A circular flow of warmer fluid and cooler fluid is called what? PLEASE HELP I AM BEGGING YOU!!!
A object is placed in front of a convex mirror. The image that forms is .
The answer is virtual.
Explanation:
The image formed by convex mirror is virtual and erect always.
Let's consider two cases :
(1) When the object is placed at infinity, the image will be formed at the focus and behind the mirror. A point sized image will form and its nature is virtual and erect.
(2) When the object is placed anywhere from infinity to pole of the mirror, then the image will form between pole and focus. Its size is diminished and nature is virtual and erect again.
how does scientific knowledge develop through making observations about the natural world ?
A 5.00-kg box slides 6.50 m across the floor before coming to rest. what is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?
Ou are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. the soccer ball is kicked at 47° from the edge of the building with an initial velocity of 21 m/s and lands 57 meters away from the wall. how tall is the building that the child is standing on?
Strenuous activity releases a substance called _________________into your bloodstream. Question 4 options: Nutrients Blood Lactic Acid Oxygen
If millikan was measuring the charge on an oil droplet with 3 negatively charged electrons on it, what charge would he have measured on the droplet?
Millikan would have measured a charge of 4.8 imes [tex]10^{-19}[/tex] C on an oil droplet carrying 3 electrons, as each electron has a charge of 1.6 imes [tex]10^{-19}[/tex] C.
If Millikan was measuring the charge on an oil droplet with 3 negatively charged electrons on it, he would have measured a charge on the droplet by multiplying the charge of a single electron by the number of electrons on the droplet. Therefore, the charge measured would be 3 times 1.6 imes [tex]10^{-19}[/tex] C, which equals 4.8 imes [tex]10^{-19}[/tex] C. Each electron has a fundamental charge of 1.6 imes [tex]10^{-19}[/tex] C, a value that Millikan determined through his experiment to be the standard charge of a single electron.
An increase in which quantity will result in an increase in momentum?
Answer: A velocity is correct
A car travelling 95 km/h is 210 behind a truck travelling 75 km/h. how long will it take the care to reach the truck
What type of pipe wrenches are designed for turning and holding where marring is not objectionable?
Final answer:
Mechanics extend the handle of a wrench with a pipe to increase leverage and torque, making it easier to remove very tight bolts, based on the physics principle of the lever arm. While effective, this increases the risk of over-torquing and potentially damaging equipment or injuring oneself.
Explanation:
When mechanics need to remove a very tight bolt, they may use a tactic that involves sliding a length of pipe over the handle of a wrench. This technique provides additional leverage which increases the torque applied to the bolt, making it easier to loosen. The physics principle at play here is that of the lever arm, where a longer handle effectively increases the distance from the pivot point (the bolt in this case), requiring less force to achieve the same amount of turning force or torque.
However, this increased torque also brings with it risks; applying too much force can shear or snap a bolt, potentially leading to equipment damage or personal injury. Therefore, while extending the handle of a wrench can be helpful, it is important to use this method with caution to avoid over-torquing.
Why Pipes over Wrench Handles Work
The principle behind using a pipe over a wrench handle is simple: a longer handle means you have a larger radius to apply your force, which translates to more torque on the bolt or nut.
If your front lawn is 18.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1050 new snow flakes every minute, how much snow (in kilograms) accumulates on your lawn per hour? assume an average snow flake has a mass of 2.00 mg
A ball is dropped off of a tall building and falls for 2 seconds before landing on a balcony. a rock is then dropped from the top of the building and falls for 4 seconds before landing on the ground. how does the final speed (meaning the speed it had just before landing) of the rock compare to the final speed of the ball?
Final answer:
The final speed of the rock is greater than that of the ball because the rock falls for a longer time, resulting in a final speed that is twice as much as that of the ball when comparing the times of 2 seconds and 4 seconds of free fall under gravity.
Explanation:
To compare the final speeds of the ball and the rock dropped from the same building, but at different times, we will use the equation of motion under constant acceleration due to gravity, which is v = u + at, where v is the final velocity, u is the initial velocity (zero in this case, since both objects are dropped), a is the acceleration due to gravity (9.81 m/s2), and t is the time in seconds.
For the ball that falls for 2 seconds:
v = 0 + (9.81 m/s2) * (2 s)v = 19.62 m/sFor the rock that falls for 4 seconds:
v = 0 + (9.81 m/s2) * (4 s)v = 39.24 m/sThus, the final speed of the rock is greater than the final speed of the ball. Specifically, the rock's final speed is twice that of the ball's final speed because the time it falls is doubled, and since the acceleration due to gravity is constant, the final speed simply scales with time.
An ideal gas occupies 600 cm3 at 20c. at what temperature will it occupy 1200 cm3 if the pressure remains constant? 10c 40c 100c 313c
At the constant pressure, the final temperature of the gas was equal to 313ºC at a volume of 1200cm³. Therefore, option (D) is correct.
What is Charles's law?Charles's law can be explained as when the pressure is kept constant, the volume of gas is directly proportional to its absolute temperature.
Therefore, V∝ T
or [tex]{\displaystyle \frac{V_1}{T_1} =\frac{V_2}{T_2}[/tex] ..................(1)
Given, the initial temperature of the gas, T₁ = 20 ºC
T₁ = 20 + 273 = 293 K
The initial volume of the gas, V₁ = 600 cm³
The final volume of the gas, V₂ = 1200 cm³
Substitute the value of V₂, T₁, and V₁ in equation (1) to find the final temperature of the gas:
[tex]{\displaystyle \frac{600}{293} =\frac{1200}{T_2}[/tex]
T₂ = 586 K
T₂= 586 - 273 = 313 ºC
Therefore, the final temperature of the gas was equal to 313 ºC at the volume of 1200cm³.
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A car slows down from 23 m/s to rest in a distance of 85 m. what was its acceleration, assmed constant
First calculate the time by using following equation:
d= (vi+vf)/2 x t
where t = time
vi is the initial velocity = 23 m/s
vf is the final velocity = 0 m/s
and d is the distance covered = 85m
85 = (23 + 0)/2 x t
t = 85/11.5 = 7.39s
Now use this equation to find acceleration:
a= (vf-vi)/t
a = 0 – 23/ 7.39
a = -3.112 m/s²
so, the acceleration is 3.112 m/s²
The magnitude of the car's acceleration was 3.1 m/s²
Further explanationAcceleration is rate of change of velocity.
[tex]\large {\boxed {a = \frac{v - u}{t} } }[/tex]
[tex]\large {\boxed {d = \frac{v + u}{2}~t } }[/tex]
a = acceleration (m / s²)v = final velocity (m / s)
u = initial velocity (m / s)
t = time taken (s)
d = distance (m)
Let us now tackle the problem!
Given:
initial velocity = u = 23 m/s
final velocity = v = 0 m/s
distance = d = 85 m
Unknown:
acceleration = a = ?
Solution:
[tex]v^2 = u^2 + 2ad[/tex]
[tex]0^2 = 23^2 + 2a(85)[/tex]
[tex]0 = 529 + 170a[/tex]
[tex]170a = -529[/tex]
[tex]a = -529 / 170[/tex]
[tex]\large {\boxed {a = -3.1 ~ m/s^2} }[/tex]
The acceleration was 3.1 m/s² in the opposite direction to its velocity.
A negative sign means the direction of acceleration is opposite to the direction of velocity.
Learn moreVelocity of Runner : https://brainly.com/question/3813437Kinetic Energy : https://brainly.com/question/692781Acceleration : https://brainly.com/question/2283922The Speed of Car : https://brainly.com/question/568302 Answer detailsGrade: High School
Subject: Physics
Chapter: Kinematics
Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate
Sally travels by car from one city to another. she drives for 30.0 min at 80 km/h, 12 min at 105 km/h, and 45 min at 40 km/h. she spends 11.0 min eating lunch and buying gas. (a) determine the average speed for the trip. km/h (b) determine the total distance traveled. km
Which of the following describes a scientific law? A.based of scientific evidence B.explains how and why nature does what it does C.not based of scientific evidence
Answer: A: based in scientific evidence.
Explanation:
Scientific laws are made after proper research under varying conditions using scientific method to show that a particular theory is right under stated conditions
Scientific laws are carried out using methods ands not just any process with condition taken into consideration
Neglecting air resistance, what maximum height will be reached by an arrow launched straight upward with an initial speed of 35 m/s
The maximum height reached by the arrow launched straight upward with an initial speed of 35 m/s is 62.5 meters.
Explanation:To calculate the maximum height reached by an arrow launched straight upward, we can use the equations of motion. Neglecting air resistance, the arrow will reach its maximum height when its vertical velocity becomes zero. The equation to calculate the maximum height, h, is given by:
h = (v2) / (2g)
where v is the initial speed of the arrow and g is the acceleration due to gravity.
Plugging in the values, we get:
h = (352) / (2 * 9.8) = 62.5 meters
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Item 13You have four $10 bills and eighteen $5 bills in your piggy bank. How much money do you have?
A stone is dropped from a tower 100 meters above the ground. The stone falls past ground level and into a well. It hits the water at the bottom of the well 5.00 seconds after being dropped from the tower. Calculate the depth of the well. Given: g = -9.81 meters/second2.
Young people do have the ability to initiate a positive change in their community. Depending where they live they could always give back by completing some type of community service. Some examples are setting up a beach or park clean-up, volunteering at a soup kitchen or organizing a fundraiser or a food drive for the local homeless shelter.
What is the name of the scientist who discovered that atoms have positive charges? A. John Dalton B. Robert Millikan C. Eugen Goldstein D. Ernest Rutherford
True or False? The dependent variable value changes according to changes in the other variables.
In an internal combustion engine, the gas vapor/air mixture enters the cylinder during the _____ stroke.
Discuss the validity of extrapolating the acceleration value to an angle of 90°.
Answer:
Yes, it is validated to extrapolate the acceleration value to an angle of 90 degrees.
Explanation:
Assume the friction-less inclined plane. There exists a mathematical relationship between angle of incline and the object rolling in downward direction on friction-less inclined plan.
Acceleration of object = sinθ × g
Here, θ=90 degrees so,
Acceleration of object = g = 9.8 m/s^2
Hence, it is validated to extrapolate the acceleration value to an angle of 90 degrees .
Swinging a tennis racket against a ball is an example of a third class lever. true or false
The above statement is true
Swinging a tennis racket against a ball is an example of a third class lever.
Explanation;Levers are examples of simple machines that makes work easier by minimizing human effort to do work.Levers are classified according to the position of the load and the effort in respect to the fulcrum. That is, first class, second class and third class. In first class type of lever the fulcrum occurs between the load and the effort, in class two the load is between the fulcrum or pivot and the effort, while in third class, the effort occurs between the load and the fulcrum or the pivot.Swinging a tennis racket is an example of third class lever since the effort is between the load and the fulcrum.A car travels 10.0 m/s. What is its velocity in km/h?
A. 0.6 km/h
B. 36,000 km/h
C. 36 km/h
D. 360 km/h
HELP QUICK!! GIVING 16 PTS!!
Taste disorders may be linked to a problem with the __________ system. A. olfactory B. tactile C. visual D. perceptual
Correct Answer is A. A:Olfactory
Taste disorders may be linked to a problem with the olfactory system.
Therefore the correct answer is option A.
What is science?The deliberate, empirically supported pursuit and application of knowledge and understanding of the natural and social worlds are what is known as science.
The physiological system that detects smells is called the olfactory system. The system contains the nasal cavities, which, in their bottom and top halves, respectively, support the olfactory mucous membrane for the sense of smell and function as breathing tubes.
As a result, olfactory system issues may be related to taste abnormalities; consequently, option A is the appropriate response.
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What is the efficiency of a machine that miraculously converts all the input energy to useful output energy?
Answer: 100%
Explanation:
Efficiency = output/input = 100/100 x 100 = 100% efficient
Machines are not 100% efficient because some of the work done by a machine is used to overcome friction. So work output is always less than work input.
Work: Done by machines is calculates as Mechanical Efficiency which is Work Output divided by Work Input.
Which one of the following indicates a drop in temperature? A. The alcohol in a thermometer expands. B. The brass on a bent bimetallic strip is on the outside curve. C. The column of liquid in a thermometer moves up three degrees. D. A bimetallic strip bends so that the steel is on the outside curve.
Answer:
A bimetallic strip bends so that the steel is on the outside curve.
Explanation:
A bimetallic strip is a combination of two different metals. The linear coefficient of expansion of various metals are different, depending on their characteristics. For example, when a bimetallic strip of brass and steel are taken, thermal expansion coefficient of brass is more than that of steel.
That implies brass expands more than steel, for a given amount of heat supplied. So brass will curve outward since it becomes longer compared to steel. Steel will curve inwards.
Similarly, for cooling process where a drop in the temperature occurs, brass contracts more compared to steel and so Steel will be on outside curve.
The color that we see when looking at a pigmented object is ______.
a. the wavelengths that are reflected or transmitted by the pigmented object
b. the wavelengths that have been raised to an excited state by the pigmented object
c. the wavelengths that are absorbed by the pigment
d. the wavelengths that the pigmented object created after interacting with sunlight