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Questions and Answers
What is the concept of energy that remains fixed in any process that occurs in nature?
What is the concept of energy that remains fixed in any process that occurs in nature?
- Conservation of mass
- Conservation of momentum
- Conservation of energy (correct)
- Conservation of velocity
What is the symbol for the stored energy in the body?
What is the symbol for the stored energy in the body?
- ΔW
- ΔQ
- Δt
- ΔU (correct)
What happens to a body that is doing no work and at a constant temperature?
What happens to a body that is doing no work and at a constant temperature?
- It loses heat to the surrounding environment (correct)
- It gains heat from the surrounding environment
- It does work at a constant rate
- It remains at a constant temperature
What is the rate of doing work in the body?
What is the rate of doing work in the body?
What is the equation that relates the change in stored energy, heat lost, and work done by the body?
What is the equation that relates the change in stored energy, heat lost, and work done by the body?
What is the unit of Δt?
What is the unit of Δt?
What is the measure of the human body's ability to do work?
What is the measure of the human body's ability to do work?
What unit is used to express food energy?
What unit is used to express food energy?
What is the unit of energy in the SI system?
What is the unit of energy in the SI system?
What is the unit of power in the SI system?
What is the unit of power in the SI system?
What is the unit of expressing the rate of energy consumption of the body?
What is the unit of expressing the rate of energy consumption of the body?
What is the conversion of 1 erg in Joule?
What is the conversion of 1 erg in Joule?
What happens when your body's internal energy is lost in a short time interval?
What happens when your body's internal energy is lost in a short time interval?
Why does cycling require less energy than running?
Why does cycling require less energy than running?
What is the purpose of sweating when your body does much work?
What is the purpose of sweating when your body does much work?
What provides the energy necessary for muscle contraction?
What provides the energy necessary for muscle contraction?
What happens to the body's internal energy when you consume food?
What happens to the body's internal energy when you consume food?
What is the result of the energy released by chemical reactions in the body?
What is the result of the energy released by chemical reactions in the body?
What is the primary reason why your bike would gradually slow down if you did not pedal at all?
What is the primary reason why your bike would gradually slow down if you did not pedal at all?
What happens to the kinetic energy of a runner when their body moves downward?
What happens to the kinetic energy of a runner when their body moves downward?
What is the characteristic of more efficient runners?
What is the characteristic of more efficient runners?
Why does a runner's center of mass continually alternate between speeding up and slowing down?
Why does a runner's center of mass continually alternate between speeding up and slowing down?
What happens to the gravitational potential energy of a runner when they move upward?
What happens to the gravitational potential energy of a runner when they move upward?
What is the main difference between riding a bike and running on a flat surface?
What is the main difference between riding a bike and running on a flat surface?
What is the primary purpose of the body's temperature regulation mechanisms?
What is the primary purpose of the body's temperature regulation mechanisms?
What type of radiation does the body emit?
What type of radiation does the body emit?
What is the approximate value of the radiation coefficient (𝐾𝐾𝑟𝑟)?
What is the approximate value of the radiation coefficient (𝐾𝐾𝑟𝑟)?
What is the formula for heat loss due to radiation (𝐻𝐻𝑟𝑟)?
What is the formula for heat loss due to radiation (𝐻𝐻𝑟𝑟)?
What is the primary factor that affects the convection coefficient (𝐾𝐾𝑐𝑐)?
What is the primary factor that affects the convection coefficient (𝐾𝐾𝑐𝑐)?
What is the heat loss due to convection (𝐻𝐻𝑐𝑐) proportional to?
What is the heat loss due to convection (𝐻𝐻𝑐𝑐) proportional to?
Muscles consist of bundles of protein filaments.
Muscles consist of bundles of protein filaments.
When a muscle contracts, it generates a force that acts through a distance.
When a muscle contracts, it generates a force that acts through a distance.
The energy used by the body when muscles contract is always in the form of kinetic energy.
The energy used by the body when muscles contract is always in the form of kinetic energy.
The work done by the biceps muscle is equal to the work done by the force the hand exerts on the weight.
The work done by the biceps muscle is equal to the work done by the force the hand exerts on the weight.
The heat generated by the body when muscles contract is always equal to the work done by the muscles.
The heat generated by the body when muscles contract is always equal to the work done by the muscles.
When you hold a weight in your hand and contract the biceps muscle in your arm, the weight's gravitational potential energy decreases.
When you hold a weight in your hand and contract the biceps muscle in your arm, the weight's gravitational potential energy decreases.
Muscles can only contract in one direction.
Muscles can only contract in one direction.
The energy used by the body when muscles contract is always used to move one of the body's limbs.
The energy used by the body when muscles contract is always used to move one of the body's limbs.
Muscles can convert all the energy they use into work.
Muscles can convert all the energy they use into work.
The work done by muscles is always proportional to the force they exert.
The work done by muscles is always proportional to the force they exert.
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