Please help mee please
Answer:
eV to Joules just multiply by 1.602 × 10^-19
Hence, 1.5eV = 1.5 × 1.602 × 10^-19 J
= 3.04 × 10^-19 J
It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then...
Select one:
a. the pulley rope is pulled 1 meter.
b. the pulley rope is pulled more than 1 meter, but less than 3 meters.
c. the pulley rope is pulled 3 meters.
d. the pulley rope is pulled more than 3 meters.
Answer:
b
Explanation:
It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then the pulley rope is pulled more than 1 meter, but less than 3 meters.
It takes less effort to lift a piano with a pulley. If the piano is lifted 3 meters, then. The correct answer is a. the pulley rope is pulled 1 meter.
When lifting a piano using a pulley system, the distance the pulley rope is pulled will be the same as the distance the piano is lifted. This is due to the mechanical advantage of the pulley, which reduces the amount of effort needed to lift the piano but does not change the distance the rope is pulled.
In a simple single fixed pulley system, where one end of the rope is attached to a fixed point and the other end is used to lift the piano, the distance the pulley rope is pulled will indeed be the same as the distance the piano is lifted.
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Why do we feel the force of gravity from the Earth but we don’t feel the force of gravity from the moon?
Answer:
The gravitational force on the moon is less than on Earth because the strength of gravity is determined by an object's mass. The bigger the object, the bigger the gravitational force. Gravity is pretty much everywhere. We just feel it in different ways depending on our state of motion.
Explanation:
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what will be the change in momentum caused by a net force of 240 N acting on an object for 3 seconds ?
Given the value of force applied in the given duration of time, the impulse or change in momentum caused by the net force is 720kgm/s.
What is Impulse?An impulse is simply a concept that involves the change in the momentum of an object when force is introduced for a period of time.
It is expressed as;
ΔP or Change in Momentum = F × t
Where F is force applied and t is the elapsed time.
Given the data in the question;
Force applied F = 240N = 240kgm/s²Time elapsed t = 3sImpulse ΔP = ?ΔP = F × t
ΔP = 240kgm/s² × 3s
ΔP = 720kgm/s
Given the value of force applied in the given duration of time, the impulse or change in momentum caused by the net force is 720kgm/s.
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Calculate the molar mass of sucrose:
Answer:
342 g/mole
Explanation:
Mass of the carbon = 12 g
Mass of the hydrogen = 1 g
Mass of the oxygen = 16 g
Given: Chemical Formula of the Sucrose = C12H22O11
Molar mass = 12 x 12 + 1 x 22 + 16 x 11
= 144 + 22 + 176
= 320 + 22
= 342 g/mole ➪ molar mass of the sucrose
342 g.
Explanation:
C12H22O11 ------> SugarCarbon has mass -> 12
Hydrogen has mass -> 1
Oxygen has mass -> 16
=> (12× 12 ) + (1 ×22 ) + ( 16 × 11 )
=> 144 + 22 + 176
=> 342 gram
__________________Molecular mass : The Molecular mass of a substance is the sum of the atomic masses of all atoms in a molecule of a substance, e.g ., Molecular mass of water is 18u.H2O = 2 × H + 1 × O=> 2 × 1 + 1 ×16 = 2+16= 18 u. Mass of one mole of a substance is called its molar mass. ___________________what is a Molecule?
A Molecule is the smallest Particle of an element or a compound capable of independent existence under ordinary conditions. It shows all the properties of tge substance.Describe the electric and magnetic fields of an electromagnetic wave.
Answer:The electric field and magnetic field of an electromagnetic wave are perpendicular (at right angles) to each other. They are also perpendicular to the direction of the EM wave. EM waves travel with a constant velocity of 3.00 x 108 ms-1 in vacuum.
Explanation:
Suppose sunlight just outside earth's atmosphere has an intensity of 1.47 kw/m2. calculate (a) em and (b) bm for sunlight there, assuming it to be a plane wave.
Intensity of the sunlight and magnetic field amplitude will be 1.03 ×10³ V/m and 3.43 ×10⁻⁶ T respectively.
What is a magnetic field?It is the type of field where the magnetic force is obtained. With the help of a magnetic field. The magnetic force is obtained, it is the field felt around a moving electric charge.
The intensity of the sunlight is found as;
[tex]\rm I = \frac{E_m^2}{2 \mu_0C} \\\\ E_m= \sqrt{2 \mu_0I_c} \\\\ E_m=\sqrt{(2 \times 4 \pi \times 10^{-7} m/A)(1.40 \times 10^3 \ W/m^2 )(2.988 \times 10^8 m/sec)} \\\\ E_m=1.03 \times 10^3\ V/m[/tex]
The magnetic field amplitude is found as;
[tex]\rm B_m= \frac{E_m}{c} \\\\\ B_m=\frac{1.03 \times 10 \ V/m^}{3 \times 10^8 \ m/sec} \\\\ B_m=3.43 \times 10^{-6} \ T[/tex]
Hence, intensity of the sunlight and magnetic field amplitude will be 1.03 ×10³ V/m and 3.43 ×10⁻⁶ T respectively.
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Find the markdown price. Shelly Ward purchased a mountain bike for 35 percent off the regular price of $899. how much is the markdown?
The markdown price for a mountain bike is $584.35
What is markdown price?Markdown price is the discount offered by the shopkeepers to the customers to increase the sales rate.
M.P = S.P (1-r/100)
The following expression can be used every time we have to find the markdown price.
Substitute Selling price S.P =$899 and the percent r =35/100 =0.35, we get
M.P = $899(1-0.35)
M.P =$584.35
Thus, the markdown price is $584.35
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ILL GIVE BRAINLIEST I PROMISE!
Option C, speed of light will increase as the light rays moves from water to air.
What is refraction of light?The refraction of light is the change in speed of light when it moves from one medium to another.
Light travels faster when it moves from a denser medium to a less dense medium while the speed of light decreases when light passes from a less to a more dense medium.
Water is more dense than air, thus speed of light will increase as the light rays moves from water to air.
Option C depicts increase in speed from water to air.
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The tape timer used in this experiment marks the paper tape with dots at fixed time intervals. How does it do that?.
The ticker tape is pulled through the timer once it's powered, which creates a dot along the length of this paper tape at fixed time intervals.
What is a ticker timer?A ticker timer can be defined as a scientific apparatus that is designed and developed to measure time in seconds. Thus, a ticker timer can be used to measure short intervals of time by making dots on a paper tape at regular (fixed) intervals.
By design, a ticker timer comprises a magnet, carbon paper disk and a ticker tape which is pulled through the timer once it's powered, so as to create a dot along the length of this paper tape at fixed time intervals.
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178 79 Au is a(n) __
of gold
Answer: No, but yes
Explanation:
EXPLAIN IT
A nuclear power plant is built alongside a river. what measurements should a monitoring station downstream record to be sure that the proper procedures are being followed at the power plant? density and radiation levels radiation levels and dust levels salt concentration and temperature temperature and radiation levels
Nuclear power plant should have monitoring units and water purifiers units, so thet they followed propress in the plant.
What is nuclear power plant?
Nuclear power plant is a structure that allows the generation of energy from the fission of toxic materials. It is usually due to the risk of accidents. Nuclear energy is very important for the generation of electricity in many countries.
Hence, water purifiers units should be used in the downstream to measure to protect river should be taken.
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Answer:
temperature and radiation levels
Explanation:
edge
A monochromatic beam of light is absorbed by a collection of ground-state hydrogen atoms in such a way that three different wavelengths are observed when the hydrogen relaxes back to the ground state.
Answer:
If the absorbed beam is monochromatic (one wavelength) then it excites the H atom to some state n.
When that state decays, some of the atoms may decay to state 1, others to state 2, and still others to state 3
The net energy emitted in such a case would depend on:
n -1, n - 2, n - 3 which would produce 3 different wavelengths
Voyager 1 and 2 sent back detailed information about all of the following except:
a.
the characteristics of all outer planets in our solar system
b.
the nature of our cosmic neighborhood at the edge of our galaxy
c.
details about saturn and jupiter
d.
components that make up our asteroid belt between mars and jupiter
Answer:
D
Explanation:
Components that make up our asteroid belt between mars and jupiter
On average, each square metre of the solar
panel above receives 1000 joules of energy
from the Sun every second. Use this figure to
calculate the power input (in kW) of the panel if
its surface area is 2 m?
1 m² = 1000 J/s = 1000 watt = 1 kW
so for 2 m²:
= 2 x 1 kW = 2kW
Why is it important to be careful interpreting absolute ages of clastic sedimentary rocks such as sandstones?
Answer:
You need to be careful when finding the true age of sedimentary rocks to understand its full history.
Explanation:
Does the efficiency of a motor depend on mass?
Practically yes
Efficiency=Output/inputSo
If mass is more output may come less so it affects the efficiency practically
But thepritically it doesn't
Answer:
Yes
Explanation:
Formula of motor efficiency
η = Input Load (E₀)/ Output Load(E₁)We know from simple physics that the energy of a body is directly proportional to its mass. Here, in the working of a motor, mass may not be involved directly, but the electrical energy required to provide a function will likely have more efficiency when working with lesser masses.
Can you help me I’m struggling?
where are most of the comets in our solar system found?
Answer:
some far beyond the edge of the solar system called the Oort Cloud, and some beyond Neptune in a region called the Kuiper Belt.
Explanation:
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Does this equation show that transmutation has taken place during decay?
Why or why not?
6128 Ni -> 6128 Ni + y
A. Yes, because the numbers of nucleons and atoms are conserved.
B. No, because there is conservation of the number of atoms as well as the number of nucleons.
C. Yes, because the nickel atoms remain nickel atoms with the same number of neutrons.
D. No, because high-energy electromagnetic waves are emitted.
Explanation:
Transmutation means change in neutron numbers u
Like for example
When Potassium (N=19 ) goes through beta decay it forms (N=20)
Here no change in neutrons (Same 28)
So no trnasmutaions.
Option B
A 1200 kg car moving at 2.5 m/s is struck in the rear by a 2600 kg truck moving at 6.2 m/s. If the vehicles stick together after the collision, what is their speed immediately after colliding?
Velocity: m/s
Answer: 5.0 m/s
Explanation:i had this question on my test
100 % verified!
Conservation of linear momentum
[tex]\\ \rm\Rrightarrow m1v1+m2v2=(m1+M2)v3[/tex]
[tex]\\ \rm\Rrightarrow 1200(2.5)+2600(6.2)=(1200+2600)V3[/tex]
[tex]\\ \rm\Rrightarrow 3000+16120=3800v3[/tex]
[tex]\\ \rm\Rrightarrow 19120=3800v3[/tex]
[tex]\\ \rm\Rrightarrow V3=5m/s[/tex](Approx)
Tyra pushes the pedals of her bicycle with her feet to make it go faster. Which of Newton's laws is demonstrated by this action
The impressed force increases when Tyra pushes the pedals of her bicycle, the momentum of the bike increases hence it moves faster.
What are the laws of motion?The Newton's laws of motion lay the foundation for dynamics. According to Newton's second law, the rate of change of momentum is directly proportional to the impressed force.
Hence, as the impressed force increases when Tyra pushes the pedals of her bicycle, the momentum of the bike increases hence it moves faster.
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When cell a sends a message to
cell b, ? occurs at cell
b.
a. osmosis
b. active transport
c. synaptic transmission
Answer:
c. Synaptic transmission
Explanation:
To transmit impulses/electronic signals around the body, nerve cells transfer messages across the synapse and the movement of the chemicals from one cell to the other is known as either diffusion or synaptic transmission.
Which field of science gives us the idea that spacetime is not just a flat grid but is
itself a physical entity that can be bent and molded?
A: General Relativity
B: Time dilation
C: quantum mechanics
D: gravitational physics
The field of science that gives us the idea that spacetime is not just a flat grid but is itself a physical entity that can be bent and molded is known as quantum mechanics. Thus, the correct option for this question is C.
What is Quantum mechanics?Quantum mechanics may be defined as a fundamental theory in physics that significantly provides a detailed description of the physical properties of nature at the scale of atoms and subatomic particles. It is basically the branch of physics that deals with the behavior of matter and light on a subatomic and atomic level.
Time dilation in the theory of special relativity is the “slowing down” of a clock as determined by an observer who is in relative motion with respect to that clock.
General relativity is the theory of gravity. The basic idea is that instead of being an invisible force that attracts objects to one another, gravity is a curving or warping of space. The more massive an object, the more it warps the space around it.
Therefore, quantum mechanics is the field of science that gives us the idea that spacetime is not just a flat grid but is itself a physical entity that can be bent and molded. Thus, the correct option for this question is C.
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what evidence is there suggesting ellipticals may form from the mergers of 2 or more spiral galaxies
Elliptical galaxies could be formed by the collision and merging of two spiral galaxies.
What is galaxy?Galaxy is the huge collection of stars, interstellar gases, dust particles, stones. Galaxies tend to come in two shapes such as spirals and ellipticals.
In spiral galaxies, the stars orbit in a very thin disk, and all the stars move in the same direction. Two or more spiral arms wind around the center just like a pinwheel.
Selecting a sample of about 50 spiral galaxies that have collided and in the process of merging into a single object. We took infrared images using the UH 88-inch (2.2-meter) telescope, and obtained spectra of these mergers using one of the Keck telescopes.
Infrared images are used to see, if the starlight in these objects decreases with distance from the center of the galaxy the way it does in spirals or the way it does in ellipticals. The light intensity decreases exponentially in outward direction from the centers of spirals, but it declines much more slowly with distance from the center for ellipticals. It is found that at least 45 out of 51 mergers are ellipticals.
Thus, most of these mergers really are evolving into elliptical galaxies.
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Most asteroids orbit the Sun between:
A.
Mercury and Venus.
B.
Mars and Jupiter.
C.
Neptune and Pluto.
D.
Saturn and Uranus.
Answer:
mars and jupiterrr
Explanation:
ty for all ur help love u
The atomic number of an element whose atoms have 12 protons and 10 neutrons is
Let each shake of the pennies or thumbtacks represent 1 year. what is the half life, in years, for the pennies in experiment 1? what is the half-life, in years, for the thumbtacks in experiment 2?
(5.4.3 lab - nuclear physics)
The half-life of the pennies in experiment 1 and 2 will be the time it takes for half the pennies to fall off after shaking.
What is Half-Life?Half-Life is the time required for half the amount one a given substance to disappear or decay.
The half-lives of substances are usually constant values.
For example, the Half-Life of radioactive carbon-14 is 5700 years.
Therefore, the half-life of the pennies in experiment one and two will be the time it takes for half the pennies to fall off after shaking.
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Marjorie drops an object from a height of h meters, and it hits the ground with a velocity of v m/s, as given by the function v equals the square root of 19.6 h. If the velocity of the object is 68.6 m/s, what was the height of the object before it was dropped? Round your answer to the nearest tenth.
Answer:
240.1 m
Explanation:
Potential energy ( mgh) is fully converted to Kintetic energy ( 1/2 mv^2)
equate them
mgh = 1/2 mv^2 divide by 'm'
gh = 1/2 v^2
9.8 h = 1/2 v^2
19.6 h = v^2 v = sqrt ( 19.6h) (as given)
68.6 = sqrt (19.6 h) solve for h = 240.1 m
If the volume of a container increases what
effect will this have on pressure? Why?
As the volume of the container increases the pressure inside will decrease because the atoms have more room to move around in.
Answer:
In a container of the same volume, a greater number of molecules results in greater pressure. Gas pressure increases as container volume decreases.
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