true or false: we can determine if a star is moving toward or away from earth by measuring its brightness.
Answers
We can determine if a star is moving toward or away from earth by measuring its brightness.
The correct answer would be:
\(\fbox{False}\)
Related Questions
A wooden ball with a mass of 0. 45 kg is at rest when it is tapped by a wooden mallet that applies an average force of 83 n to the ball. After contact with the mallet, the ball moves forward at 1. 3 m/s. How long was the mallet in contact with the ball?.
Answers
The mallet was in contact with the ball for 0.0455 s.
Mass of the wooden ball, m = 0.45 kg, Average force applied by the wooden mallet, F = 83 N Initial velocity of the ball, u = 0 Final velocity of the ball, v = 1.3 m/s, Time taken by the mallet in contact with the ball, t = ?
We know that the force acting on an object is given by:F = (m * (v-u))/t, where, m = mass of the object, v = final velocity of the object, u = initial velocity of the object, and t = time taken by the force to act, On substituting the given values in the above formula, we get:83 = (0.45 * (1.3 - 0))/tt = (0.45 * 1.3)/83t = 0.0455 s. Therefore, the mallet was in contact with the ball for 0.0455 s.
The time taken by the mallet to be in contact with the ball is 0.0455s.
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Dr. Kirwan is preparing a slide show that he will present to the executive board at tonight's committee meeting. He places a 3.50-cm slide behind a lens of 20.0 cm focal length in the slide projector. A) How far from the lens should the slide be placed in order to shine on a screen 6.00 m away? B) How wide must the screen be to accommodate the projected image?
Answers
Answer:
A) d_o = 20.7 cm
B) h_i = 1.014 m
Explanation:
A) To solve this, we will use the lens equation formula;
1/f = 1/d_o + 1/d_i
Where;
f is focal Length = 20 cm = 0.2
d_o is object distance
d_i is image distance = 6m
1/0.2 = 1/d_o + 1/6
1/d_o = 1/0.2 - 1/6
1/d_o = 4.8333
d_o = 1/4.8333
d_o = 0.207 m
d_o = 20.7 cm
B) to solve this, we will use the magnification equation;
M = h_i/h_o = d_i/d_o
Where;
h_o = 3.5 cm = 0.035 m
d_i = 6 m
d_o = 20.7 cm = 0.207 m
Thus;
h_i = (6/0.207) × 0.035
h_i = 1.014 m
help asap please!
calculate the answer to the correct number of significant digits.
-3.22 x 5.1
Answers
A thin 2.00 kg box rests on a 7.00 kg board that hangs over the end of a table, as shown in (Figure 1). a) How far can the center of the box be from the end of the table before the board begins to tilt?
Answers
Based on the principle of moments, the distance from the end of the table should the box be placed before the board begins to tilt is 17.5 cm.
The distance from the end of the table should the box be placed before the board begins to tilt is determined from the principle of moments as follows:
sum of clockwise moments = sum of anticlockwise moments
The block is 30 cm on the table and 20 cm outside it.
The downward force acting on the left-hand side of the box
= 3/5 x 7 = 4.2
This force acts at the center of gravity, 15 cm or 0.15 m away.
Therefore, anticlockwise moments o the left side =4.2 x 0.15 = 0.63 J
Also, the clockwise moment on the right side = Force × distance
Force = 2/5 x 7 = 2.8 N
Distance from the center of gravity = 10 cm or 0.10 m away.
the clockwise moment on the right side due to the board = 2.8 x 0.1 = 0.28.
The moment due to the box with a weight of 2kg at a distance of x meters will be:
the total clockwise moment on the right side = 0.28 + 2x.
When the board is just about to tilt:
0.63 = 0.28 + 2x
2x = 0.63 - 0.28
x = 0.175m or 17.5cm
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If the temperature in the past was 2.9 C higher than today what would the corresponding change in the Fahrenheit temperature have been?
Answers
Answer:
1 deg C = 5/9 deg F (Ex. 212 F - 32) * 5/9 = 100
So deg F = 9/5 deg C = 9/5 * 2.9 = 5.2 deg F
A stationary 3-kg hard steel ball is hit head-on by a 1-kg hard steel ball moving to the right at 4 m/s. After the collision, the 3-kg ball moves to the right at 2 m/s. What is the velocity (speed and direction) of the 1-kg ball after the collision?
Answers
From conservation of momentum we have that:
\(\begin{gathered} 1(4)+3(0)=1v+3(2) \\ 4=v+6 \\ v=4-6 \\ v=-2 \end{gathered}\)Therefore the velocity of the 1 kg ball after the collision is 2 m/s to the left.
In the decimal number 40.04672, what number is in the 100th's (hundredths, 1/100s)place?
Answers
Answer:
6
Explanation:
because the numbers before the decimal point are whole numbers so that would mean the 4 & 0 before the points the ones and tens place. and anything behind a decimal goes in order as usual ones,tens,hundredths, thousandths, ten thousandths, and so on. so that what makes the 6 be in the hundredths place.
yes this nees helppppppppppppppp
Answers
Answer:
lol
Explanation:
it was funny
A bird flies due north with a speed of 15 m/s relative to the air. The air moves due west with a speed of 11 m/s relative to the ground. What is the robin's speed relative to the ground?
Answers
Answer:
I'm not sure if the directions affect the speed tho
but I think it's 4? cause it's the speed relative to the ground
hope this helps:))
Which of these will cause the highest tides? A. when the Sun, Moon and Earth are in a straight line B. when all of the planets are on the same side of the Sun C. when the Sun, Earth, and Moon form a right angle D. when there are high speed winds caused by seasonal changes
Answers
Answer:
A. when the Sun, Moon and Earth are in a straight line
Explanation:
The highest tide is formed when the sun, moon, and also the earth are in alignment. This high tide is known as spring tides.
Spring tides happen when we have a new moon or a full moon. With the earth, sun and moon aligning. We have lunar and solar tide forming a reinforcement with each other causing high tides or extreme tides. we have collectively, their gravitational pull on water of the earth to become stronger
A block with the mass of 14.26kg is on a ramp with an incline of 41 degrees. If the block is stationary, what is the minimum value of the coefficient of static friction? [Please explain to me how you did it, I'm giving you 30 points lol the last two times I've asked ive gotten either no explanation or a link to a calculator...]
Answers
The minimum value of the coefficient of static friction between the surface and the stationary block is 0.87.
What is the coefficient of static friction?The coefficient of static friction is equal to the tangent of the angle at which the objects slide.
Mathematically,
μs = tan(θ)where;
μs is the coefficient of static frictionθ is the angle of inclination just before the object begins to slide.Since the block is stationary, the minimum value of the coefficient of static friction will be:
μs = tan(41°)
μs = 0.87
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If the density is constant, the microscopic mass balance reduce to laplace transform x v = 0
T/F
Answers
The given statement "If the density is constant, the microscopic mass balance reduce to laplace transform x v = 0" is TRUE because when the density is constant, it means that the mass per unit volume of the substance is the same throughout the system.
Understanding Laplace transformIn this case, the microscopic mass balance equation reduces to the Laplace transform of the velocity (v) multiplied by the position (x) equals zero.
This is because there is no net accumulation or depletion of mass in any part of the system since the density remains constant.
The Laplace transform is a mathematical tool used to simplify and solve differential equations, and in this case, it helps to derive the relationship between mass and velocity in a system with a constant density.
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While on a vacation in Kenya, you visit the port city of Mombassa on the Indian Ocean. On the coast is an old Portuguese fort with large stone walls rising vertically from the shore. An inscription on a plaque states that the walls are an impressive 44 m high. You find the fort's cannons mounted so that they fire horizontally out of openings near the top of the walls facing the ocean. Calculate the muzzle velocity necessary to hit a ship 300.0 meters from the base of the fort.
Answers
The muzzle velocity necessary to hit a ship is 100 m/s
The motion of a cannonball that is fired from the gun is a typical projectile motion. The motion occurs in a vertical plane. The cannonball traces out a parabolic path during the motion. Projectile motion is governed by gravity. The cannonball has a constant downward acceleration, the acceleration due to gravity g
This vertical acceleration is responsible for the parabolic path which would otherwise have been a straight-line path.
By equation of motion from A to B in horizontal direction
S = ut + 1/2 at^2
Where, acceleration in horizontal direction a = 0
Therefore,
S = ut + 0
300 = u(3)
u = 100 m/s
Hence, the muzzle velocity necessary to hit a ship is 100 m/s
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The diagram represents a closed energy system consisting of air and equal masses of copper, granite, and water in a perfectly insulated container. The temperatures were taken at the time the materials were placed inside the closed system.
Q1. In the first day after the materials were placed in the system, the temperature of the water would probably ___.
Q2. As time passes, the total energy in the system will _________.
Answers
(1) In the first day after the materials were placed in the system, the temperature of the water would probably increase.
(2) As time passes, the total energy in the system will be conserved.
What is law of conservation of energy?
The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.
Based on the law of conservation of energy, when equal masses of copper, granite, air and water are in a perfectly insulated container, there will be heat transfer from one object to another.
After several hours, all the objects in the perfectly insulated container, will attain equilibrium temperature.
The equilibrium temperature attained by the objects will be greater than the initial temperature of water, lower than the initial temperature of copper, granite, and air.
Conclusively, we would say that the temperature of water will increase in the first day after the materials were placed in the system.
As time passes, the total energy in the system will be conserved since it is a perfectly insulated container, and no heat energy will be lost.
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our best data about the surface topography of venus has come from:
Answers
The best data about the surface topography of Venus has come from various missions and instruments sent by different space agencies. The first spacecraft to provide information about Venus was NASA's Mariner 2, which made a flyby in 1962.
However, it was the Soviet Venera missions that provided the most detailed information about the planet's surface in the 1970s and 1980s. The Venera probes used radar to map the surface, revealing that Venus has vast volcanic plains, impact craters, and mountain ranges. Later missions, such as NASA's Magellan spacecraft in the 1990s, provided even more detailed maps of Venus' surface topography using advanced radar imaging techniques.
With these missions, scientists have been able to study the geology and morphology of Venus, including its thick atmosphere, which has made it difficult to observe the surface with visible light. Overall, the data collected from these missions has greatly improved our understanding of Venus and its unique topography.
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2. A roller coaster is at the top of a 72 m hill and weighs 150 kg. The coaster (at this moment) has
energy
anarov
Answers
Answer:
it is going down down down down the hill it goes so the roller coaster will then be down to a 0 m
Under favorable circumstances, including reaction time, a motor vehicle going 50 mph can be stopped within:A) about 550 feetB) about 229 feetC) about 143 feetD) about 78 feet
Answers
A car traveling at 50 mph can be stopped in roughly 229 feet under ideal conditions, including reaction time.
How do you define reaction?When several atoms or molecules with the proper orientation and the least amount of energy efficiently collide, a reaction happens. Rate of reaction are the molecules that commence a chemical change, whereas products are the molecules that are formed as a consequence of the reaction.
Why would reactions occur?Two features of nuclear reactions are the formation of new bonds between carbon molecules in resultant particles and the establishment of molecular links amongst individual atoms (particles) (molecules). The quantity of structures changes despite the fact the number of atoms is the same before and after the chemical transition.
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A playground merry-go-round spins about its axis with negligible friction. A child moves from the center of the merry-go-round to the rim. For this system, indicate which of the following quantities change.
A. Potential energy
B. Angular momentum
C. Mass
D. Moment of inertia
E. Angular speed
F. Rotational kinetic energy
Answers
Answer:
B
Explanation:
In this process on merry go round there is not any external torque so angular momentum will be conserve. Mass is always conserved.
The following steps lead to convection in the atmospheres of giant planets. Place the following in order, following (a).
a. Gravity pulls particles toward the center.
b. Warm material rises and expands.
c. Particles fall toward the center, converting gravitational energy to kinetic energy.
d. Expanding materials cools.
e. Thermal energy heats the material.
f. Friction converts kinetic energy to thermal energy.
Answers
Place the following in order, following (a) are:
a. Gravity pulls particles toward the center.
c. Particles fall toward the center, converting gravitational energy to kinetic energy.
f. Friction converts kinetic energy to thermal energy.
e. Thermal energy heats the material.
b. Warm material rises and expands.
d. Expanding materials cool.
In physics, gravity is an essential interplay that reasons mutual appeal between all things with mass or electricity. Gravity is, through a long way, the weakest of the 4 essential interactions, approximately 1038 instances weaker than the sturdy interaction, 1036 times weaker than the electromagnetic force, and 1029 instances weaker than the susceptible interplay. As an end result, it has no tremendous influence on the extent of subatomic debris. but, gravity is the biggest interaction between gadgets on the macroscopic scale, and it determines the movement of planets, stars, galaxies, or even light.
The gravitational enchantment between the authentic gaseous count within the Universe allowed it to coalesce and shape stars which in the end condensed into galaxies, so gravity is answerable for some of the huge-scale systems within the Universe. Gravity has a limitless range, despite the fact that its consequences emerge as weaker as objects get farther away.
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what Are the Advantages of SI unit
Answers
Answer:
1)SI is coherent system of units
2) SI is rational system of units
How do adaptations help an animal survive?
Answers
Answer: Depends on their adaptions such as they may be able to change their color of their skin to camouflage to hide from predators or they are able to survive in harsh weather where they live in.
Explanation:
Answer: An adaptation is a very particular skill which helps an animal do the things they do in every day life . Adaptation basically helps an animal survive in the environment they have decided to live in .
Hoped I helped -
Sleepy~
which statement describes the kind of work of nicolaus copernicus performed? responses inventing analytic geometry inventing analytic geometry developing a heliocentric theory developing a heliocentric theory experimenting on human bodies experimenting on human bodies studying prisms and the nature of light
Answers
The statement, developing a heliocentric theory, describes the kind of work of nicolaus copernicus performed. Option b is correct.
Nicolaus Copernicus was a Polish astronomer who is widely credited with developing the heliocentric theory, which proposes that the sun is at the center of the universe, with the planets orbiting around it. This theory was a major shift from the previously accepted geocentric theory, which placed the Earth at the center of the universe. Copernicus' work was instrumental in the scientific revolution and laid the groundwork for future astronomical research. Hence option b is the correct choice.
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--The complete answer is, Which statement describes the kind of work of nicolaus copernicus performed?
a. inventing analytic geometry
b. developing a heliocentric theory
c. experimenting on human bodies
d. studying prisms and the nature of light--
What are organs made of?
O Organs are made of colections of tissues,
O Organs are made of cells, but not tissues.
O Organs are made of collections of other
O Organs are made of muscle and bone.
DONE
Answers
Tissues are made of cells though so it’s kinda a weird question lol
Answer:
Organs are made of collections of tissues, which are groups of cells.
Explanation:
what we have to do ? please someone help
Answers
6. Which statement best describe the relationship between temperature and thermal energy?
(1 Point)
Temperature is inversely related to thermal energy
Temperature is directly proportional to thermal energy
As temperature foes up, thermal energy goes down
Thermal energy is not related to energy
Answers
Answer:
Temperature is directly proportional to thermal energy.
PLEASE HELP ME!!! IREALLY NEED IT AND I WILL MARK BRAINLIST IF YOU ANSWER CORRECTLEY!!! mass of 0.22kg is oscillating on the planet Tatooine at a small angle from a light string of length 0.30m, with a period of 0.90s. What is the acceleration of gravity on Tatooine?
Answers
Answer:
The correct answer is 1.3Hz
Answer:
15 m/s
Explanation:
0.3 + 0.2 = 0.5
0.5 * 10 = 5
5 + 10 = 15
a baseball bat strikes a ball head-on with an average force of 2.0 × 104 newtons. if the bat stays in contact with the ball for a distance of 5.0 × 10-3 meter, what kinetic energy will the ball acquire from the bat?
Answers
A baseball bat strikes a ball with an average force of 2.0 x 104 Newtons. if the bat stays in contact with the ball for a distance of 5.0 x 10-3 meter , the kinetic energy is 2× 10² J
In classical mechanics, the kinetic energy of a non-rotating body of mass m moving with velocity v is 1/2 mv².
Favg= -1/2 MV²
Favg = -1 2 ( 5.0 x 10⁻³)²
Favg = - 1/2 ×25 × 10⁻⁶
Favg = 2× 10² J
Kinetic energy is the energy that an object has when it moves. It is defined as the work required to accelerate an object of specified mass from rest to a specified velocity. After the body acquires this energy during acceleration, it retains this kinetic energy as long as the velocity does not change.
The kinetic energy of an object is the energy it has due to its motion. It is defined as the work required to accelerate an object of specified mass from rest to a specified velocity.
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Si la fuerza de fricción cinetica es 250N ¿Qué fuerza se necesita para mantener a la caja deslizándose a una velocidad constante ¿
Answers
Answer:
250N
Explanation:
According to newton second law,
\sumF = ma
Fm - Ff = ma
Since the velocity is constant, a = 0m/s
Frictional force Ff = 250N
Substitute
Fm - 250 = m(0)
Fm - 250 = 0
Fm = 250N
Hence the force to keep the box sliding at constant speed is 250N
11. What kind of force did the levitating rings display? What does this say
about the magnetic domains of these objects? Record your evidence.
Answers
answer :
force is called the magnetic force of repulsion, and it happens when two magnets have the same poles (either both north or both south) and they push away from each other.
When all the domains in a material are aligned in the same direction, the material becomes strongly magnetized.
explanation :
magnetic domains in the rings were stable and strong enough to resist the force of gravity.
In the case of the levitating rings, the magnetic domains were aligned in such a way that they created a strong magnetic field, which allowed the rings to levitate in mid-air.
tiny regions within ferro magnetic material that have their own magnetic fields are called magnetic domains.
Magnetic domains in the rings refer to the tiny regions within the ring's ferro magnetic material that have their own magnetic fields.
A ship is travelling due east at
30 km/hr and boy runs across
the deck in a south east west
direction at 10 km/hr. Find the
veloocity of the boy relative to sea.
Answers
Answer:
The relative velocity of the boy with respect to the sea is 37.7 km/hr
Explanation:
Answer:
37.7 km/hr I'd the velocity