3700000 no problem ok
How does the paint on a car help to keep it from rusting?
Because the paint over the iron of the car helps to keep the iron from coming in contact with air, and that's why cars in junkyards are usually rusted, because the paint is chipped or gone.
Iron rusts because it can be contacted by water-or the moisture in the air- and the metal takes the oxygen from the water forming iron oxide-rust. Paint or plating (like chrome plating) prevents the H2O molecules from reaching the surface of the metal so it can't get the oxygen.
a dog has a mass of 13kg
a. how much does the dog weigh on earth (g=9.8m/s2)?
b. what is the mass of the dog on the moon?
c. how much does the dog weigh on the moon (g=1.6m/s2)?
d. why is g different for the moon and the earth?
A: w=mg w=13(9.8) w= 127.4
B: 13kg
C: w=mg w=13(1.6) w= 20.8
D: The force of gravity is less on the moon than on earth therefore making the dog weigh less.
The dog weighs 127.4N on Earth and 20.8N on the Moon while its mass remains a constant 13kg in both places. The difference in weight is because of the difference in gravitational pull, with Earth having a larger 'g' value due to its greater mass than the Moon.
Explanation:a. The dog's weight on Earth can be calculated by the formula w = mg, where m is mass and g is gravity. Thus, it weighs 13kg × 9.8m/s² = 127.4N on Earth.
b. The mass of an object is constant, regardless of location. So, the mass of the dog on the Moon is still 13kg.
c. The dog's weight on the moon can be calculated with the same formula, but using the Moon’s gravity. Thus, it weighs 13kg × 1.6m/s² = 20.8N on the Moon.
d. The acceleration due to gravity, 'g', is different for the Earth and the Moon because it depends on the size and mass of the celestial body. The Earth has a much greater mass than the Moon, resulting in a greater gravitational pull and hence a larger value for 'g'.
Learn more about Gravity and Weight here:https://brainly.com/question/2124323
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A block of mass 8.0 kg is held stationary on a slope whose surface is inclined 31 degrees relative to the horizontal.
When released it slides down the slope with a constant acceleration of 0.9 ms^-2.
Using your knowledge of forces, calculate the surface's coefficient of friction, μ. Assume g = 9.8 ms^-2.
Answer:
0.49
Explanation:
There are two forces acting on the block in the direction parallel to the surface of the inclined plane:
- The component of the weight of the block parallel to the incline:
[tex]mg \sin \theta[/tex]
where m = 8.0 kg is the mass of the block, g=9.8 m/s^2 and [tex]\theta=31^{\circ}[/tex] is the angle of the ramp
- The frictional force, given by:
[tex]\mu mg cos \theta[/tex]
where [tex]\mu[/tex] is the coefficient of friction.
The two forces act in opposite direction, and according to Newton's second law, their resultant is equal to the product of the mass of the block (m) and its acceleration (a):
[tex]mg sin \theta - \mu mg cos \theta = ma[/tex]
Since we knw that [tex]a=0.9 m/s^2[/tex], we can re-arrange the equation to find the coefficient of friction:
[tex]\mu = \frac{g sin \theta -a}{ g cos \theta}=\frac{(9.8 m/s^2)(sin 31^{\circ})-0.9 m/s^2}{(9.8 m/s^2)(cos 31^{\circ})}=0.49[/tex]
A stunt car with a mass of 1000 kg crashes into a tree on a movie set during the collision acceleration of the car with 3 m what was the force of impact of the collision on the car
F=m•a=1000•3=3000 N=3kN
The force of impact during the collision of a stunt car with a tree, given a mass of 1000 kg and an acceleration of 3 m/s^2, is 3000 Newtons (N), calculated using Newton's second law of motion.
Explanation:To find the force of impact of the collision on a stunt car that crashes into a tree, we can use Newton's second law of motion, which states that the force acting on an object equals its mass times its acceleration (F = ma). In this case, the mass (m) of the car is given as 1000 kg, and the acceleration (a) during the collision is mistakenly referred to as '3 m', which seems like a typo for '3 m/s2'. Assuming the acceleration is indeed 3 m/s2, the calculation would be:
F = 1000 kg × 3 m/s2 = 3000 N.
Hence, the force of impact during the collision would be 3000 Newtons (N). This calculation essentially applies Newton's second law to determine the net force acting on the car due to its acceleration towards the obstacle (in this case, a tree), providing a fundamental understanding of the dynamics involved in car crashes.
1. Is this graph exponential growth or exponential decay? Explain why.
2. On what swing did the pendulum's maximum height dip below 1 in. for the first time?
1). This graph reveals exponential decay. As time goes on (moving left to right across the graph), the maximum excursion of the pendulum's swing becomes smaller and smaller. On a graph of exponential growth, it would get larger and larger as time goes on.
2). The first time the pendulum's maximum height dipped below 1 inch was on the 4th swing.
Answer:
4 swings
Explanation:
An isotope has the same number of but a different number of than other atoms of the same element.
1. protons 2. neutrons
Answer:
protons
neutrons
Explanation:
A 3kg object moving at 15 m/s what is the momentum
p=m•v=3•15=45 kg•m/s
What determines the mass of an object
Answer:
Mass is a fundamental property of the object. The mass of an object is a measure of objects resistance to acceleration, sometime also called "Inertia".It is a numerical measure of its inertia. Mass measured by using balanceKatlyn makes a gelatin dessert. She pours hot water into the flavored gelatin powder and stirs. What are the solute and solvent in this solution? A. Heat is the solute. Gelatin powder is the solvent. B. Gelatin powder is the solute. Heat is the solvent. C. Water is the solute. Gelatin powder is the solvent. D. Gelatin powder is the solute. Water is the solvent.
Katlyn pours hot water into the flavored gelatin powder and stirs.
Gelatin powder is the solute. Water is the solvent. (D)
The correct answer is D. Gelatin powder is the solute and water is the solvent in the gelatin dessert that Katlyn makes. Water is the component in the larger amount and is responsible for dissolving the gelatin powder.
When Katlyn makes a gelatin dessert, she is creating a solution by mixing two substances. In this context, the gelatin powder is the solute, which is the substance that gets dissolved, and the hot water is the solvent, which is the substance that does the dissolving. Therefore, the correct answer to the question is D. Gelatin powder is the solute. Water is the solvent.
Solvents are typically the component of a solution that is present in the larger amount and usually determines the phase (solid, liquid, or gas) of the solution. In Katlyn's case, the solvent - water - is a liquid, which then forms a gel upon cooling, as the dispersed gelatin molecules create a three-dimensional network in the cooled dessert.
A 12kW motor moves a 1000kg car at what constant velocity, if the motor applies a force that equals 2000N? Also, of the motor for 2.75s, what amount of work has the motor done on the car. (Show working out)
Given data
Power = 12 KW ,
mass (m) = 1000 kg ,
Force (F) = 2000 N ,
time (t) = 2.75 s
Determine
1. Velocity (v) = ?
2. Work (W) = ?
We know that Power (P) = Rate of doing work
= ( Work ÷time) KW
Also we know that Work = F × displacement
Force = m.a N
=> 2000 = 1000 × a
=> a = 2 m/s²
And we know that acceleration (a) = rate of change of velocity
= v ÷ t
=> v = a × t
= 2 × 2.75
= 5.5 m/s
Now determine the Power P = Work done ÷ time
12 = W ÷ 2.75
W= 12 ×2.75
= 33 KJ
= 33000 J
A barrel 1 m tall and 60 cm in diameter is filled to the top with water. What is the pressure it exerts on the floor beneath it? What could you do to reduce this pressure without removing the water?
Answer:
The pressure on the ground is about 9779.5 Pascal.
The pressure can be reduced by distributing the weight over a larger area using, for example, a thin plate with an area larger than the circular area of the barrel's bottom side. See more details further below.
Explanation:
Start with the formula for pressure
(pressure P) = (Force F) / (Area A)
In order to determine the pressure the barrel exerts on the floor area, we need the calculate the its weight first
[tex]F_g = m \cdot g[/tex]
where m is the mass of the barrel and g the gravitational acceleration. We can estimate this mass using the volume of a cylinder with radius 30 cm and height 1m, the density of the water, and the assumption that the container mass is negligible:
[tex]V = h\pi r^2=1m \cdot \pi\cdot 0.3^2 m^2\approx 0.283m^3[/tex]
The density of water is 997 kg/m^3, so the mass of the barrel is:
[tex]m = V\cdot \rho = 0.283 m^3 \cdot 997 \frac{kg}{m^3}= 282.151kg[/tex]
and so the weight is
[tex]F_g = 282.151kg\cdot 9.8\frac{m}{s^2}=2765.08N[/tex]
and so the pressure is
[tex]P = \frac{F}{A} = \frac{F}{\pi r^2}= \frac{2765.08N}{\pi \cdot 0.3^2 m^2}\approx 9779.5 Pa[/tex]
This answers the first part of the question.
The second part of the question asks for ways to reduce the above pressure without changing the amount of water. Since the pressure is directly proportional to the weight (determined by the water) and indirectly proportional to the area, changing the area offers itself here. Specifically, we could insert a thin plate (of negligible additional weight) to spread the weight of the barrel over a larger area. Alternatively, the barrel could be reshaped (if this is allowed) into one with a larger diameter (and smaller height), which would achieve a reduction of the pressure.
How are the energy of infrared, visible light and ultraviolet rays related? And why?
The different types of radiation are defined by the the amount of energy found in the photons. Radio waves have photons with low energies, microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and, the most energetic of all, gamma-rays
hope this helps change it up a little
The energy of these spectral bands are related through the Einstein-Planck formula:
E = h * f
with h the Planck's constant and f the frequency of the electromagnetic wave.
Since the (frequency of infrared) is < (frequency of visible) < (frequency of ultraviolet), from the Einstein-Planck relationship it follows that the (energy of infrared) < (energy of visible) < (energy of ultraviolet).
at what temperature (in K) will 1.0 mol of gas occupy 1.0 m3 at a pressure of 1.0 * 10^4 pa
ideal gas equation ...pv=nrT ... n=2 ... r is gas constant T=10^4x1/8.3
Liquid water first appears after _______ minutes? A) 1 B) 3 C) 16.5 D) 19
Answer B) 3
Explanation:
One Newton is expressed in ?
Answer:
It is the SI unit of force.
Explanation:
The rate of change of momentum in the body is directly proportional to the force applied on the body. It is the second law of motion.
The mathematical form of Newton's second law is
F = m x a
where, m is the mass and a be the acceleration.
If a body of mass 1 kilogram having an acceleration of 1 m/s^2, it means the force applied on the body is 1 newton.
how do kinetic energy,gravitational potential energy and heat due to friction change as the marble rolls down the ramp
I SERIOUSLY can't do this type of questions so can someone solve it detailedly and putting with letters (there is a system you name conducting wires as A, B etc. I don't know what that system calls in physics)
Find the equivalent resistance with details
Answer:
4 Ohms
Explanation
(This is seriously not as hard as it looks :)
You only need two types of calculations:
replace two resistances, say, R1 and R2, connected in a series by a single one R. In this case the new R is a sum of the two: [tex]R = R_1+R_2[/tex]replace two resistances that are connected in parallel. In that case: [tex]\frac{1}{R}= \frac{1}{R_1}+\frac{1}{R_2}\\\mbox{or}\\R= \frac{R_1\cdot R_2}{R_1+R_2}[/tex]I am attaching a drawing showing the process of stepwise replacement of two resistances at a time (am using rectangles to represent a resistance). The left-most image shows the starting point, just a little bit "warped" to see it better. The two resistances (6 Ohm next to each other) are in parallel and are replaced by a single resistance (3 Ohm, see formula above) in the top middle image. Next, the two resistances (9 and 3 Ohm) are nicely in series, so they can be replaced by their sum, which is what happened going to the top right image. Finally we have two resistances in parallel and they can be replaced by a single, final, resistance as shown in the bottom right image. That (4 Ohms) is the equivalent resistance of the original circuit.
Using these two transformations you will be able to solve step by step any problem like this, no matter how complex.
The Use of force to move an Object is called ?
Awnser: Work
Explanation:
work is the act of using force
Laurie is moving a dresser with a mass of 250 kg. She does 126 J of work with a force if 14 N. How far does she move the dresser?
Answer: 9 m
Explanation:
Work is said to be done when an unbalanced force causes displacement of the body.
Force is the product of mass (m) and acceleration (a).
Work = Force × Displacement
⇒W = F.s = ma.s
It is given that mass of the dresser is, m = 250 kg
work done, W = 126 J
Force acting on the dresser, F = 14 N
we need to find displacement, s
⇒126 J = 14 N × s
⇒ s = 126 J/ 14 N = 9 m
Hence, Laurie is able to move the dresser to about 9 m.
Answer:
9 m
Explanation:
When an object moves or displaces along the direction of the applied force application of force, it is said that work is done.
We know the formula of work:
Work = force x displacement
where force = mass x acceleration
So this formula can be further broken down to :
Work = mass x acceleration x d
Putting in the given values to get:
126 = 14 x d
d = 126/14
d = 9 m
Therefore, the dresser was moved by 9m.
Which of the following explains why tides occur every 12 hours and 25 minutes?
A. Variations in the land and depth of water make the tides uneven.
B. It takes 24 hours and 50 minutes for the earth to make a complete rotation.
C. Early scientists misunderstood how to calculate tides, and their error persists to this day
D. In some seasons, the rotation of the earth is slower than others, requiring additional time.
Answer : B
A lunar day is the time it takes a specific site on the earth to rotate from exact point under the moon to the same point. Unlike the solar day, a lunar day is 24 hours 50 minutes. the lunar day is 50 minutes longer than the solar day because the moon revolves around the earth in the same direction that the earth rotates around its axis. So it takes the earth an extra 50 minutes to catch up.In lunar day coastal areas experience two high and two low tides every 24 hours and 50 minutes. High tides occur every 12 hr 25 minutes apart.Final answer:
The reason why tides occur every 12 hours and 25 minutes is that the Earth takes 24 hours and 50 minutes to align again with the Moon due to the Moon's orbit, requiring Earth to rotate a bit more each day. Option B is the correct answer.
Explanation:
Tides occur due to the gravitational pull primarily of the Moon and, to a lesser extent, the Sun on Earth's oceans. High tides occur approximately every 12 hours and 25 minutes. This is because the Moon takes 24 hours and 50 minutes to rotate once around the Earth, meaning the Earth has to rotate a little bit more each day to align with the Moon again. Since tides occur twice a day, the extra time divided by two gives us the 12 hours and 25 minutes between successive high tides.
The correct answer to why tides occur every 12 hours and 25 minutes is that the Earth has to rotate an additional distance for a location to re-align with the Moon's position due to the Moon's orbit around Earth. Therefore, option B is correct: It takes 24 hours and 50 minutes for the Earth to make a complete rotation relative to the Moon.
The latent heat of vaporization for ethyl alcohol is 854 J/g. The amount of energy, rounded to the nearest whole number, needed to change 5.20 grams of ethyl alcohol from a liquid to a gas is J.
Answer:
4441 J
Explanation:
The amount of energy needed to change the ethyl alcohol from liquid to gas state is given by
[tex]Q=m \lambda_v[/tex]
where
m = 5.20 g is the mass of the alcohol
[tex]\lambda_v = 854 J/g[/tex] is the latent heat of vaporization of the substance
Substituting the numbers into the formula, we find:
[tex]Q=(5.20 g)(854 J/g)=4,441 J[/tex]
Answer:
4441
Explanation:
A collision in which kinetic energy is transferred only as kinetic energy from one object to another and is not converted in any other amount to any other form of energy
A static friction.
B kinetic energy
C elastic collision
D bouyant force
C. Elastic collision. A perfect elastic collision is on that doesn't result in any k.e loss during the collision.
Elastic collision is the correct answer C.
Name and briefly describe the two types of interference
The two types of wave interference are constructive and destructive.
These both describe what happens when waves combine
Constructive interference is when 2 waves combine to form a wave with a larger amplitude, but this is only if both waves are both positive or both negative.
Destructive interference is when the two waves are opposite, one is negative, one is positive. They subtract forming the combined wave that has a lower amplitude.
I hope that helps u out!! :)
At 16, Juana is at an appropriate weight and likes to eat whatever she wants to. What's the best strategy to ensure Juana's health? A. start paying attention to her diet so she won't gain weight later and walk once a day B. get in the habit of eating food high in nutrients and engage in regular physical activity C. reduce her calorie intake to 1,800 per day and take up an aerobic sport like soccer
B
Let me know if I'm correct
I'm pretty sure it's B
How fast would you have to launch a ball at 45 degrees above the horizontal to reach a height of 49 meters in the air? [Must show work]
Let say the ball is projected in air with speed "v" at an angle of 45 degree
now the two components of its velocity will be given as
[tex]v_x = vcos45 = 0.707 v[/tex]
[tex]v_y = vsin45 = 0.707 v[/tex]
now the maximum height reached by the ball is 49 m
so as it will reach to maximum height its velocity in y direction will become zero
so we can use kinematics in y direction
[tex]v_f^2 - v_i^2 = 2 a y[/tex]
[tex]0 - (0.707v)^2 = 2(-9.8)(49)[/tex]
[tex]0.5v^2 = 960.4[/tex]
[tex]v = 43.8 m/s[/tex]
so the speed with which ball is projected upwards must be 43.8 m/s
iron is much denser than a feather. yet a particicular sample of fathers weighs more than a simple of iron. explain how this is possible
Final answer:
A steel needle or paper clip can float on the surface of water even though steel is denser than water. This is due to surface tension, which creates an upward force that counteracts the force of gravity.
Explanation:
Although steel is denser than water, a steel needle or paper clip placed carefully lengthwise on the surface of still water can be made to float. This is possible because of a phenomenon called surface tension. Surface tension is the force that acts on the surface of a liquid and tends to minimize its area.
When a small object like a steel needle or paper clip is placed on the surface of water, the surface tension of the water molecules pulls on the object from all sides, creating an upward force that counteracts the force of gravity. As a result, the object floats on the surface of the water.
This demonstrates that density alone does not determine whether an object will float or sink. Other factors, such as surface tension, can play a significant role in determining whether an object will float or sink.
if you throw a ball at 35° and 10 m/s what is the horizontal component of velocity
0.0m/s
10m/s
5.7m/s
8.2m/s
Answer:
8.2 m/s
Explanation:
The horizontal component of the velocity is given by:
[tex]v_x = v cos \theta[/tex]
where
v = 10 m/s is the magnitude of the velocity
[tex]\theta=35^{\circ}[/tex] is the angle at which the ball has been thrown, with respect to the horizontal
Substituting the values into the equation, we get
[tex]v_x=(10 m/s)(cos 35^{\circ})=8.2 m/s[/tex]
Final answer:
The horizontal component of velocity of a ball thrown at 35° and 10 m/s is 8.2 m/s.
Explanation:The horizontal component of the velocity of a ball thrown at an angle of 35° and a speed of 10 m/s can be found using trigonometry. The horizontal component is given by the formula:
Horizontal velocity (Vx) = Initial velocity (V0) * cos(angle)
Substituting the given values:
Vx = 10 m/s * cos(35°)
Vx ≈ 10 m/s * 0.819
Vx ≈ 8.19 m/s
Therefore, the horizontal component of velocity is approximately 8.2 m/s.
What is the wavelength of the wave above?
A- 0.75 cm
B- 1.5 cm
C- 2.5 cm
D- 3.5 cm
Answer ; 2.5 (C)
From the given figure it is cleat that the wave length (λ) = 2.5 cm
It is a "measure of distance between two identical crests or identical troughs in a wave.
In the figure, high points are crests and low points are troughs.
A lamp is 10% efficient.How much electrical energy must be supplied to the lamp each second if it produces 20 J of light energy per second?
If it produces 20J of light energy in a second, then that 20J is the 10% of the supply that becomes useful output.
20 J/s = 10% of Supply
20 J/s = (0.1) x (Supply)
Divide each side by 0.1:
Supply = (20 J/s) / (0.1)
Supply = 200 J/s (200 watts)
========================
Here's something to think about: What could you do to make the lamp more efficient ? Answer: Use it for a heater !
If you use it for a heater, then the HEAT is the 'useful' part, and the light is the part that you really don't care about. Suddenly ... bada-boom ... the lamp is 90% efficient !
The lamp is 10% efficient which means it converts only 10 % of its input energy into output. Hence, it will produce 20 J/s when an energy of 200 J/s is applied.
What is electrical energy?Electrical energy is a form of energy generated by the movement of free electrons from the valence band to the conduction band. Electrical energy can be converted to other forms of energy such as light energy, mechanical energy etc.
The efficiency of an electric device is its ratio of the input energy to the output energy. No device can be 100 % efficient because the a significant portion of the applied energy is lost in the form of heat energy.
Given that the efficiency of the lamp is 10%. Thus, it converts only 10 % of its input energy to the output. The output energy is 20 J/s. Which is 10% of 200J/s. Therefore, the energy applied here is 200 J/s.
To find more on energy efficiency, refer here:
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List examples of foliated and non-foliated rocks. Explain the difference between the two types of metamorphic rocks.
Non-foliated metamorphic rocks are rocks that have been changed by heat and pressure into rocks with a non-layered or banded appearance. Some examples of non-foliated metamorphic rocks include quartzite, marble, amphibolite and hornfels.
Non-foliated metamorphic rocks are rocks that have been changed by heat and pressure into rocks with a non-layered or banded appearance. Some examples of non-foliated metamorphic rocks include quartzite, marble, amphibolite and hornfels.