The coefficient of kinetic friction is independent of an object's weight and depends on the two contact surfaces. Actual frictional force increases with weight due to its dependence on the normal force. Weight influences the tension in a string due to the effect of friction on net force.
Explanation:The coefficient of kinetic friction (μk) is a value that describes how much frictional resistance is encountered by two surfaces sliding past one another. It is independent of the weight of the block and solely depends on the properties of the two contact surfaces. However, the actual frictional force, which is the product of the coefficient of kinetic friction and the normal force, does depend on the weight of the block because the normal force is equal to the weight of the block when the block is on a horizontal surface.
Given the mass (M) of the larger block and the force (F), you are looking to find the tension in the string that connects it to another block. The kinetic friction value affects the calculation of the net force and therefore influences the tension in the string.
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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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
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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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.
True or false when matter changes state, its chemical properties change
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
Which substance is an example of an element? bronze copper methane rust
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
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.
List the following organisms in order of ascending size; bacteria, human sperm, red blood cell, virus, and lymphocyte?
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.
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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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:
In the four-stroke internal combustion engine, fuel is ignited during the ____ stroke.
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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What is the relationship between the speed of light and the index of refraction of a transparent substance?
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.
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
“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 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 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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Which is a drawback to the use of oil shale to produce energy
the distance between two cities is 300 kilometers. is this longer or shorter than 200 miles?
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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What did Galileo discover when he dropped 2 cannon balls of different weights from the leaning tower of pisa
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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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.
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.
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
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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