Answer:
The SI unit of work is Joule
Answer:
S.I. unit of work is Joule. Work done when a force of 1 Newton displaces the body through a distance of 1 metre in the direction of force.
Explanation:
What would Hubble's constant be if we found one galaxy moving away at 30,000 km/s at a distance of 600 Mpc?
Answer:
H₀ = 1.6 x 10⁻¹⁸ s⁻¹
Explanation:
The Hubble's Constant can be found by the following formula:
[tex]v = H_o D\\\\H_o = \frac{v}{D}[/tex]
where,
H₀ = Hubble's Constant = ?
v = speed of galaxy = 30000 km/s = 3 x 10⁷ m/s
D = Distacance = 600 Mpc = (6 x 10⁸ pc)(3.086 x 10¹⁶ m/1 pc)
D = 18.52 x 10²⁴ m
Therefore,
[tex]H_o = \frac{3\ x\ 10^7\ m/s}{18.52\ x\ 10^{24}\ m}[/tex]
H₀ = 1.6 x 10⁻¹⁸ s⁻¹
2. Which of the following does not belong to the special names of latitude?
A. Equator
C. Tropic of Cancer
B. Prime Meridian
D. Tropic of Capricorn
Answer:
B Prime meridian
as all the others are name of latitudes
but prime meridian is a longitude
How does sound travel from its source to your ear?
(a) by changes in air pressure
(b) by vibrations in wires or strings
(c) by electromagnetic waves
(d) by infrared waves
Answer:
The answer is B
Explanation:
How does a magnet exert a force without touching
another object?
Magnets create a field of influence that
attracts or repels magnetic objects.
Magnets physically make objects move.
Someone must make a magnet force stuff
to move.
Answer:
Magnets create a field of influence that
attracts or repels magnetic objects.
Explanation:
Hope it helps :)
Answer: The magnet has a magnetic field that either attracts or repels another magnet or magnetic metal. It is because of this magnetic field that things move.
Explanation: N/A
A student uses 80 joules of energy to lift a backpack in a time of 0.75 seconds. How much power
does the student have?
Answer:
P = 106.7 W
Explanation:
Given that,
Work done in lifting a backpack, W = 80 J
It is lifted in 0.75 seconds
We need to find the power of the student. The power of an object is defined as work done per unit time. So,
[tex]P=\dfrac{W}{t}[/tex]
Put all the values,
[tex]P=\dfrac{80}{0.75}\\\\P=106.7\ W[/tex]
So, the power of the student is 106.7 W.
Ventajas y desventajas de la energía eléctrica??
Answer:
Advantages and Disadvantages of Electric PowerAdvantages:Electric power has many advantages domestically and industrially, as most of the equipment run by electric power. Brightness in the night is only possible by the use of electricity. Almost all the factories and industries are running due to electric power. The advantage of electric power is its reliable and uninterrupted supply runs the equipment efficiently and continuously. The transportation of electricity is easy once the transmission lines are functional. They work for years and need no or very less maintenance. The invention of electric power is one of the best inventions which have changed human life drastically. It allows people to do more leisure activities.
Disadvantages:In the conventional system to generate electric power, coal is burnt to generate heat which boils the water to produce steam. The steam produced is used to run the turbines which in turn generate the electricity. This is a very old method to generate electricity which produces too much air pollution as a by-product. Due to the burning of coal, carbon monoxide, carbon dioxide, different oxides of sulphur and nitrogen are pumped into the atmosphere which pollutes it badly. As carbon dioxide is the greenhouse gas and its excessive presence in the atmosphere raises the earth’s temperature.
Distribution of electric power is in two types of current, AC and DC. Alternating current is 3 to 4 times more dangerous as compared to direct current. It causes more muscle contraction as it reduces skin resistance by stimulating sweating
Answer:
Explanation:
Electricity can be used to heat either storage or continuous flow water heaters, and can also be used as a booster to solar or heat pump water heating systems.
The advantage of electricity is its reliable supply. However, in terms of sustainability and energy efficiency, conventional electric hot water heating is not a preferred option except as a booster system.
Conventional electric systems are less energy efficient than solar and heat pump systems, and generating electricity from fossil fuels produces greenhouse gas emissions. As well as these environmental costs, rising electricity prices also provide an incentive to seek more efficient energy sources.
Help please!!
What are the three criteria that determine if a wave is a sound wave?
Answer:
Wavelength, Amplitude, Time-Period, Frequency and Velocity or Speed.
Explanation:
Sound wave can be described by five characteristics: Wavelength, Amplitude, Time-Period, Frequency and Velocity or Speed. The minimum distance in which a sound wave repeats itself is called its wavelength. That is it is the length of one complete wave
Answer: Sound wave can be described by five characteristics: Wavelength, Amplitude, Time-Period, Frequency and Velocity or Speed.
Explanation:
The minimum distance in which a sound wave repeats itself is called its wavelength. That is it is the length of one complete wave.
The half‐life of Uranium‐237 is 5.83 x 10^5 seconds. What is the decay constant?
Answer:
λ = 1.19 x 10⁻⁶
Explanation:
The relationship between the half-life of an element and the decay constant of that element is given by the following formula:
[tex]T_{1/2} = \frac{0.693}{\lambda} \\\\\lambda = \frac{0.693}{T_{1/2}}[/tex]
where,
[tex]T_{1/2}[/tex] = half-life = 5.83 x 10⁵ s
λ = decay constant = ?
[tex]\lambda = \frac{0.693}{5.83\ x\ 10^5\ s}[/tex]
λ = 1.19 x 10⁻⁶
The upper layer of soil consisting of rock particles, water, air, and organic matter is the
Answer: Bedrock
Explanation:
Bedrock is the solid layer of rock beneath the soil. Soil is a mixture of rock particles, minerals, decayed organic material, air, and water. The decayed organic material in soil is humus, a dark-colored substance that forms as plant and animal remains decay.
Can someone answer this science question NO LINKS !!!!
Answer:
Point x.
Explanation:
The potential energy of an object is simply defined as the energy stored in an object by virtue of its location. Mathematically, it is expressed as:
PE = mgh
Where
PE => is the potential energy
m => is the mass of the object
g => is acceleration due to gravity
h => is the height
From the formula i.e PE = mgh, we can see that the potential energy (PE) is directly proportional to the height (h).
This simply indicates that as the height increases, the potential energy will increase and as the height decreases, the potential energy will also decrease.
Now, let us consider the question given above.
Point x indicates the greatest height attained by the ball. Therefore, the ball will have it's greatest potential energy at point x.
Object A and Object B have the same volume of 10 cm³. Object A has a mass of 20 grams. Object B has a mass of 50 grams. Which object will have the greater density and why?
Answer:
Object B has greater density
desity A=20/10=2 g cm^-3 . density B=50/10=5 g cm^-3
the object that has greater mass has the greater density because the volume of the those two objects are same
state and explain any effect on sensitivity of liquid in a glass thermometer (i) reducing the diameter of capillary tube
Answer:
please give me brainlist and follow
Explanation:
The measuring sensitivity of liquid-in-glass thermometers increases with the amount of liquid in the thermometer. The more liquid there is, the more liquid will expand and rise in the glass tube. For this reason, liquid thermometers have a reservoir to increase the amount of liquid in the thermometer.
Which of these scenarios describes circular motion?
es )
A)
The moon orbiting the Earth
B)
A cannonball flying from a cannon
C)
A car moving along a straight track
D)
The pendulum of a grandfather clock
A)
The moon orbiting the Earth
A projectile is launched from the ground with an initial velocity of 12ms at an angle of 30° above the horizontal. The projectile lands on a hill 7.5m away. The height at which the projectile lands is most nearly
A- 1.78m
B- 3.10m
C- 5.34m
D- 6.68m
E- 12.0m
Answer:
A. 1.78 m
Explanation:
Given;
initial velocity of the, u = 12 m/s
angle of projection, θ = 30°
the range of the projectile, R = 7.5 m
To obtain the height through which the projectile lands, we must calculate the maximum height reached by the projectile.
[tex]H = \frac{u^2\ sin^2\theta}{2g} \\\\H = \frac{(12)^2\times (sin(30))^2}{2 \times 9.8} \\\\H = \frac{144 \times (0.5)^2}{19.6} \\\\H = 1.84 \ m[/tex]
Therefore, the height is most nearly 1.78 m
A flight from london to barcelona takes two hours. It covers a distance of 900 miles. Calculate the speed of the plane in miles per hour
Answer:
Speed = 450 miles per hour
Explanation:
Given the following data;
Time = 2 hours
Distance = 900 miles
To find the speed of the plane;
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex]
Substituting into the formula, we have;
[tex]Speed, S = \frac{900}{2}[/tex]
Speed = 450 miles per hour
Answer: The speed of the plane in miles/ hour is equal to 450miles/ hour.
Explanation:
Speed has the property of magnitude ( size) but no direction. For example, an object moving at a speed of 40m/s has a higher speed that one moving at a speed of 20m/s.
The SPEED of an object is defined as the rate of change of distance moved with time. Thus, if a journey from London to Barcelona is 900miles and takes 2 hours. The speed of the plane is determined using the formula below:
Average speed = distance/ time
Distance = 900miles
Times = 2hours
Therefore speed = 900 ÷2
SPEED = 450miles/hour
Note that speed is measured in meter per second. But according to the instruction given from the question, it was stated that the speed should be calculated in miles per hour. Therefore the answer is 450miles/hour.
A block of mass 2.5kg is pressed against a spring and compresses the spring to a length of
10.0 cm. Then, the block is released and begins to move to the right as the spring returns
to its natural length of 21.4 cm. The spring has a spring constant of 88 N/m. Using Hooke's
Law, determine the force in the spring.
Pay attention to your units (specifically your values of spring length). Answer in units of
Answer:
10.032 N.
Explanation:
From the question given above, the following data were obtainedb
Mass (m) = 2.5 Kg
Final length = 10.0 cm
Original length = 21.4 cm
Spring constant (K) = 88 N/m
Force (N) =?
Next, we shall determine the compression of the spring. This can be obtained as follow:
Final length = 10.0 cm
Original length = 21.4 cm
Compression (e) =?
e = Original length – final length
e = 21.4 – 10
e = 11.4 cm
Next, we shall convert 11.4 cm to m. This can be obtained as follow:
100 cm = 1 m
Therefore,
11.4cm = 11.4 cm × 1 m / 100 cm
10 cm = 0.114 m
Finally, we shall determine the force. This can be obtained as illustrated below:
Compression (e) = 0.114 m
Spring constant (K) = 88 N/m
Force (N) =?
F = Ke
F = 88 × 0.114
F = 10.032 N
Thus, the force in the spring is 10.032 N
In the eastern US, hurricanesusually form over the warm waters of the Caribbean Sea and travel north. When they are over the cold waters of the North Atlantic Ocean, would they become more powerful or less powerful than they were when they were over the warm Caribbean? Explain why.
please answer no files links answer ASAP please
Answer:
Less powerful
Explanation:
Hurricanes rely on warm water. It sucks heat energy from the water to use for fuel. Warmer water means more moisture, which also mean a bigger and/or stronger hurricane. The North Atlantic is definitely much colder than the Caribbean so the hurricane will not have much fuel.
Have a great day!
If Nitrogen gains three electrons, what will its charge be? *
Answer:
It's change will form the nitride ion
3. When atoms gain or lose electrons, the atom becomes an
Answer:
An atom that gains or loses an electron becomes an ion
Explanation:
Answer:
Ion
Explanation:
An atom that gains or loses an electron becomes an ion. If it gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion
(c) Another spring has a spring constant of 250 N/m.
Calculate the work done in stretching the spring by 0.30 m.
State the unit.
Use the equation
E = 12 x K x x2
See the picture and Anwser This
Answer:
20 m/s
Explanation:
Look at the time on the x-axis. Go up from 2 seconds until you reach a point. From that point go to the left and read from the y-axis.
Say what main energy change
takes place in the following
examples.
a) clockwork toy
b) boy kicking a football
c) boiling kettle on a gas ring
d) person walking upstairs
Answer:
b) boy kicking a football
Explanation:
it 's because the ball was at rest but when it was kicked, it starts to more
Conservation of Matter states that the reactants have to equal the _______.
A.products B.enablers
2. Products and reactants in a balanced chemical reaction have the same number of _______ of each element.
A.atoms B.molecules
3. If the equation on the board had shown 3 atoms of carbon on the reactants side, how many atoms of carbon would need to be represented on the products side?
A.2 B.3
Answer:
1. A. Products
2. A. Atoms
3. B. (3)
Explanation:
1. Conservation of Matter states that the reactants have to equal the products.
2. Products and reactants in a balanced chemical reaction have the same number of atoms of each element.
3. Three (3) atoms of carbon would need to be represented.
Number of atoms on the left and on the right side of the balanced chemical reaction is the same, for example: Mg + 2HCl → H₂ + MgCl₂. There are two hydrogen atoms, two chlorine atoms and one magnesium atom on both side of chemical reaction.
14) A heater is rated at 495W and connected to a 110V supply calculate the
current following through the element? *
I = 4.5 A
Explanation:
P = VI ---> I = P/V
I = (495 W)/(110 V)
= 4.5 A
If the distance between two objects is decreased to 1 10 of the original distance, how will it change the force of attraction between them? A. The new force will be 100 times more than the original. B. The new force will be 20 times more than the original. C. The new force will be 1 20 of the original. D. The new force will be 1 100 of the original. E. The new force will be 1 10 of the original.
(A) It will 100 times larger than the original force.
As the square of the distance between the two charges increases, the force's strength decreases. Because of this, if the gap between the two charges is doubled, the attraction or repulsion between them weakens and drops to one-fourth of its initial strength. Thus, option A is correct.
What decreased distance change the force of attraction?As their separation rises, so does the force of attraction or repulsion between two objects. Additionally, when the spacing between things gets smaller, the force of attraction or repulsion between the objects gets stronger. Distance affects electrical forces significantly.
Gravitational forces will be reduced as separation distance increases because they are inversely proportional to the square of the distance between the two interacting objects. When two things are moved apart, their gravitational attraction to one another also lessens.
Therefore, The new force will be 100 times more than the original.
Learn more about force here:
https://brainly.com/question/12986588
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What is the product of an oxidation reaction?
Ozone
Oxygen
Oxide
Answer:
Oxide
Explanation:
Ozone and oxygen are oxidising agents
[tex]O _{3} \: \: ozone \\ \\ O _{2} \: \: oxygen[/tex]
Answer:
Oxygen
Explanation:
The name oxidation actually originates from the word oxygen so the question answers it's self.
In case you don't know what oxidation is:
Oxidation occurs when an atom, molecule, or ion loses one or more electrons in a chemical reaction. When oxidation occurs, the oxidation state of the chemical species increases. Oxidation doesn't necessarily involve oxygen! Originally, the term was used when oxygen caused electron loss in a reaction.
Have a great day <3
The power of crane is 30000 watt. What work will be done by it in 10 sec?
Explanation:
power =work done/time
work=power ×time
work =30000×10
work =300000j
stay safe healthy and happy.If a person displaces a mass of
60kg through 300 metres in 1
Minute, what is the power?
?
Answer:
Power = 2940 Watts
Explanation:
Given the following data;
Mass = 60 kg
Height = 300 meters
Time = 1 minutes = 60 seconds
To find the power;
First of all, we would determine the potential energy possessed by the person due to height.
We know that acceleration due to gravity is equal to 9.8 m/s².
Potential energy can be defined as an energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
[tex] P.E = mgh[/tex]
Where,
P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
Substituting into the formula, we have;
P.E = 60 * 9.8 * 300
P.E = 176400
Next, we find the power using the following formula;
Power = energy/time
Power = 176400/60
Power = 2940 Watts
1. Which of the following is correct about the sampling distribution of the sample mean
using the Central Limit Theorem?
A. The mean of the sampling distribution of the means is not equal to the mean of the
population
B. As the sample size n increases, the sampling distribution of the means approaches a normal
distribution
C. The variance of the sampling distribution of the means is equal to the variance of the
population multiplied by the sample size n
D. The standard deviation of the sampling distribution of the means is equal to the standard
deviation of the population multiplied by the square root of the sample size n.
2. Which of the following refers to the standard deviation of a sampling distribution?
A. It is the sum of squares.
B. It is the standard tror of the nitai.
C. It only applies only to population data.
D. It can be larger than the standard deviation for the population.
3. Who is the French-born Mathematician who proved the first version of the Central
Limit Theorem?
A. Abraham de Moivre
B. Aristotle
C. Aleksander Lyapunov
Answer:
In my opinion I think that the answer is C sorry If I get this wrong.
For every 120 joules of energy input a car wastes 85 joules , find the useful energy output of the car ?
Answer:
35 Joules
Explanation:
Applying
Input Energy(Q) = Useful energy output(U)+Wasted Energy(W)
Q = U+W.............................. Equation 1
Make U the subject of the equation
U = Q-W................... Equation 2
From the question,
Given: Q = 120 Joules, W = 85 Joules
Substitute these values into equation 2
U = 120-85
U = 35 Joules