one joule per second?
Watt
What is the mass of the electron used in the problem?
9.11 ×10 −31 kg
What is the international system of units abbreviated as?
SI
What is the unit of work?
Joule
What is the relationship between energy and work?
Energy and work are two different physical quantities
What is the dimension of 1 joule?
kg ·m²/s²
What is the nature of work?
Scalar quantity
What is the formula for work?
W=F∆r
What is the unit of power equivalent to 1 joule per second?
Watt
What is the physical quantity that is equivalent to 1 kg.m2/s3?
Power
How much work did the 70 kg hiker do in climbing the 1000 m high mountain?
Cannot be determined with the given information
What is the fundamental physical quantity that relates to the hiker's ability to climb the mountain?
Energy
What is the unit of energy expended by the hiker in climbing the mountain?
Joule
What percentage of energy is used by the kidneys?
10%
Which organs use the largest percentage of the body's energy?
Liver and spleen
What is the total percentage of energy used by the kidneys and liver and spleen combined?
37%
What is the primary source of energy for the body?
The option is not specified in the content
What percentage of energy is not used by the kidneys and liver and spleen?
63%
Study Notes
Work and Energy
- Work (W) is a scalar quantity and is calculated as W = F.Δr.
- The unit of work is a joule (J), which is equivalent to N·m or kg·m²/s².
Energy
- Energy has the same unit as work, which is a joule (J).
- Energy storage mechanism is called potential energy.
Kinetic Energy
- Kinetic energy (K) is calculated as K = mv², where m is mass and v is velocity.
- Example: K = 6.7 × 10⁻¹⁹ J, m = 9.11 × 10⁻³¹ kg, v = 1.21 × 10⁶ m/s.
Power
- Power is the rate of doing work or the rate of energy transfer.
- The SI unit of power is the watt (W), which is equivalent to J/s or kg·m²/s³.
Human Body Energy
- In the human body, 10% of energy is used by the kidneys.
- 27% of energy is used by the liver and spleen.
Hiker Example
- A 70 kg hiker climbs a mountain 1000 m high, demonstrating the concept of potential energy.
Quiz about the concept of work, energy, and their units in physics, including joules and newtons.
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