Answers
Answer:
69.69 g
Explanation:
Evaporation of water will take out latent heat of vaporization. Let the mass of water be m and latent heat of vaporization of water be 2260000 J per kg
Heat taken up by evaporating water
= 2260000 x m J
Heat lost by body
= mass x specific heat of body x drop in temperature
60 x 3500 x .750 ( specific heat of human body is 3.5 kJ/kg.k)
= 157500 J
Heat loss = heat gain
2260000 m= 157500
m = .06969 kg
= 69.69 g
Final answer:
Approximately 78 grams of water would need to evaporate from a 60.0-kg person to lower their body temperature by 0.750ºC. This calculation is based on the principles of thermodynamic heat transfer and the specific body temperature, latent heat of water vaporization, and specific heat capacity of the human body.
Explanation:
To calculate the amount of water mass from an individual's body that would need to evaporate to reduce their body temperature, we can use the principle of thermodynamic heat transfer. The basic equation is Q = mLv, where Q is the heat absorbed or lost, m is the mass, and Lv is the latent heat of vaporization.
In this case, knowing that at body temperature of 37.0°C, the latent heat of water vaporization (Lv) is approximately 2430 kJ/kg, we substitute these numbers. Given our desire to reduce body temperature by 0.750°C in a 60 kg human, we first calculate the amount of heat to dissipate (Q) using Q = mcΔT, where c is the specific heat capacity of the human body (roughly equivalent to that of water, 4.184 kJ/kg°C), m is the mass, and ΔT is the change in temperature.
The calculation is as follows:
Q = (60 kg)(4.184 kJ/kg°C)(0.750°C) = ~189 kJ
Next, we substitute Q into the Q = mLv equation to determine the mass m:
m = Q / Lv = 189 kJ / 2430 kJ/kg = 0.078 kg, or 78 grams
Hence, around 78 grams of water would need to evaporate from a 60.0-kg person to lower their body temperature by 0.750ºC.
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Related Questions
A rock is thrown from the top of a building 146 m high, with a speed of 14 m/s at an angle 43 degrees above the horizontal. When it hits the ground, what is the magnitude of its velocity (i.e. its speed).
Two 3.7 microCoulomb charges are 0.8 m apart. How much energy (in milliJoule) went into assembling these two charges? Enter a number with one digit behind the decimal point.
An object having a net charge of 25.0 µC is placed in a uniform electric field of 620 N/C directed vertically. What is the mass of this object if it "floats" in the field?
An electron is moving in the presence of an electric field of 400 N/C. What force does the electron experience?
Answers
The motion of sand is due to the movement of conveyor belt. The horizontal distance between the end of the conveyor belt and the middle of the collecting drum is 2.044 meters.
What is equation of motion?
The equation of motion is the relation between the distance, velocity, acceleration and time of a moving body.
The second equation of the motion for distance can be given as,
Here, is the initial body,
is the acceleration of the body due to gravity and
is the time taken by it.
Given information-
The conveyor is tilted at an angle of 18° above the horizontal.
The Sand is moved without slipping at the rate of 2 m/s.
The sand is collected in a big drum 5 m below the end of the conveyor belt.
The horizontal component of the velocity is given as,
The vertical component of the velocity is given as,
Put the value in the above equation as,
The horizontal distance between the end of the conveyor belt and the middle of the collecting drum is,
Thus, the horizontal distance between the end of the conveyor belt and the middle of the collecting drum is 2.044 meters.
Learn more about the equation of motion here;
Answer:
x = 2.044 m
Explanation:
given data
initial vertical component of velocity = Vy = 2sin18
initial horizontal component of velocity = Vx = 2cos18
distance from the ground yo = 5m
ground distance y = 0
from equation of motion
solving for t
t = 1.075 sec
for horizontal motion
x = 2cos18*1.075
x = 2.044 m
Answers
The momentum of the car is 24000 Kg•m/s
Momentum is defined as the product of mass and velocity. Mathematically, it can be expressed as:
Momentum = mass × velocity
With the above formula, we can obtain the momentum of the car as follow:
- Mass = 1200 Kg
- Velocity = 20 m/s
- Momentum =?
Momentum = mass × velocity
Momentum = 1200 × 20
Momentum of car = 24000 Kg•m/s
Learn more about momentum:
Answer:
24000 kg·m/s
Explanation:
Momentum is Mass x Velocity, so 1200 kg time 20 m/s = 24000 kg-ms/s
d1=_____m
Part B:
d2=______m
Answers
Answer:
Explanation:
In projectile motion , range of projectile is given by the expressions
R = u²sin2θ / g
where u is velocity of projectile.
u = 27 m/s θ = 50
12 = 27² sin 2θ / 9.8
sin 2θ = .16
θ = 9.2 / 2
= 4.6
When we place 90- θ in place of θ , in the formula of range , we get the same value of projectile. hence at 85.4 ° , the range will be same.
B.meter
C.Rate
D.Speed
E.velocity
F.slope
G.refrence point
PLS HELP NOW !!!
Answers
Speed can be calculated if you know the distance that an object travels in one unit of time, therefore the correct answer is option D.
What is speed?
The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.
The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.
Thus, Speed can be calculated if you know the distance that an object travels in one unit of time, therefore the correct answer is option D.
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Answer:
D.Speed
Explanation:
The speed of an object is the distance the object travels in one unit of time.
Answers
Answer:
Changing the battery's voltage will also change the flow of electrons through the circuit. An increase in the voltage will produce more electron movement, and a reduction in the voltage will produce less electron movement.
Explanation:
The voltage is the potential energy between two points in an electric circuit. It is also the work done per unit charge to move a charge between these two points, this work is done against the resistance (analogous to frictional forces in the wire) of the wire. The potential energy is like the push required to move an electron through an electric circuit, and negatively charged particle (electron in the case of the wire) are pulled towards the higher potential, which is conventionally at the positive terminal. Current (flow of electrons) will not occur without any potential between two points.
Changing the battery's voltage will change the push that is experienced by the electrons. If the potential is increased, the electrons will experience more push, which means there will be more movement or flow of electrons through the circuit. Reducing the battery's voltage reduces the push experienced by the electrons; meaning a reduced flow or movement of these electrons through the circuit.
B.)Plants that have broad leaves to capture sunlight and long roots to penetrate the soil.
C.)Animals with thin fur that allows them to get rid of heat efficiently.
D.)Animals with long tongues for capturing prey and sticky pads for climbing trees.
Answers
Answer:
the awnser is A becuse the hair help.