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Related Questions
The Sun is a star that Earth and the other planets revolve around. The Sun has a large gravitational pull. The gravitational attraction of the Sun contributes most to which of the following?
A) Motion of the planets
B) Magnetic field of the planets
C) Mass and density of the planets
D) Atmosphere of the planets
Answers
Answer:
A
Explanation:
The sun is an emits energy in the form of light and heat.
The planets absorb this energy which helps keep them in motion. The closer they are to the sun, the more energy, the more speed and less the time it takes a planet to orbit the sun.
The gravitational pull of the Sun contributes motion of the planets because here the gravitational pull of the sun is balanced by the centrifugal force produced by the revolution of planets. The correct option Is A.
What is centrifugal force?Centrifugal force is the pseudo-force that occurs only in the rotating frame of reference (non-inertial frame). it is directed away from the center. Its magnitude is,
F=\(\frac{mv^{2} }{r}\)
where m= mass of the body in kg.
v= velocity f the body in m/s.
r = radius in m.
The star sun has a gravitational pull that is about 274 m/s² which is greater than the other planets. Due to this pull the planets tend to pull toward the sun but it does not happen because the pull force is balanced by the centrifugal force that is produced by the revolution of the planets around the sun.
Hence The Sun's gravitational pull contributes to the motion of the planets.
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Explain how thermal conductivity occurs in poor conductor materials
Answers
Answer:
Poor conductor metals contain only atoms.
She on side is heated, the atoms vibrate hence passing on their vibration energy to the neighboring atoms. The process is gradual a d continuous
Explanation:
\({}\)
Which property of a substance can be determined using a pH indicator?
O acidity
OB. boiling point
Oc density
OD. electrical conductivity
OE. thermal conductivity
Answers
Answer:
Acidity
Explanation:
pH measures how acidic or basic a substance is.
Answer:
a) Acidity
More to know The pH scale is a mixture of indicator which on dissolving indicate whether the substances is acidic in nature or basic . The value between 1 to 7 is acidic The value between 7 to 14 is basic The value 7 is neutralAcids are sour in taste and turn blue litmus ( indicator) to red Base are bitter in taste and turn red litmus to blue. Salts are neutral and obtain by the reaction between acid and bases.In 2012, NASA sent the 900kg Curiosity robot to Mars to study the planet. a) Recall the relationship between the weight P and the mass m. Specify the units. b) What is the weight of Curiosty on Mars? c) Compare the weight of Curiosity on Earth and on Mars. Why is it more important on Earth
Answers
(a)The units for weight are typically expressed in Newtons (N), while mass is measured in kilograms (kg).
(b)The weight of Curiosity on Earth is approximately 8820 Newtons.
a) The relationship between weight (P) and mass (m) is given by the formula P = m * g, where g represents the acceleration due to gravity. The units for weight are typically expressed in Newtons (N), while mass is measured in kilograms (kg).
b) To calculate the weight of Curiosity on Mars, we need to determine the acceleration due to gravity on Mars. The acceleration due to gravity on Mars is approximately 3.71 m/s². Using the weight formula, we have P = m * g = 900 kg * 3.71 m/s² = 3339 N. Therefore, the weight of Curiosity on Mars is approximately 3339 Newtons.
c) The weight of Curiosity on Earth is significantly greater compared to its weight on Mars. On Earth, the acceleration due to gravity is approximately 9.8 m/s². Using the weight formula, we have P = m * g = 900 kg * 9.8 m/s² = 8820 N. Therefore, the weight of Curiosity on Earth is approximately 8820 Newtons.
The difference in weight between Earth and Mars is important because weight is directly related to the force of gravity. The greater weight on Earth indicates a stronger gravitational force, which affects the overall dynamics and requirements for missions like Curiosity.
It affects the launch and landing processes, the structural integrity of the spacecraft, the fuel and energy requirements, and the ability to conduct experiments and operate the robotic systems effectively. Understanding these differences is crucial for mission planning, spacecraft design, and mission success.
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A periodic wave travels from one medium to another. Which pair of variables are likely to change in the process?
A.
velocity and wavelength
OB.
velocity and frequency
Ο Ο Ο Ο
OC.
frequency and wavelength
OD.
frequency and phase
E.
wavelength and phase
Answers
Answer:
Velocity and frequency
Explanation:
At what temperature the velocity of sound is 2/3 of the velocity of sound at127’C?
Answers
Answer: 56.4
Explanation:
v=√γRTM
v=√xT T=127
2/3v = 2/3 √xT √127 = 11.
7.51 x 7.51 = 56.4
hope this helps!
Hanif is the tallest player in a volleyball team. He is in spiking position when Johan delivers him the ball. The 0.226-kg volleyball is 2.29 m above the ground and has a speed of 1.06 m/s. Hanif spikes the ball, doing 9.89 J of work on it. (a) Determine the potential energy and the kinetic energy of the ball before Hanif spikes it. (b) The total mechanical energy of the ball before Hanif spikes it.
Answers
(a)
Potential Energy = 4.95 J
Kinetic Energy =0.132 J
b.) the total mechanical energy of the ball before Hanif spikes it is 5.08 J.
How to calculate?Potential energy (PE) = mgh
Kinetic energy (KE) = (1/2)mv^2
m = 0.226 kg
h = 2.29 m
v = 1.06 m/s
g = 9.81 m/s^2 (acceleration due to gravity)
PE = mgh = (0.226 kg)(9.81 m/s^2)(2.29 m) = 4.95 J
KE = (1/2)mv^2 = (1/2)(0.226 kg)(1.06 m/s)^2 = 0.132 J
(b) The total mechanical energy of the ball before Hanif spikes it is the sum of its potential and kinetic energy:
Total mechanical energy = PE + KE = 4.95 J + 0.132 J = 5.08 J
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The average wavelength in a series of ocean waves is 15.0 m. A wave arrives on average every
10 s, so the frequency is 0.1 Hz. What is the average speed of the waves?
Answers
The average speed of the waves is 1.5 m/s
From the question,
We are to determine the average speed of the waves.
Using the formula
v = fλ
Where
v is the speed
f is the frequency
and λ is the wavelength
From the given information
f = 0.1 Hz
λ = 15.0 m
∴ Speed of the wave = 0.1 × 15.0
Speed of the wave = 1.5 m/s
Hence, the average speed of the waves is 1.5 m/s
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The current in a small torch bulb is 0.2A. What is the total electric charge which passes a point in the circuit in 12 minutes?
Answers
Answer:
Total charge= 0.2 x 7200 =1440 C
A(n) 1252 kg car is coasting along a level
road at 29.7 m/s. A constant braking force
is applied, such that the car is stopped in a
distance of 69.9 m.
What is the magnitude of the braking force?
Answer in units of N
Answers
The magnitude of the braking force of the car of mass 1252 kg is 265.98 N.
What is force?Force can be defined as the product of mass and acceleration.
To calculate the magnitude of the braking force, we use the formula below.
Formula:
F = m(v²-u²)/2s............. Equation 1Where:
F = Force from the brakem = Mass of carv = Final velocityu = Initial velocitys = DistanceFrom the question,
Given:
m = 1252 kgv = 0 m/su = 29.7 m/ss = 69.9 mSubstitute these values into equation 1
F = 1252(0-29.7)/(69.9×2)F = 37184.4/139.8F = 265.98 NHence, the magnitude of the braking force is 265.98 N.
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Write the differences between rest and motion
Answers
Answer:
Depends on position
Explanation:
Rest:
A body is said to be at rest, if it does not change its position with respect to its surroundings.
Motion:
A body is said to be in motion, if it changes its position with respect to its surroundings.
The state of rest and motion is relative
A physics professor leaves her house and walk along the sidewalk toward campus. After 5 min it starts to rain and she returns home. Her distance from her house as a function of time shown in figure: 1. At which of the labelled point is her velocity (a) zero? (b) Constant and positive? (c) constant and negative ? (d) Increasing in magnitude? (e) Decreasing in magnitude?
Answers
Answer: I think its zero-
I dont really know about this...
The age and crisis of the stage trust vs. mistrust
Answers
Hope it is helpful
PLEASE ANYBODY HELP <3
Answers
ANSWER IS = B. 60 KG
HOPE THIS ANSWER HELP YOU PLEASE FOLLOW ME AND LIKE IT AND VOTE IT
Light of wavelength 575 nm falls on two double slits spaced 0.30 mm apart. What is the required distance from the slits to a screen if the spacing between the first and second dark fringe is to be 4.00 mm
Answers
Answer:
L = 2.1 m
Explanation:
From Young's Double Slit Experiment, the formula for the distance between two consecutive dark or bright fringes, called fringe spacing, is derived as:
Δx = λL/d
where,
Δx = distance between first and second dark fringe = 4 mm = 4 x 10⁻³ m
λ = wavelength of light = 575 nm = 5.75 x 10⁻⁷ m
d = distance between the slits = 0.3 mm = 3 x 10⁻⁴ m
L = Distance from slits to screen = ?
Therefore,
4 x 10⁻³ m = (5.75 x 10⁻⁷ m)(L)/(3 x 10⁻⁴ m)
L = (4 x 10⁻³ m)/(1.92 x 10⁻³)
L = 2.1 m
3, A 4kg block is pushed 2m at an acceleration of 0.2m/s square up a vertical wall by a constant force F applied at an angle of 37° with the horizontal, as shown. If the cofficient of kinetic friction between the block and the wall is 0.30. Find the work done by the applied force the frictional force.
Answers
The work done by the applied force on the block against the frictional force is 15.75 J.
Work done by the applied force
The work done by the applied force is calculated as follows;
W = Fd
F - Ff = ma
where;
F is applied forceFf is frictional forceFcos(37) - μmgsin(37) = ma
Fcos(37) - (0.3)(4)(9.8)sin(37) = 4(0.2)
0.799F - 7.077 = 0.8
F = 9.86 N
W = Fdcosθ
W = 9.86 x 2 x cos(37)
W = 15.75 J
Thus, the work done by the applied force on the block against the frictional force is 15.75 J.
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what are crystalline substances in physics
Answers
In physics, crystalline substances refer to materials that possess a well-defined, ordered atomic or molecular structure.
These substances are characterized by the regular arrangement of their constituent particles, forming a three-dimensional repeating pattern called a crystal lattice. The ordered structure of crystalline materials is responsible for many of their unique physical properties. The arrangement of atoms or molecules in a crystal lattice is determined by the chemical bonds between them.
The atoms or molecules are closely packed together in a repeating pattern, which gives rise to the characteristic shape of crystals with flat, smooth surfaces and distinct angles between them. Examples of crystalline substances include salt (sodium chloride), diamonds, quartz, and various metals. Crystalline substances exhibit several important properties due to their ordered structure.
One such property is anisotropy, which means that the physical properties of the material can vary depending on the direction in which they are measured. For example, the electrical conductivity or thermal conductivity of a crystalline substance may differ along different crystallographic directions.
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WILL GIVE BRAINIEST PLZ HEP!!!!!!
Which is a component of skill-related fitness?
Flexibility
Reaction time
Muscular strength
Body Composition
Answers
Answer:
B. Reaction Time
Explanation:
Reaction Time is the amount of time it takes to respond to anything.
Select the correct answer.
A boat moves 60 kilometers east from point A to point B. There, it reverses direction and travels another 45 kilometers toward point A. What are the total
distance and total displacement of the boat?
O A.
OB.
O C.
O D.
The total distance is 105 kilometers and the total displacement is 45 kilometers east.
The total distance is 60 kilometers and the total displacement is 60 kilometers east.
The total distance is 105 kilometers and the total displacement is 15 kilometers east.
The total distance is 60 kilometers and the total displacement is 45 kilometers east.
Answers
The total distance is 105 kilometers and the total displacement is 15 kilometers east. Option C
How to solve for the total distanceTo calculate the total distance, we add the distances traveled in each leg of the journey: 60 kilometers (from A to B) + 45 kilometers (from B back to A) = 105 kilometers.
However, displacement refers to the change in position of an object in a straight line from its starting point to its ending point. In this case, since the boat starts and ends at the same point (A), the total displacement is zero.
Hence The total distance is 105 kilometers and the total displacement is 15 kilometers east.
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If the air inside a balloon exerts a force of 1 N on an area of 0.5 m^2 what is the pressure inside the balloon
Answers
Answer:
2 Pascal (Pa)
Explanation:
Pressure is defined as the force acting per unit area. Mathematically, it is expressed as:
Pressure (P) = Force (F) / Area (A)
Given:
Force exerted by the air inside the balloon (F) = 1 N
Area of the balloon (A) = 0.5 m^2
Plugging in the given values into the formula for pressure, we get:
P = F / A
P = 1 N / 0.5 m^2
Using basic arithmetic, we can calculate the pressure inside the balloon:
P = 2 N/m^2
So, the pressure inside the balloon is 2 N/m^2, which is also commonly referred to as 2 Pascal (Pa) since 1 Pascal is equal to 1 N/m^2.
A 0.1 kg toy train car moving at 1.0 m/s runs into a stationary car with a mass of 0.15 kg. At what speed do they move off together?
Answers
We can use the conservation of momentum principle to solve this problem. According to this principle, the total momentum of a system of objects remains constant if there are no external forces acting on the system. In this case, we can assume that there are no external forces acting on the two cars after they collide, so the total momentum of the system before the collision must be equal to the total momentum of the system after the collision.
The momentum of an object is defined as its mass multiplied by its velocity:
momentum = mass * velocity
Before the collision, the momentum of the first car (m1) is:
p1 = m1 * v1 = (0.1 kg) * (1.0 m/s) = 0.1 kg⋅m/s
Since the second car is stationary, its momentum before the collision is zero:
p2 = m2 * v2 = (0.15 kg) * (0 m/s) = 0 kg⋅m/s
The total momentum of the system before the collision is:
p1 + p2 = 0.1 kg⋅m/s + 0 kg⋅m/s = 0.1 kg⋅m/s
After the collision, the two cars move together with a common velocity (v), so the momentum of the system is:
p = (m1 + m2) * v
We can set the total momentum before the collision equal to the total momentum after the collision:
p1 + p2 = p
0.1 kg⋅m/s + 0 kg⋅m/s = (0.1 kg + 0.15 kg) * v
0.1 kg⋅m/s = 0.25 kg * v
v = 0.1 kg⋅m/s ÷ 0.25 kg
v = 0.4 m/s
Therefore, the two cars move off together at a speed of 0.4 m/s after the collision.
An investigation of an automobile crash suggests that vehicle A was moving at 52
mph toward the south and vehicle B was moving at an unknown speed toward the
north, when the two cars collided, sticking together after the collision.
Vehicle A weighs 1350 lbs., and vehicle B weighs 1893 lbs. If the cars did not move
significantly after their collision, find the initial speed of vehicle B in mph.
mph (miles per hour)
Answer:
Answers
Here the total momentum of the vehicles is conserved during even after the collision. The two cars are not moving after, hence their final momentum is zero which means, the have equal and opposite momentum. Hence, the initial speed of B were, 37 mph.
What is momentum ?Momentum of an object is the product of the mass and velocity of the object. It is a vector quantity and having both direction and magnitude.
Given mass of A = 1350 lbs
v = 52 mph
then momentum = 1350 lbs × 52 mph = 70200 lbs mph
Mass of B = 1893 lbs
let its velocity be v .
then momentum = 1893 v.
According to conservation of momentum:
m1u1 + m1 u2 = (m1+ m2) v
The cars are not moving after the collision. Hence, the final speed is zero.
then, 70200 lbs mph + 1893 v = 0
70200 lbs mph = - 1893 v
v = 70200 lbs mph /1893 lbs
= 37 mph.
Therefore, the velocity of the car B is 37 miles per hour.
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A patient comes to an outpatient laboratory for a physician-ordered fasting test. The patient indicates that he forgot that the test was to be fasting and ate a candy bar 2 hours ago. The patient insists that you should draw the test because he cannot come back at another time. What should you do?
Answers
The patient eating a candy bar instead of fasting for the test should be told
that the test results will be wrong and he may receive a wrong diagnosis.
The medical practitioners told him to fast when coming for a reason and he
forgetting and eating something means the objective for the test may have
been defeated.
This is why it's best to explain to him about the consequences of his actions
which is likely getting a wrong result and diagnosis.
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The picture shows two solutions of salt water. Which solution is more concentrated (has a higher concentration)?
Question 15 options:
The first solution is more concentrated
The second solution is more concentrated
The solutions have the same concentration.
Answers
In order to determine which of the two solutions of salt water is more concentrated, we need to first understand what concentration means and how it is measured. Concentration refers to the amount of solute dissolved in a given amount of solvent. It is typically measured in units of mass per volume, such as grams per liter (g/L) or milligrams per milliliter (mg/mL). so The second solution is more concentrated
When comparing the concentration of two solutions, the one with a higher concentration has more solute dissolved in the same amount of solvent. Therefore, in the picture provided, we can determine which solution is more concentrated by looking at the relative amounts of solute in each solution.If the solutions have the same concentration, then they must have the same amount of solute dissolved in the same amount of solvent. From the picture, we can see that both solutions are in the same size container and have the same amount of solvent (water) in them. Therefore, we can conclude that they have the same concentration of salt.The amount of solute dissolved in a solution can be increased by either adding more solute or by reducing the amount of solvent. If we were to add more salt to one of the solutions, we would increase the concentration of that solution. Alternatively, if we were to evaporate some of the water from one of the solutions, we would reduce the amount of solvent and increase the concentration of that solution.
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The process of making alloys involves pure metals to remove impurities. Then the pure metals are with other components.
Answers
The process of making alloys involves the use of pure metals to remove impurities and then combining the purified metals with other components to create a desired alloy with specific properties.
Alloys are metallic substances that are composed of two or more elements, with at least one of them being a metal. The process of making alloys typically involves several steps to ensure the desired composition and properties are achieved.Removing impurities: The first step in making alloys is to obtain pure metals. Pure metals are often extracted from ores and undergo processes such as smelting or refining to remove impurities. This purification step is important to ensure the resulting alloy has consistent properties.Composition determination: Once the pure metals are obtained, their composition is determined based on the desired alloy's characteristics. This involves considering factors such as strength, hardness, corrosion resistance, electrical conductivity, and other specific properties required for the intended application.Mixing and melting: The pure metals, along with other components or alloying elements, are mixed together in precise proportions. Alloying elements can be other metals or non-metals, such as carbon. The mixture is then heated to a high temperature to melt the metals and ensure uniform mixing.Homogenization: After melting, the alloy is typically subjected to a process called homogenization. This involves holding the molten alloy at a specific temperature for a period of time to allow for diffusion and ensure a consistent distribution of the alloying elements throughout the mixture.Cooling and solidification: Once the homogenization is complete, the molten alloy is cooled down. The cooling rate can influence the microstructure and properties of the alloy. Controlled cooling techniques may be employed to achieve specific characteristics, such as fine-grained structures or desired phase transformations.Further processing: The solidified alloy can undergo additional processes such as forging, rolling, extrusion, or heat treatment to further refine its properties and shape it into the desired final product.By following these steps, the process of making alloys ensures the removal of impurities from pure metals and the combination of those metals with other components to create alloys with specific properties suitable for various applications.For more such questions on Alloys, click on:
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A thin half ring with a radius of R = 10 cm is uniformly charged with a linear density of = 1 Mikrokulon/m and located in a vacuum. Determine the force F of interaction between the half ring and a point charge q = 20 nC located at the center of curvature. (don't use chatgpt please)
Answers
Answer:
Explanation:
F = k * q * lambda * R * π * (1 - √2/2)
Substituting the given values of q, lambda, R, and k, we get:
F = (9 x 10^9 N*m^2/C^2) * (20 x 10^-9 C) * (1 x 10^-6 C/m) * (0.1 m) * π * (1 - √2/2)
F ≈ 8.58 x 10^-4 N
Therefore, the force of interaction between the half ring and the point charge is approximately 8.58 x 10^-4 N.
a 12v battery delivers 3.5A at 10.95. Determine the internal Resistence of cell.
Answers
According to Ohms law, the resistance in a circuit is the ratio of its voltage to the current across the circuit. The resistance of the circuit with 12 v and 3.5 A current is 3.4 ohms.
What is Ohm's law?Ohm's law is one of the fundamental law in physics. It states that, the voltage over a circuit is the product of the resistance and current through the circuit.
hence, V = IR
Therefore, the voltage through a circuit is directly proportional to the current and resistance through the circuit. As the resistance increases, current through the circuit decreases.
The voltage in the cell = 12 V
current I = 3.5 A.
then internal resistance R = V/I
R = 12/3.5 = 3.4 Ω
Therefore, the resistance in the cell is 3.4 ohms.
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Why is it important for scientist to be skeptical
Answers
Answer:
I don't actually know, but it has to do with the research they id
Explanation:
to seem precise
Difference between calorimeter and thermometer ?
Answers
Answer:
A calorimeter is can be used to measure the amount of heat released or involved in a chemical reaction. Whereas thermometer can only measures temperature or hotness of a substance. It cannot be used to measure the thermal rate or amount of heat energy of a reaction.
Explanation:
A velocity time graph shows how____ changes over time
Answers
Answer: A velocity-time graph shows how velocity changes over time
Explanation:
Answer:velocity
Explanation: