how caffeine can affect your stress level. How does it affect your cardiorespiratory system?
Answer:
Caffeine and stress can both elevate cortisol levels. High amounts of caffeine can lead to the negative health effects associated with prolonged elevated levels of cortisol. However, small to moderate amounts of caffeine can lift your mood and give you a boost. Caffeine can raise your heart rate and cause extra heartbeats. And using large amounts of it for long periods can increase your risk of having a heart attack.
Explanation:
Hopefully this is right.
Diffusion occurs faster in gases than in liquids because _____.
the particles are moving faster
the particles are further apart
the particles are moving slower
there are more inter-molecular attractions between particles
Answer:
the particles are moving faster
Explanation:
As we know that diffusion means the rate of escape of gas from small opening.
So here the diffusion rate is basically related to the speed of gas molecules to escape out of the closed container.
So here rate of diffusion is given as
[tex]Rate = \sqrt{\frac{P}{\rho}}[/tex]
so it depends on pressure of gas and density of gas.
Also we know that gas molecules are loosely bounded to each other as we compare the bonding between molecules of liquid.
So here we will say that correct answer is
the particles are moving faster
In the four-stroke internal combustion engine, fuel is ignited during the ____ stroke.
What is a real world application of atwood's machine?
Atwood's machine, a physics concept, is used in real world applications like the early design of elevators, analyzing parachute descent in aerodynamics, and in designing weight-based fitness equipment.
Explanation:An Atwood's machine is a device used in physics to demonstrate the principle of motion. The machine consists of two objects of different masses connected by a light, inextensible cord over a frictionless pulley.
A real world application of the Atwood's machine is found in elevators. In the early design of elevators, the car was one mass and a counterweight acted as the second mass. The counterweight ensured that the elevator car could be lifted smoothly and with minimal force, embodying the motion principle demonstrated by the Atwood's machine.
The Atwood's machine can also be applied in the field of aerodynamics. A parachute carrying a load can be modeled as an Atwood's machine, helping to calculate the rate of descent.
Furthermore, in physical therapy and fitness centers, the machine's principles apply to weight-based gym equipment. Different weights on either side of the cable help determine the force required to lift them.
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If you push down on a piston in a fluid, what happens?
a) The pressure increases in the fluid near the place where you pushed.
b) The pressure is absorbed by the fluid and does not increase
c) The pressure increases in the far corners of the container
d) The pressure increases uniformly throughout the fluid.
If you push down on a piston in a fluid, then the pressure increases uniformly throughout the fluid. Hence, option D is correct.
What is a Piston?A piston is a part of a variety of comparable mechanisms, including reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders, and pneumatic cylinders. It is the moving part, housed by a cylinder, and is sealed off from the atmosphere by piston rings.
The function of a piston rod and/or connecting rod in an engine is to transmit force from the expanding gas in the cylinder to the crankshaft. In a pump, the process is switched around so that force is transferred from the crankshaft to the piston in order to compress or eject the fluid in the cylinder. The piston can cover and reveal openings in the cylinder to function as a valve in some engines.
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Neglecting air resistance, when does a struck baseball accelerate downward at a rate of 9.8 m/s2?
Answer:
Only at the precise moment when it has reached maximum height.
Explanation:
It's the precise moment when it accelerates downward.
What is the relationship between the speed of light and the index of refraction of a transparent substance?
What is the basic unit of matter? atom cell bacterium molecule Description
True or False? When a force is applied through a distance, work is done.
True or false when matter changes state, its chemical properties change
When designing an experiment how do you choose a system to investigate
Radio station klbj broadcasts at a frequency of 93.7 mhz. determine the length of the waves that corresponds to this frequency.
The Answer in significant figures is 3.20 meters. The full Answer is 3.201707577*10^0 meters
Explanation:
You must first convert 93.7Mhz to hz: 93.7mhz * 10^6hz/1Mhz = 9.37*10^7.
Next, since all EM waves' frequency and wavelength = the speed of light(c)(3.00*10^8m/s), insert the new frequency (hertz) into the formula below and solve for Wavelength (lambda)
c=(lambda)(hertz), manipulate the equation to solve for wavelength (lambda)
(lambda)=(C) / (hertz) ; Hertz = hz = s^-1 or 1/s
lambda = 3.00*10^8m/s / 9.37*10^7hz (^^remember hz = 1/s)
Since hz = 1/s, both of the factors have 1/s in the variables' place, so the 1/s cancels and your left with m (meters)
= 3.201707577 meters
If a cross country runner covers a distance of 347 meters in 134 seconds what is her average speed?
The cross country runner cover distance of 347m in 134 seconds so Average speed of cross country runner is 5.53 m/s.
The total distance something has traveled is divided by the total amount of time it took to traverse that distance to arrive at its average speed. Speed is the current rate of movement of something. Average speed is the speed that a vehicle travels at on average over the course of a trip.
Average speed can not be zero. Speed is a measure of how quickly something moves over a short period of time or over a prolonged period of time.
Given Information in the question:
Distance covered by runner(d) = 347m
Time taken to cover distance(t) =134 seconds
If S is average speed then
We know that,
Average speed = Distance /time
S=347/134 m/s
S = 5.53 m/s
Therefore the average speed of cross country runner is 5.53 m/s.
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A car traveling in a straight line has a velocity of +4.4 m/s. after an acceleration of 0.65 m/s2 , the car's velocity is +8.3 m/s. in what time interval did the acceleration occur? answer in units of s.
Answer:
1.53seconds
Explanation:
Using first equation of motion :
V=U + at
Where final velocity (V) =+8.3m/s
Initial velocity (U) =+4.4m/s
Acceleration (a) = 0.65m/s^2
time(s)=?
V=U + at
+8.3^2 = +4.4 + 0.65 * t
Making t the subject of the formula :
Therefore, t= ( +8.3 - 4.4)/0.65 = 1.53seconds
The time interval in which the acceleration occurred is approximately 6.0 seconds.
Explanation:To calculate the time interval in which the acceleration occurred, we can use the equation:
v = u + at
where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time interval.
In this case, the initial velocity (u) is 4.4 m/s, the final velocity (v) is 8.3 m/s, and the acceleration (a) is 0.65 m/s².
Substituting these values into the equation, we have:
8.3 = 4.4 + 0.65t
Solving for t, we get:
t = (8.3 - 4.4) / 0.65
t ≈ 6.0 s
energy transformations when you cook sausages on a campfire burning wood
Actually in this case heat energy is being transferred. Heat energy or thermal energy is transferred from the burning of wood to the sausages for it to be cooked. The sausage is being heated by the fire and is absorbing the heat or thermal energy.
“Plant growth is dependent on the amount of fertilizer applied.” That was the hypothesis Mel and Bill decided on for their science project. They planted identical seeds in the same potting mix, and they used identical pots for each plant. Each pot received the same amount of water, and all the pots were placed in the same location in the greenhouse. After three weeks, Mel and Bill were able to summarize their data. Based on the data collected, what would be the MOST appropriate research question for further study?
D) What is the optimum amount of fertilizer for continued plant growth?
A (an) _____ is a resettable device that protects a circuit from becoming overloaded.
how can you be certain that a chemical change has occurred?
a) there is at least one substance that was not present before the change
b) the amount of measurable material is different after the change
c) the change substance have become warmer
d) at least one substance undergoes a change of state
Which substance is an example of an element? bronze copper methane rust
If an electrically uncharged body is contacted by an electrically charged body, the uncharged body will
What did Galileo discover when he dropped 2 cannon balls of different weights from the leaning tower of pisa
Which is a drawback to the use of oil shale to produce energy
A robot probe drops a camera off the rim of a 278 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s2 . Find the velocity with which it hits the ground. Answer in units of m/s.
What is an example of a chemical change that occurs as part of the rock cycle
A) lava cools and condenses on the Earths surface
B) sedimentary rocks are worn away by water erosion
C) igneous rocks are cracked and broken into smaller pieces by weathering
D) sedimentary ricks are turned into metamorphic rocks by heat and pressure
Answer: It is D.
Explanation:
Sedimentary rocks are turned into metamorphic rocks by heat and pressure is an example of chemical change.
What is chemical change?
Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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the distance between two cities is 300 kilometers. is this longer or shorter than 200 miles?
If Xena's position at time zero is 0 and Gabriele's position is 60 m, what time interval is needed for Xena to catch Gabriele?
x1 =8t
x2=6t+60
x1=x2
8t=6t+60
2t=60
t=30 s
you add 50mL of water at 10 degrees c to 50 mL of water at 80 degrees c. What is the most likely final temperature of the mixture ?
Answer:
45 degrees
Explanation:
The most likely final temperature of the mixture is 45 °C
What is heat?The increment in temperature adds up the thermal energy into the object. This energy is Heat energy.
Given added 50mL of water at 10°C to 50 mL of water at 80°C.
Heat lost or gained is given by Q =m Cv ΔT
Heat lost = heat gain
50 x 4.18 x (T -10)= 50 x 4.18 x (80 - T)
T-10 = 80 - T
2T = 90
T = 45°C
Thus, final temperature of the mixture is 45 °C.
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How can you use weights of the filled cell models to determine the rate and direction of diffusion?
You can use the weights of filled cell models to determine the rate and direction of diffusion by following these steps: weigh an empty cell model, fill the cell and weigh it again, calculate the difference in weight, divide the mass by time to calculate rate, and determine the direction based on weight change.
Explanation:In order to determine the rate and direction of diffusion using weights of the filled cell models, you can follow these steps:
Start by weighing an empty cell model.Fill the cell with a substance and weigh it again.Calculate the difference in weight between the empty cell and the filled cell. This represents the mass of the substance that diffused into the cell.Divide the mass of the substance by the time it took for diffusion to occur. This gives you the rate of diffusion.If the weight increased, the substance diffused into the cell. If the weight decreased, the substance diffused out of the cell.This method allows you to determine both the rate and direction of diffusion based on the change in weight of the filled cell models.
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If the __________ is damaged, a person can form visual memories but not verbal memories.
If the thalamus is damaged of a person, then they can only form visual memories but not verbal memories.
Further Explanation:
The structure of a thalamus is a midline symmetrical of two halves. It is present in the brain of a vertebrate. They are present in between the cerebral cortex and midbrain. The thalamus is a part of diencephalon which in turn is a part of the forebrain. The main functions of a thalamus are:
Pass motor and sensory signals to cerebral cortex Regulation of sleep, alertness and consciousness Major product of the embryonic diencephalon Responsible for learning and memory
The inputs from the receptors are received by the nuclei present in the thalamus. The sensory information is processed by it and then the information is transfer to the cerebral cortex. In this way, it acts as a gateway for the sensory impulses it receives from the various receptors. Thus, if a thalamus of an individual is damaged, then they can only make visual memories. They cannot make verbal memories.
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Answer Details:
Grade: Senior School
Subject: Biology
Topic: Thalamus
Keywords:
Thalamus, symmetrical, brain, cerebral cortex, midbrain, sensory information, receptors, sensory impulse, gateway, nuclei, sleep, diencephalon.
A California Condor is approaching its nest with a large chunk of carrion in its beak. As it approaches, it makes an upward swoop, achieving a momentary upward velocity of 12.8 m/s when the carrion falls from its mouth, hitting a cliff outcropping 32.1 m below. Determine the speed of the carrion upon hitting the outcropping. (28.2 m/s)
Since the bird is initially going up, therefore upon falling form its mouth, the carrion was also going up at similar velocity of 12.8 m/s before it falls down. So calculate the distance taken during this time of momentarily going up:
(v = final velocity at the peak before it falls = 0, v0 = initial velocity = 12.8 m/s, g = gravity = 9.81 m/s^2, d is height taken)
v^2 = v0^2 - 2 g d
0 = 12.8^2 - 2 * 9.81 * d
d = 8.35 m
SO total distance it fell is:
d* = 8.35 m + 32.1 m = 40.45 m
So calculating for final velocity v (v0 = 0 since it stops at the peak before falling down):
v^2 = v0^2 + 2 g d
v^2 = 0 + 2 * 9.81 * (32.1 + 8.35)
v^2 = 793.642
v = 28.17 m/s = 28.2 m/s