if an astronaut can throw a certain wrench 14.0 m vertically upward on earth, how high could he throw it on our moon if he gives it the same starting speed in both places?

Answer:

it would be c

Explanation:

its the only one that makes sence

The theory that dark matter is not real and is just a problem with our theory of gravity has been falsified by an observation of what happens when clusters of galaxies collide. The term dark matter was coined in 1933 by Fritz Zwicky.

The observed evidence for dark matter is quite strong, and we know it's unlikely to be a mathematical artifact because different galaxies appear to have different amounts of dark matter, with some not having any at all. If our model of gravity were in error, we would expect to see the same error in all galaxies we observe. This is not the case.

Instead, we observe that some galaxies behave exactly as the model says they should, and some behave as if they're heavier than they ought to be.

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Answer:

1040

Explanation:

The rules for significant digits is that non-zero digits are significant figures. The  zero in between 1 and 4 is significant because any zeroes between two significant digits are significant. Trailing zeroes if there is no decimal point are insignificant.

The number 1045.2 rounded to three significant digits would be 1040 because the rightmost zero is not a significant digit.

In positional notation, significant figures refer to the digits in a number that is trustworthy and required to denote the amount of something, also known as the significant digits, precision, or resolution.

The definition of a significant digit according to the criteria is a non-zero digit. Any zeroes between two significant digits, such as the one between 1 and 4, are noteworthy. In the absence of a decimal point, trailing zeroes are not relevant.

According to the criteria for significant digits, non-zero digits are important numbers. The zero between 1 and 4 is crucial, as is any zero between two significant digits. The trailing zeroes are irrelevant if there is no decimal point.

Thus, the number 1045.2 rounded to three significant digits would be 1040.

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Energy conserved during this reaction in this way; The reaction system absorbs 27 kJ of energy from the surroundings. Option C

In the situation that has been described, it showss that the reaction is endothermic, which means it requires energy to proceed.

The bonds in the products store more energy than those in the reactants, and that extra energy has to come from somewhere, and the only explanation is that it came from the surroundings.

The energy is conserved because it is not lost or created; it is simply transferred from the surroundings to the system.

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Light source will pass through and form a shadow, when I hold the largest cardboard between the light source and the wall. Since, the cardboard is not so thick it will allow rays to pass through it.

Light rays always travel in a straight line. A shadow is formed when the light rays hit an opaque object. Sun is a natural source of light. The rays from the sun fall on objects on earth and forms shadows. Light rays do not interfere with each other if they come cross each other. Light rays travel from the direction of source to the direction of eye. They show property of reflection wherein after colliding a surface they trace their path back.

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Answer:

First one: False. Second one: decrease. Third one: decreased

Explanation:

For the first one, potato chips will make the floor more slippery than just regular tile. Second one, if the force holding the 2 things together decreases, the friction will decrease as well. For the third one, if water is over the floor, it makes it even more slippery.

Hope this helps!

Answer:

1:False 2:Decrease 3:Decrease

The waves created by the generator are traveling at a speed of 60 m/second.

The speed of a wave can be calculated by multiplying its frequency by its wavelength. In this case, the frequency of the wave is given by the number of vibrations per unit time, and the wavelength is given as 0.5 m.

The frequency of the wave generator can be calculated as 600 vibrations per 5 seconds, or 120 vibrations per second.

Therefore, the speed of the waves created by the generator can be calculated as:

Speed = Frequency x Wavelength

Speed = 120 vibrations/second x 0.5 m/vibration

Speed = 60 m/second

Therefore, the waves created by the generator are traveling at a speed of 60 m/second.

It is worth noting that the speed of a wave is determined by the properties of the medium through which it is traveling.

In this case, the speed of the wave is determined by the tension and density of the rope. If these properties were to change, the speed of the wave would also change.

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The speed of a satellite moving in a stable circular orbit around the earth at a height of 3600 km is 6310 m/s

The satellite will experienced a centripetal force which is equivalent to the gravitational force between the satellite and the earth.

centripetal force =  m . v²/R

gravitational force = GMm/R²

Hence,

m . v²/R =  GMm/R²

v² = GM/R

v = sqrt (GM/R)

Where:

G = gravitational constant = 6.67 x 10⁻¹¹ Nm²/kg²

R = distance from the center of the earth

M = earth's mass = 5.97 x 10²⁴ kg

The earth radius = 6400 km and the satellite's orbital height is 3600 km.

Hence,

R = 6400 + 3600 = 10,000 km = 10⁷ m

Plug these parameters into the equation:

v = sqrt (6.67 x 10⁻¹¹ x  5.97 x 10²⁴ /  10⁷)

v = 6310 m/s

Hence, the speed of the satellite is 6310 m/s

Your question is incomplete, but most probably your question was:
Calculate the speed of a satellite moving in a stable circular orbit around the earth at a height of 3600 km.

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Answer:

Venus has phases similar to the moon’s phases.

Explanation:

i hope this helped you :)

The statement is false. The expansion of the universe has not been constant since its formation.

The cosmos has been expanding faster over time, according to the prevalent scientific theory. Observations of far-off supernovae and measurements of cosmic microwave background radiation were used to make this finding.

It sparked the development of the cosmic inflation theory and the idea of dark energy, which is believed to be the cause of the rapid expansion. Throughout the universe's history, the pace of expansion has changed, with periods of slower growth and periods of quicker expansion.

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The spectrum observed from the Sun (or any star) would exhibit an absorption spectrum. This is because the outer gaseous atmosphere of the star absorbs specific wavelengths of light, resulting in dark absorption lines in the spectrum.

In the cooler, lower-density outer atmosphere, where white light from the star travels, some atoms or molecules in the atmosphere absorb photons with particular energy. In the spectrum, these absorptions show up as black lines at specific wavelengths. The specific set of absorption lines that each element or molecule generates results in a distinctive pattern that can be used to identify the elements that are present in the star's atmosphere.

The absorption spectrum offers insightful data on the chemical make-up and physical characteristics of the star. Astronomers can ascertain the elements present, their abundances, and other characteristics like the temperature, pressure, and velocity of the star's atmosphere by examining the absorption lines.

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Answer:

x = 4.32 [m]

Explanation:

We must divide this problem into three parts, in the first part we must use Newton's second law which tells us that the force is equal to the product of mass by acceleration.

∑F = m*a

where:

F = force = 700 [N]

m = mass = 2030 [kg]

a = acceleration [m/s²]

Now replacing:

\(F=m*a\\700=2030*a\\a = 0.344[m/s^{2}]\)

Then we can determine the final speed using the principle of conservation of momentum and amount of movement.

\((m_{1}*v_{1})+Imp_{1-2}=(m_{1}*v_{2})\)

where:

m₁ = mass of the car = 2030 [kg]

v₁ = velocity at the initial moment = 0 (the car starts from rest)

Imp₁₋₂ = The impulse or momentum (force by the time)

v₂ = final velocity after the impulse [m/s]

\((2030*0) + (700*5)=(2030*v_{2})\\3500 = 2030*v_{2}\\v_{2}=1.72[m/s]\)

Now using the following equation of kinematics, we can determine the distance traveled.

\(v_{2}^{2} =v_{1}^{2}+2*a*x\)

where:

v₂ = final velocity = 1.72 [m/s]

v₁ = initial velocity = 0

a = acceleration = 0.344 [m/s²]

x = distance [m]

\(1.72^{2}=0^{2} +(2*0.344*x) \\2.97 = 0.688*x\\x = 4.32 [m]\)

The weight density of water is 62.4 pounds per cubic foot. This value is used to determine the weight of water based on its volume.

The weight density of a substance is a measure of how much weight it has per unit volume. In the case of water, its weight density is 62.4 pounds per cubic foot. This means that for every cubic foot of water, it will weigh 62.4 pounds.

Weight density is an important concept in various fields, such as engineering, construction, and fluid mechanics. It allows us to calculate the weight of water in different scenarios. For example, if we have a tank with a known volume of water, we can use the weight density to determine the total weight of the water in the tank. Similarly, if we know the weight of water in a container, we can calculate its volume by dividing the weight by the weight density.

Understanding the weight density of water is crucial for various practical applications. It helps in designing structures that involve water, such as dams, reservoirs, and pipes, as it provides insights into the forces exerted by the water. Additionally, it is also relevant in fields like hydrology and environmental science, where accurate measurements of water weight are necessary for calculations and analysis.

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(d) 50N/C

The magnitude of the electric field at point 'P' is 50N/C.

It is derived from the basic concepts of Electrostatics. Coulomb's Law is the basis of relations in Electrostatics. It resembles Newton's Law of Gravitation.

Using the relation between Electric force, charge, and Electric field:

                                          F = qE

                                     200 = (4)E

                                          E = 50N/C  

It is widely used in the calculation of Electric Force and Electric Field. The S.I. Unit of the Electric Force is Newton. The S.I. Unit of the Electric Field is N/C. The S.I. Unit of charge is Coulomb.

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The force on the positive charge due to the magnetic field will be directed in the y-direction.

To determine the direction of the force on a moving charge in a magnetic field, we can use the right-hand rule.

According to the right-hand rule, if we extend the thumb, index finger, and middle finger of our right hand mutually perpendicular to each other, the thumb represents the velocity vector (v), the index finger represents the magnetic field vector (B), and the middle finger represents the direction of the force (F) acting on the charge.

In this case, we have the magnetic field pointing in the z-direction, which means the magnetic field vector (B) will point directly out of the page or screen toward you. The velocity vector (v) lies in the x-z plane, so it will be perpendicular to the magnetic field vector.

Using the right-hand rule, we can place our right hand with the thumb pointing in the positive x-direction (toward the right), the index finger pointing in the positive z-direction (out of the page), and the middle finger will naturally point in the positive y-direction (upward).

Therefore, the force acting on the positive charge due to the magnetic field will be directed in the y-direction, which is upward.

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Answer:

the one that is clicked in the photo I think is right

The specific brain mass: decreases if body mass increases.

Due to the specific brain mass is the ratio of brain mass to body mass is inversely proportional when the body mass increases, the specific brain mass decreases.

If we calculate the specific brain mass of a person with a brain mass of 2 kg and a body mass of 50 kg and then with a body mass of 60 kg we have:

specific brain mass (50 kg) = 2 kg/50 kg = 0.04

specific brain mass (60 kg) = 2 kg/60 kg = 0.03

We can state that the specific brain mass decreases if the body mass increases.

It is the amount of mass associated with a person's body

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The acceleration a1 of the block when it passes through its equilibrium position can be expressed as: a1 = -a (m/k) where a is the amplitude of the oscillation, m is the mass of the block, and k is the spring constant.


When the block passes through its equilibrium position, the net force acting on it is zero.

At this point, the spring force and the gravitational force cancel each other out. Therefore, the acceleration of the block is also zero at this point.
However, as the block moves away from the equilibrium position, the spring force begins to dominate over the gravitational force and causes the block to accelerate towards the equilibrium position.

The acceleration is directly proportional to the displacement from the equilibrium position and is given by a = -kx/m, where x is the displacement.
When the block reaches the maximum displacement (amplitude) a, the spring force is at its maximum and the gravitational force is negligible. At this point, the acceleration is given by a = -a (m/k).
In conclusion, the acceleration of the block when it passes through its equilibrium position is zero. However, as it moves away from the equilibrium position, the acceleration is given by a = -a (m/k). This expression shows that the acceleration is directly proportional to the amplitude of oscillation, inversely proportional to the mass of the block, and inversely proportional to the spring constant.

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Answer:

2.205 pounds

Explanation:

5.5 kg is 2.205 lbs. hope this helps!

The work required to stop the car is equal to its kinetic energy:work = 1,728,282 J

To move the 1,200-N crate at constant speed of 3.6 m along the floor against a friction force of 250 N, we need to overcome the force of friction. The work required to do this is given by the equation:

work = force x distance

The force we need to overcome is the force of friction, which is 250 N. The distance we are moving the crate is 3.6 m. Therefore, the work required is:

work = 250 N x 3.6 m
work = 900 J

(b) To move the crate vertically, we need to lift it against gravity. The work required to lift the crate is given by the equation:

work = force x distance

The force we need to overcome is the weight of the crate, which is 1,200 N. The distance we are lifting the crate is also 3.6 m. Therefore, the work required is:

work = 1,200 N x 3.6 m
work = 4,320 J

(c) To stop the 1,670-kg car traveling at 149 km/h, we need to overcome its kinetic energy. The kinetic energy of the car is given by the equation:

kinetic energy = (1/2) x mass x velocity^2

The mass of the car is 1,670 kg and its velocity is 149 km/h, which is equivalent to 41.4 m/s. Therefore, the kinetic energy of the car is:

kinetic energy = (1/2) x 1,670 kg x (41.4 m/s)^2
kinetic energy = 1,728,282 J

To stop the car, we need to dissipate all of its kinetic energy.

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Answer:

Know what you need and what to discard

Explanation:

Knowing what to do with all your things/information helps declutter and to become more organized.

If the pressure stays constant at atmospheric pressure, the balloon containing methane gas will have a volume of 4.80 L at 114 °C. However, if the pressure changes, the final volume will be different.

To solve this problem, we need to use the combined gas law equation, which relates the pressure, volume, and temperature of a gas,
(P1 * V1) / T1 = (P2 * V2) / T2
where P1 and P2 are the initial and final pressures (which we can assume to be constant), V1 is the initial volume, V2 is the final volume (what we're trying to find), T1 is the initial temperature, and T2 is the final temperature.

We're given that the initial volume (V1) is 2.40 L, the initial temperature (T1) is 57.0 °C, and the final temperature (T2) is 114 °C. We're trying to find the final volume (V2). We're not given the pressure, but we can assume it's constant (since the balloon isn't being compressed or expanding).

Plugging in the values we have, we get,

(P1 * 2.40) / 57.0 = (P2 * V2) / 114

We can simplify this equation by multiplying both sides by 114,

(P1 * 2.40 * 114) / 57.0 = P2 * V2

Now we can solve for V2 by dividing both sides by P2,

V2 = (P1 * 2.40 * 114) / (57.0 * P2)

Since we don't know the pressure, we can't solve for the exact final volume. However, we can make some assumptions. For example, if we assume that the pressure stays constant at atmospheric pressure (which is around 1 atm), we can plug that value in for P1 and P2:

V2 = (1 * 2.40 * 114) / (57.0 * 1) = 4.80 L

Therefore, the balloon carrying methane gas will have a capacity of 4.80 L at 114 °C if the pressure remains constant at atmospheric pressure. However, the ultimate volume will vary if the pressure varies.

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We an see all three objects clearly in the visible part of the spectrum, even though the peak intensity might lie outside that region because we perceive only what lies in the visible region.

The sun and Sirius A emits light in every part of the electromagnetic spectrum. But our eyes cannot perceive every frequency of light. We see only what can be perceived by a human eye. Just because we cannot see other spectrum does not mean that it is not present.

The visible spectrum of light is 400 nm to 780 nm. The colours are:

Therefore, we can see all three objects clearly in the visible part of the spectrum, even though the peak intensity might lie outside that region because we perceive only what lies in the visible region.

The given question is incomplete. The complete question is:

Consider three objects - Sirius A, Sun and light bulb. We can see all three objects clearly in the visible part of the spectrum, even though the peak intensity might lie outside that region. why is this so?

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Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

Take the direction of motion to be the positive direction. The crate slows to a rest from 30.0 m/s in a matter of 5.0 s, so it has acceleration a such that

0 = 30.0 m/s + a (5.0 s)   →   a = -6.0 m/s²

At the moment its speed is 0, the crate has a net force of s + f acting in negative direction, where s and f denote the magnitudes of the stopping force (s = 250 N) and the friction force, respectively. By Newton's second law, we have

(-s) + (-f) = (100 kg) (-6.0 m/s²)

250 N + f = 600 N

f = 350 N

The friction force is proportional to the normal force by a factor of µ, the coefficient of kinetic friction. There is no movement in the up- and downward directions, so Newton's second law says

(-w) + n = 0

where w is the weight of the crate and n is the magnitude of the normal force. So

n = w = (100 kg) (9.80 m/s²) = 980 N

Then

f = µ n

350 N = µ (980 N)

µ = (350 N) / (980 N) ≈ 0.357

The net work must be done on the 48 g particle moving to the left at 29 m/s to move to the right at 45 m/s is 28.524 Joules.

To change the direction and speed of a 48 g particle from moving to the left at 29 m/s to moving to the right at 45 m/s, the net work done on the particle can be calculated using the work-energy theorem. The work-energy theorem states that the net work done on an object is equal to the change in its kinetic energy.

First, convert the mass of the particle to kg:

48 g = 0.048 kg

Next, calculate the initial and final kinetic energies:

Initial kinetic energy (KE_i) = 0.5 × mass × (initial velocity)²

KE_i = 0.5 × 0.048 kg × (-29 m/s)²

KE_i = 20.076 J

Final kinetic energy (KE_f) = 0.5 × mass × (final velocity)²

KE_f = 0.5 × 0.048 kg × (45 m/s)²

KE_f = 48.6 J

Now, use the work-energy theorem to find the net work done:

Net work (W) = KE_f - KE_i

W = 48.6 J - 20.076 J

W ≈ 28.524 J

Therefore, approximately 28.524 Joules of net work must be done on the particle to cause it to move to the right at 45 m/s.

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The potential difference is 0.063 V.

The potential difference is defined as the work done in moving a charge of 1 coulomb from one point to another.

An electron microscope is a microscope that uses an accelerated beam of electrons.

The formula given by De Broglie for the wavelength is as follows:

λ is the wavelength.

λ = h / p

 = h / mv

 = h / √2×m×q×V

where h is planks constant

q is the charge

m is the mass

4.5 * 10⁻⁹  = 6.63 * 10⁻³⁴ / √(2×9.31×10⁻³¹×1.6×10⁻¹⁹×V)

On solving for V we get

V = 0.063 V

Hence, the potential difference is 0.063 V.

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