Answer:
C.
Explanation:
Fahrenheit scale is a temperature scale that measures the boiling point of water at 212 degrees F and the freezing point at 32 degrees F. The Fahrenheit scale was developed by the German scientist Daniel Gabriel Fahrenheit in 1724.
In the given scenario, the scientist, who wishes to measure the temperature of her experiment which will expectantly be colder than the point of water, should use the Fahrenheit scale.
So, the correct answer is option C.
a submarine is observed to rise from a real depth of 80 m to 60 m in water calculate the change in apparent depth
Answer:
15m
Explanation:
change in real depth = 80 - 60 = 20m
Let us assume that the index is 4/3
Refractive index = change in real depth ÷ change in apparent depth
change in apparent depth = change in real depth÷ refractive index
= 20÷(4/3) = 20×(3/4) = 5×3 = 15m
How is the kinetic energy of molecules changing when the molecules move faster? The kinetic energy . . .
Answer:
Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles. With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates and an increased rate of diffusion
Explanation:
How would the elastic potential energy change if the displacement is multiplied by five?
Answer: Work is done when a spring is extended or compressed . Elastic potential energy is stored in the spring. The elastic potential energy stored can be calculated using the equation: elastic potential energy = 0.5 × spring constant × (extension) 2.
Explanation: can you please mark me as brainliest
2 Select the correct answer. How many points are awarded for a soccer goal? OA. OB. 2 OC. 3 O D. 7
Answer: oa
Explanation:
A 60 W bulb is supplied with 36 000 j of energy how long is the bulb on for
Answer:
Time = 600 seconds
Explanation:
Given the following data;
Power = 60W
Energy = 36000
To find the time;
Energy = power * time
Substituting into the equation, we have;
36000 = 60 * time
Time = 36000/60
Time = 600 seconds.
Therefore, the bulb was on for 600 seconds.
ASAP Will give brainlist . As a scientists have learned more about atoms , models of atoms have changed. One of the first atomic was a solid ball , such as a marble .
What are two limitations of using a marble to model an atom?
A - The model is not made of commonly available materials or objects.
B - The model does not move or behave like a real atom.
C - The model does not show the true size of an atom.
D - The model is much harder to see than a real atom.
Answer:
B - The model does not move or behave like a real atom.
Explanation:
The solid ball does not show how the nucleus is composed of protons and neutrons, or the relationship between the electrons and the nucleus.
Calculate the average speed of a toy car that travels 20m in 40s
Answer:
2 per s
Explanation:
divid 40 and 20 it gives you = 2
Answer:
2m in 4s
Explanation:
A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)
3.9 m
4.0 m
39.2 m
40.0 m
Answer:
The answer is 4.0 m
Explanation:
Answer:
B) 4.0
Explanation:
Jus took the test on E D G E
Electromagnetic Field concept was observed and discovered by whom?
Answer:
James Clerk Maxwell
Who observed and discovered the electromagnetic field concept? Many physicists experimented with electromagnetic fields, but it was James Clerk Maxwell who discovered that they are actually electromagnetic in nature and they (at the classical level) are accurately described by his famous equations.
Explanation:
A force of 90.0 newtons is applied to a cart traveling at 15.0 meters per second. After
the force has been applied for 2.00 seconds, it comes to rest. What is the magnitude
of the impulse applied to the cart over these 2.00 seconds?
Answer:
180Ns
Explanation:
Given parameters:
Force applied = 90N
Velocity = 15m/s
Time taken = 2s
Unknown:
Impulse applied to the cart = ?
Solution:
The impulse is effect of force acting on a body through time.
It is mathematically expressed as;
Impulse = Force x time
So;
Impulse on the car = 90 x 2 = 180Ns
A student rides the Ferris wheel when visiting an amusement park. During the ride,
she moves at a constant speed of 3 m/s.
Which of the following statements best describes the motion of the student on the
Ferris wheel?
Answer: the velocity is not changing bc the speed is constant
Explanation:
A student rides the Ferris wheel when visiting an amusement park. She moves at a constant speed of 3 m/s which means that the velocity is not changing because the speed is constant.
What are Average Speed and Average Velocity?The overall distance the object covers in a given amount of time is its average speed. The scalar quantity represents the average speed. It does not have direction; it is represented by magnitude.
Average Speed = [tex]total\ distance/total\ time[/tex]
Average velocity is a vector quantity. The change in position or displacement divided by the periods during which the displacement happens is known as average velocity. Depending on how the displacement is displaced, the average velocity may be positive or negative. Meters per second (m/s), the SI unit of average velocity, is used.
According to the question, she is moving at a constant speed of 3 m/s means that the velocity is constant, and its acceleration will also be equal to zero because there is no change in velocity then acceleration is zero.
To get more information about average speed and Average Velocity :
https://brainly.com/question/12322912
#SPJ5
if a 580 N net force acts on a 40 kg what will the acceleration of the car be
Answer:
I think u have to do 580N times 40KG
Answer: DONT MULTIPLY, YOU DIVIDE THEM
Explanation:
F = mass x acceleration
580 N = (40 kg)(a)
580/40 = 14.5
a = 14.5 m/s²
Pls help I really need help w this one Tnks
Nikolas, the fire extinguisher, and the skateboard have a combined mass of 50 kg. What force would the fire extinguisher have to produce to propel Nikolas if he wanted to accelerate at a rate of 1.2 m/s2? Round your answer to the nearest whole newton.
Answer:
60N
Explanation:
Given parameters:
Combined mass = 50kg
Acceleration = 1.2m/s²
Unknown:
Force to propel = ?
Solution:
From Newton's second law of motion, we know that;
Force = mass x acceleration
So;
Force = 50 x 1.2 = 60N
Answer:
60N
Explanation:
A wave with a frequency of 32 Hz has a wavelength of 9 meters. At what speed will this
wave travel?
Answer:
228 m/s
Explanation:
f = 32 Hz
λ = 9 m
v = ?
v = f λ
v = (32 Hz) (9 m)
v = 288 m/s
Emma is doing a laboratory experiment to separate components of crude oil. She decides to use a technique that will separate the components
based on their boiling points. Which technique uses this principle?
A filtration
B. distillation
OC centrifugation
OD. chromatography
E.
titration
Answer:
B. distillation
Explanation:
The technique that will separate the components of crude oil based on their boiling points is distillation.
Fractional distillation is the approach used by oil industries to separate the different components of crude oil.
The components of the crude are called fraction. Sufficient amount of heat is applied to the crude in the fractionating column. As the boiling point of each constituent is attained, they rise as vapor in the column The vapor is channeled to the cooling part where the fraction is cooled and collected.5. It takes you 5 hours to complete a 375-kilometer trip. What was your average speed on this trip?
Answer:
the average speed on this trip is 75 km/h
Answer:
75 km/h
Explanation:
what energy does a car have when you fill it up
Answer:
mechanical energy
Explanation:
Answer:
When you fill it up its chemical energy but it gets transformed into mechanical energy.
Explanation:
The internal combustion engine, which is utilized in most automobiles, has allowed for the transfer of chemical energy into mechanical energy. This provides locomotion for the vehicle as it is driving.
A block is on a surface with µs=0.276. It takes 1.11 N to break it free from static friction. What is the mass of the block?
Answer:
0.407 kg
Explanation:
Given :
Coefficient of static friction, µs = 0.276
Force, F = 1.1 N
Using the relation :
μ = F/N
N = normal reaction ; N = mg
μ = F / mg
g = acceleration due to gravity = 9.8 m/s²
0.276 = 1.1 / m * 9.8
0.276 = 1.1 / 9.8m
0.276 * 9.8m = 1.1
2.7048m = 1.1
m = 1.1 / 2.7048
m = 0.4066844
Mass = 0.407 kg
If the force of a 10 kg car traveling in a circular path is 900n and the circle has a diameter of 20 m what is the velocity of the car
Answer:
the velocity of the car is 30 m/s.
Explanation:
Given;
Centripetal force on the car, F = 900 N
mass of the car, m = 10 kg
diameter of the circular path, d = 20 m
radius of the circular path, r = 10 m
The velocity of the car is calculated as follows;
[tex]F = \frac{mv^2}{r} \\\\mv^2 = Fr\\\\v^2 = \frac{Fr}{m} \\\\v = \sqrt{\frac{900 \times 10}{10} } \\\\v = 30 \ m/s[/tex]
Therefore, the velocity of the car is 30 m/s.
The force of friction between an object and the surface upon which it is sliding is 14N and the coefficient of friction between them is 0.72. What is the weight of the object?
Answer:
14 x 0.27 = 3.78 is your answer
Explanation:
the question is asking for the weight of the object so you multiply and get 3.79
a car is traveling at 20 meters/seconds anf is brought to rest by applying breaks over a period of 4 seconds. what is its average acceleration over this time in time interval
Answer:
2.5m/s²
Explanation:
Given the following:
Initial velocity u = 0m/s
Final velocity v = 20m/s
Time t = 4s
Required
average acceleration over this time in time interval
Using the equation of motion
v = u + at
10 = 0 + a(4)
10 = 4a
a = 10/4
a = 2.5m/s²
Hence its average acceleration over this time in time interval is 2.5m/s²
A train is moving with a velocity of 70 km/h.
If north is taken as the positive direction, what is the direction of movement of the train?
It is moving north but is speeding up. ,
It is moving north. ,
It is moving south.
It is moving south but is speeding up.
Answer:
B: It is moving north.
Explanation:
We are told that a train is moving with a velocity of 70 km/h.
Now, we are also told that the positive direction is north.
This means that the train is moving in the northern direction.
We can't say if it is speeding up or not because we are not given the acceleration.
Thus, option B is correct
Answer:
It is moving north.
Explanation:
I took the test.
• CHALLENGE You need to move a 105-kg sofa to a different location in the room. It
takes a 403-N force to start the sofa moving. What is the coefficient of static friction
between the sofa and the carpet?
Answer:
μ = 0.391
Explanation:
The friction force is defined as the product of the coefficient of friction by the normal force. In this way, we have the following equation.
F = μ*N
Where:
F = friction force = 403 [N]
μ = static coefficient
N = Normal force [N]
And the normal force of a body lying on a horizontal surface can be calculated by means of the product of mass by gravitational acceleration.
[tex]N=m*g\\N=105[kg]\\g=9.81 [m/s^{2} ]\\N=105*9.81\\N=1030.05[N][/tex]
Now we can clear the static coefficient
[tex]403=u*1030.05\\u=0.391[/tex]
How does the launch angle affect the maximum height reached by a ground launched projectile?
Answer:
The maximum height is determined by the initial vertical velocity. Since steeper launch angles have a larger vertical velocity component, increasing the launch angle increases the maximum height.
Explanation:
brainliest plzzzzzzzzzzzzzzz
What is the Gravitational Potential Energy of a 30kg block resting 5m above the ground?
O 150 J
O 1500 )
O 6J
O 60)
Answer:
1470J
Explanation:
Given parameters:
Mass of the block = 30kg
Height = 5m
Unknown:
Gravitational potential energy = ?
Solution:
The Gravitational potential energy of body is due to its position above the ground level.
Gravitational potential energy = mass x acceleration due to gravity x height
So;
Gravitational potential energy = 30 x 9.8 x 5 = 1470J
What is newton first law
Answer:
Newtons first law states that:
If a body is in rest or motion in a straight line, it remains at rest or at motion in a straight line with constant speed until and unless and external unbalanced force acts on it.
'This law is also known as the law of Inertia.'
A saturated solution is formed by keeping 48 gram of a salt in 200 gram of water at 35°C. calculate the solubility of the salt.
The solubility of the salt. : 24 g/100 g solvent(water)
Further explanationGiven
48 gram of a salt in 200 gram of water at 35°C
Required
The solubility of the salt.
Solution
Solubility : the amount of a substance that can be dissolved in a solvent
Can be formulated(for 100 g solution)⇒grams solute per 100 g of solvent(100 ml water)
[tex]\tt solubility=\dfrac{mass~solute}{mass~solvent}\times 100[/tex]
Input the value :
[tex]\tt solubilty=\dfrac{48~}{200~g}\times 100=24~g[/tex]
Which particle is a negatively charged ion?
A.Hydrogen (H) with 1 proton, 0 neutrons, and 1 electron
B.Sodium (Na) with 11 protons, 12 neutrons, and 10 electrons
C.Magnesium (Mg) with 12 protons, 12 neutrons, and 12 electrons
D.Chlorine (CI) with 17 protons, 18 neutrons, and 18 electrons
Answer:
option D is correct
Explanation:
cl has 17 electrons if it has 18 it becomes cl-
The particle that is negatively charged is Chlorine (CI) with 17 protons, 18 neutrons, and 18 electrons. The correct option is D.
What is an ion?An ion is a gross electrically charged molecule or atom. By convention, the charge of an electron is considered to be negative, and this charge is equal to and opposite to the charge of a proton, which is considered to be positive.
These are found in a wide range of instruments, including mass spectrometers, optical emission spectrometers, particle accelerators, ion implanters, and ion engines.
They are also used in air purification by disrupting microbes, as well as in household items such as smoke detectors, as reactive charged particles.
When particles acquire or lose electrons, ions form. Because electrons are negatively charged, losing one or more electrons causes an atom to become positively charged; gaining one or more electrons causes an atom to become negatively charged.
Thus, the correct option is D.
For more details regarding ions, visit:
https://brainly.com/question/14982375
#SPJ2
What speed would a fly with a mass of 0.638 g need in order to have 74354.5 j of kinetic energy
Answer:
v = 15,267 m/s
Explanation:
Kinetic Energy
Is the type of energy of an object due to its state of motion. It's proportional to the square of the speed.
The formula to calculate the kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where:
m = mass
v = speed
The kinetic energy is often expressed in Joules (J)
We are given the mass of a fly m=0.638 g and we need to calculate its speed in order to have a kinetic energy of 74354.5 J.
Converting:
m=0.638 g /1000 = 0.000638 kg
To find the speed, we solve the formula for v:
[tex]\displaystyle v=\sqrt{\frac{2K}{m}}[/tex]
[tex]\displaystyle v=\sqrt{\frac{2K}{m}}[/tex]
Substituting:
[tex]\displaystyle v=\sqrt{\frac{2*74354.5}{0.000638}}[/tex]
v = 15,267 m/s
(The fly should move faster than a rocket)