The air inside a balloon exerts a force of 1.5 n on an area of 0.5 m^2. what is the pressure inside the balloon?
Lesson 9: Fluid Pressure (connexus students!)
1.D) 3 n/m^2
2.C) 2 meters below the surface of a swimming pool
3.B) cork
4.A) depends only on the type of fluid
5.A) the air pressure decreases
Compare how your weight, mass, and the normal force exerted by the floor change when you are in an elevator that starts from rest and accelerates upward.
Final answer:
During upward acceleration in an elevator, your perceived weight increases due to the increased normal force required for acceleration, although your mass remains unchanged. Once the elevator moves at a constant speed, the normal force equals your actual weight, and the scale reads your true weight.
Explanation:
When you are in an elevator that starts from rest and accelerates upward, your weight, mass, and the normal force exerted by the floor experience noticeable changes. Firstly, your mass remains constant regardless of the elevator’s movement because mass is a measure of the amount of matter in your body and does not depend on gravity or acceleration. However, your weight and the normal force exerted by the floor change as the elevator moves.
When the elevator accelerates upward, the normal force exerted by the scale (or floor) must not only support your weight but also provide the force necessary to accelerate you along with the elevator. This means the normal force, which you perceive as your weight, increases. Thus, if you were standing on a bathroom scale during this acceleration, the scale would display a value greater than your actual weight at rest, reflecting the increased normal force required to accelerate you upward.
Once the elevator reaches a constant speed, you would no longer be accelerating, and the normal force would again match your actual weight, assuming the elevator is moving at a constant velocity upward or remains stationary. In this scenario, the scale would then read your true weight, similar to when you are at rest. This illustrates how acceleration affects the normal force and perceived weight, differing from the constant mass.
Dry air will break down if the electric field exceeds about 3.0 Ã 106 v/m. what amount of charge can be placed on a capacitor if the area of each plate is 7.9 cm2?\
Which describes the motion in a convection current?
a) horizontal motion only
b) vertical motion only
c) linear motion
d) circular motion
Circular motion is the type of motion which is responsible for the motion in a convection current. Thus, the correct option is D.
What is Convection current?The heat energy can be transferred through the process of convection by the difference which is occurring in the temperature between two parts of the fluid. Due to this difference in temperature, the hot fluids tend to rise, whereas the cold fluids tend to sink deeper. This creates a current within the fluid which is called as the convection current.
Convection currents are the heat-driven cycles which occur in the air, ocean, and mantle due to the circular motion. They are caused by a difference in temperature, often due to a differing proximity to a heat or energy source. The difference in the temperature relates directly to the density of the material, which is causing this effect.
Therefore, the correct option is D.
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In the four-stroke internal combustion engine, fuel is ignited during the ____ stroke.
The elements with the largest atomic radii are found in the
The atomic radius typically increases down a specific group and decreases throughout a period from left to right. Group I and the bottom of the groups are home to the isotopes with the biggest atomic radii.
What is an Atom?The atom is the smallest piece of matter that may be divided without releasing electrically charged particles.
Additionally, it is the smallest piece of matter with the characteristics of a chemical substance. The atom is indeed the fundamental unit of chemistry as a result.
Look into the many-electron-electron configurations in the electron shells surrounding the atom's nucleus.
The majority of an atom is blank land. A cloud of electrons with negative charges surrounds a positive charge nucleus made up of neutrons and protons, which make up make the rest of the structure.
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The basic unit of pressure mapped on weather maps is
The basic unit of pressure mapped on weather maps is Millibar (mb). The correct option is A.
The standard unit for displaying atmospheric pressure on weather maps is the millibar, which is a frequently used unit of pressure in meteorology. It is equal to 100 pascals, or one thousandth of a bar.
Isobars, or lines bridging regions of equal atmospheric pressure, are shown on weather maps, and they are commonly labelled in millibars.
With the aid of this device, meteorologists can quickly analyse and evaluate pressure variations and patterns across various geographic locations, which aids in comprehending weather systems and the circumstances that go along with them.
Thus, the correct option is A.
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Your question seems incomplete, the probable complete question is:
The basic unit of pressure mapped on weather maps is
A) Millibar (mb)
B) Pascal (Pa)
C) Atmosphere (atm)
D) Pound per square inch (psi)
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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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
A plane flies 600 kilometers away from its bad at 400 meters per second then flies back to its base at 600 meters per second. What is it’s average velocity?????
Which expression is a measurement of density? 5.2 cm 3 0.71 mg 20 g/cm 2 5.13 kg/l?
We know that the density is defined as the ratio of mass to the volume.
Density = Mass/volume
We know that the unit of the mass is kg
Unit of the volume is liter (l)
Therefore the unit of the density will be kg/l .
Now the first expression is 5.2 Cm^3 which is a unit of volume. Therefore it will not be the expression for density.
Second expression is 0.71 mg which has unit of mass. Therefore it will also not be the expression for the density
Third expression is 20 g/cm^2 which also not have the unit of density.
Fourth expression is 5.13 kg/l which is having unit of density.
Therefore the expression of density will be 5.13 kg/l
A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. how much time is required for the car to reach a speed of 90 km/h?4
Final answer:
To calculate the time for a car to accelerate from 60 km/h to 90 km/h with a constant acceleration of 2.0 m/s², velocities are converted to m/s and the formula v = u + at is used. The result is a time of 4.17 seconds.
Explanation:
The question pertains to a car initially traveling at 60 km/h that accelerates at a constant rate of 2.0 m/s² until it reaches a speed of 90 km/h. To calculate the time required for the car to reach this speed, we must first convert the initial and final velocities from km/h to m/s. Doing so, 60 km/h equals 16.67 m/s and 90 km/h equals 25.00 m/s. The formula that relates initial velocity (u), final velocity (v), acceleration (a), and time (t) is:
v = u + at
Substituting the known values results in:
25.00 m/s = 16.67 m/s + (2.0 m/s²)t
By rearranging the equation, we can solve for t:
t = (25.00 m/s - 16.67 m/s) / 2.0 m/s²
t = 4.17 s
Therefore, the car requires 4.17 seconds to accelerate from 60 km/h to 90 km/h given a constant acceleration of 2.0 m/s².
in the design a thermos lab, you compared the temperature of your thermos with a container that you did not insulate. what was the container for?
In the design of a thermos lab, the container that is used for comparison purposes with the thermos is typically an uninsulated container or a regular open container. This is done to demonstrate the effectiveness of the insulation in the thermos and highlight its ability to retain heat or cold compared to a container without insulation.
Purpose of uninsulated container
By checking the temperature of the thermos and the uninsulated container, you can see how heat moves differently between them. The thermos keeps drinks hot or cold for a long time because it doesn't let heat get in or out easily. But a regular container lets heat in and out more easily.
This comparison shows how well the thermos can keep drinks hot or cold for a long time. It says it's important to use insulation to stop heat from escaping, and it shows how using a thermos can keep things at the right temperature for longer.
What do wind and moving water have in common? Select one: They both have electrical energy They both have elastic potential energy They both have electromagnetic energy (light) They both have kinetic energy
Wind and moving water both have kinetic energy, which is the energy an object has due to its motion. This energy can be harnessed to produce electricity, for example, in wind turbines and hydroelectric plants.
Explanation:What wind and moving water have in common is that they both have kinetic energy. Kinetic energy is the energy an object possesses due to its motion. Wind, being moving air, possesses kinetic energy as it has mass and velocity. The same applies to moving water. Whether in the form of a running stream or waves in the ocean, the moving water particles possess kinetic energy due to their motion.
For instance, kinetic energy is the type of energy harnessed by wind turbines and hydroelectric plants. Wind turbines use the kinetic energy in wind to turn the blades of the turbine, which generates electricity. Similarly, hydroelectric plants use the kinetic energy of moving water to turn a turbine and generate electricity.
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the impulse given to a ball with massb of 2kg is 16 Ns. if the ball starts grin the rest, what is its final velocity?
A) 8ms
B) 30ms
C) 32ms
Calculate the kinetic energy of an 84-kg scooter moving at 18 m/s .
Answer:
13608 joules
Explanation:
We are given that mass of scooter=84 kg
Speed of scooter=18 m/s
We have to calculate the kinetic energy
We know that formula of kinetic energy
[tex]K.E=\frac{1}{2}mv^2[/tex]
Substitute the values then we get
K.E=[tex]\frac{1}{2}\times 84\times (18)^2=13608 joules[/tex]
Hence, the kinetic energy of an scooter=13608 joules
You drop a ball from a height of 2.0 m, and it bounces back to a height of 1.5 m. (a) what fraction of its initial energy is lost during the bounce? (b) what is the ball's speed just as it leaves the ground after the bounce? (c) where did the energy go?
a) At a position of 2.0m, the Initial energy is
all made up of the potential energy=m*g*hi
and meanwhile at 1.5 all its energy is also potential energy=m*g*hf
The percentage of energy remaining is E=m*g*hi/m*g*hf x 100
and since mass and gravity are constant so it leaves us with
just E=hi/hf
which 1.5/2.0 x100= 75% so we see that we lost 25% of the
energy or 0.25 in fraction
b) Here use the equation vf^2=vi^2+2gd
where g is gravity, vf is the final velocity and vi is the
initial velocity while d is the distance travelled
so in here we are looking for the vi so let us isolate that
variable
we know that at maximum height or peak, the velocity is 0 so
vf is 0
therefore,
vi =sqrt(-2gd)
vi =sqrt(-2x-9.81x1.5)
vi =5.4 m/s
c) The energy was converted to heat due to friction with the
air and the ground.
how can we help people who are suffering from depression or metal illnesses
Answer:
Being nice and being their for them and making sure that they are never alone. Talk to them and make them feel safe.
Explanation:
while flying over the grand canyon the pilot
Calculate the acceleration of a 25 kg object that has move the force of 300 n
The force on the body of mass 25 kg is 300 N then the acceleration of the body will be equal to 12 m/s².
What is acceleration?The rate of change in an object's velocity with respect to time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.
Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is a vector quantity as well. The definition of acceleration is the change in velocity vector over a time interval divided by the time interval.
As per the information given in the question,
Force, F = 300 N
Mass, m = 25 kg
Use the formula of force,
F = ma
300 N = 25 × a
a = 300/25
a = 12 m/s²
Therefore, the acceleration is 12 m/s².
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the distance between two cities is 300 kilometers. is this longer or shorter than 200 miles?
The angle a vector makes with the x-axis of a coordinate system must be what size in order to make one or more of its components negative?
A)less than 30 degrees
B)between 30 and 60 degrees
C)between 61 and 90 degrees
D)greater than 90 degrees
If your mass is 20kg, and you stand on the scale (witch is your force), and the acceleration due to gravity is10m/s^2, what does the scale says your weight is?
Answer:
[tex]\Huge \boxed{\mathrm{200 \ N}}[/tex]
Explanation:
[tex]\sf Weight \ (N)= mass \ (kg) \times acceleration \ of \ gravity \ (m/s^2)[/tex]
[tex]W=mg[/tex]
Your mass is 20 kg.
The acceleration of gravity is approximately 10 m/s².
[tex]W=20 \times 10[/tex]
[tex]W=200[/tex]
Your weight is 200 N.
Which of the following is most likely to be attracted to a magnet? A. A piece of glass B .A piece of plastic C .A stainless-steel paper clip D .A wet newspaper
what type of wave is a sound wave
A.transverse wave
B.longitudinal wave
C. light wave
D. elctromatic wave
Answer:
What wave is a sound wave?
For a sound wave traveling through air, the vibrations of the particles are best described as longitudinal. Longitudinal waves are waves in which the motion of the individual particles of the medium is in a direction that is parallel to the direction of energy transport.
Explanation:
Which is a correct example of the principle of conservation of momentum? A) reversing of a car at a dead end B) conversion of radio waves to sound C) deforming of a balloon on being burst D) bouncing of a basketball off the board
A correct example of the principle of conservation of momentum is the bouncing of a basketball off the board. Therefore, option D is correct.
What is momentum ?As momentum depends on both velocity and the direction of the body's motion, it is quantified by "mass velocity". Since velocity is a vector and mass is a scalar, momentum is a vector quantity. Mass times speed equals momentum.
"The motion of an item equal to the product of its mass and its velocity" is referred to as momentum. When something is said to have momentum, it refers to its unique mass and direction of motion.
Here, we offer a few more ideas that will help us describe motion in the future. Before Newton, the French scientist and philosopher Descartes introduced the first of them, called momentum.
Thus, option D is correct.
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List the following organisms in order of ascending size; bacteria, human sperm, red blood cell, virus, and lymphocyte?
The force that pulls objects toward each other
Final answer:
Gravity is the force that pulls objects toward each other, always acting to bring masses together. It is determined by the mass of the objects, with larger objects exerting stronger gravitational pulls. This force is vital in everyday phenomena and in the broader understanding of the universe.
Explanation:
The force that pulls objects toward each other is known as gravity. This fundamental force is omnipresent in nature, always acting in an attractive manner between two objects. The strength of gravitational pull is directly related to an object's mass; therefore, the larger an object, the stronger its gravitational pull. Unlike other forces that can push objects apart, gravity uniquely pulls them together. It's important to note that every object with mass in the universe exerts a gravitational pull on every other mass, a principle crucial in understanding the cosmic ballet of celestial bodies, as well as the everyday phenomenon of objects falling towards the Earth.
Gravity's effect is evident in daily experiences, such as why we stay grounded on Earth and not drift off into space. The understanding of gravity also plays a crucial role in designing structures and in aerospace engineering, where gravitational forces must be accounted for. The gravitational force is consistent with Newton's third law, indicating that the force experienced between two objects due to gravity is equal in magnitude and opposite in direction, aligning along a line joining the centers of mass of the two bodies involved.
Which of the fundamental forces pulled together hot, dense areas of matter in the early universe to begin the process of star formation?
The Gravitational force pulled together areas of matter in the early universe to begin the process of star formation.
Fundamental ForcesThe four fundamental forces that work in the universe are given below.
The strong force, The weak force, The electromagnetic force The gravitational force.These fundamental forces have different strengths and they work over different ranges and directions.
The gravitational force operates on all objects of the universe in the infinite range. Gravitation is the most important of the four fundamental forces for astronomical objects over astronomical distances for two reasons.
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What is the relationship between the speed of light and the index of refraction of a transparent substance?