Who developed the steady-state hypothesis for the universe? When was it developed?
Answer:
The steady-state theory was first proposed by Sir James Jeans in the 1920s, but it really got a boost in 1948 when it was reformulated by Fred Hoyle, Thomas Gold, and Hermann Bondi.
Explanation:
True
Answer:
The steady-state theory was first proposed by Sir James Jeans in the 1920s, but it really got a boost in 1948 when it was reformulated by Fred Hoyle, Thomas Gold, and Hermann Bondi.
Explanation:
The steady-state theory was first proposed by Sir James Jeans in the 1920s, but it really got a boost in 1948 when it was reformulated by Fred Hoyle, Thomas Gold, and Hermann Bondi.
what do you mean by efficency of simple machine is 80%?what is ouput work
It means that machine can do work up to 80% and 20% of the energy is wasted on friction
Libby's dog stands 79 yard tall, and Jeff's dog stands 56 yard tall. How much taller is Jeff's dog than Libby's dog?
Answer:
-23 yards taller or sum like that
Explanation:
this isn't physics though
help people -_-!
thanks in advance
Answer: answer
Explanation:For equilibrium
Weight = Tension
mg=T
∴T=4×3.1π=12.4πN (as can be inferred from the question)
Y=
△l/l
T/A
=
1000
0.031
/20
12.4π/π(
1000
2
)
2
=
4×0.031
12.4×20×1000×(1000)
2
=2×10
12
N/m
2
What cause sound? And how do it work
Answer:
Simple yet quick mechanical vibrations of various elastic substances produce sound. When they are moved or struck to vibrate, the auditory nerve of the ear receives the same sort of vibrations, which are subsequently perceived by the mind.
How much time is required for an elevator to lift a 2000 kg load up 28 m from the ground level, if the motor can produce 13 kW of power?
Answer:
W = P * t work = work/time * time
t = W / P time required
t = 2000 kg * 9.8 m/s2 * 28 m / P = 549,000 J / 13000 J/s
t = 42.2 sec
Note: 1 kW = 1000 J/sec
Time required for an elevator to lift a 2000 kg load up 28 m from the ground level, if the motor can produce 13 kW of electric power will be 42.22 seconds .
What is Electric Power ?The time rate of doing work or delivering energy is called Electric Power
electric Power can be calculates by
electric Power = Work done / time
Given :
mass (m) = 2000 kg
height (h) = 28m
electric power (P) = 13 kW = 13 * 10^3
acceleration due to gravity (g) = 9.8 m/s^2
Since , the load has been taken to a certain height , hence work must be done and that work done is stored in the form of Potential Energy
Work done = m* g * h
= 2000 * 9.8 * 28
13000 = 2000 * 9.8 * 28 / time
Time = 2000 * 9.8 * 28 / 13000
Time = 42.22 seconds
Time required for an elevator to lift a 2000 kg load up 28 m from the ground level, if the motor can produce 13 kW of electric power will be 42.22 seconds .
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One of the main arguments that animal rights advocates present is that animals have rights because they __________. A. Have moral agency B. Are capable of suffering C. Cannot defend themselves D. Are the property of humans Please select the best answer from the choices provided A B C D.
One of the main arguments that animal rights advocate present is that animals have rights because they are capable of suffering.
What are animal rights?Animal rights are ethical visions founded on the trust that animals deserve the space to live their own lives without being affected by mortal interests.
Humans have to always give freedom to animals for their living without their personal interests.
The animal is capable to suffer this is an argument that comes always on the animal rights sheet.
Hence the option B is correct.
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A car travels 460km in 7 hours. How would you calculate the speed?
Answer:
speed = 65.7 km/h
Explanation:
speed = distance over time, so you'd do 460 km/7 hrs to get your speed in km/h
What is the wavelength of a radar signal that has a frequency of 27 GHz? The speed of light is 3 × 108 m/s. Answer in units of m.
Explanation:
speed of light= c
wave length= L
frequency= f
c=Lf → L= c/f → L= 3 × 10⁸/ 27 × 10⁹ → L = 1/90 ≈ 0.011 m
What is the speed of the beta particles???
no links
The speed of the beta particles is about 90% of the speed of the light that is 2.7 x 10^8 m/s.
Explanation:
Hope it helps you!!Explanation:
The speed of β particles is of the order of 2.7 × 10⁸m/s in vacuum
When there is a break in an electric tools insulation.
Answer:
A break in an electric tool's or machine's insulation can cause its metal parts to become “hot” or energized, meaning that they conduct electricity. Touching these energized parts can result in an electric shock, burn or electrocution.
Please help I’ll make u brainliest please and thank you
What is the difference between heat and temperature?
A. Heat is the transfer or thermal energy; temperature is a measurment of thermal energy
B. Heat is a measurement of thermal energy; temperature is a transfer of thermal energy
Answer: A.
Explanation: I’m pretty sure that’s it, but I’m not 100% sure. But that’s the best option.
9. Your friend claims that you can prove that two parallelograms are congruent
by proving that they have two pairs of congruent opposite angles. Is your
friend correct? Explain your reasoning.
Yes , the two parallelograms are considered congruent if they have two pairs of congruent opposite angles.
How two parallelograms are equal?The opposite angles of the parallelogram are congruent which shows equality of two parallelograms so we can conclude that the two parallelograms are considered congruent if they have two pairs of congruent opposite angles.
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Discuss the relationship between mental and physical health
Answer:
Mental and physical health is fundamentally linked. There are multiple associations between mental health and chronic physical conditions that significantly impact people’s quality of life, demands on health care and other publicly funded services, and generate consequences to society. The World Health Organization (WHO) defines: health as a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity. The WHO states that “there is no health without mental health.”
Nowhere is the relationship between mental and physical health more evident than in the area of chronic conditions. The associations between mental and physical health are:
1. Poor mental health is a risk factor for chronic physical conditions.
2. People with serious mental health conditions are at high risk of experiencing chronic physical conditions.
3. People with chronic physical conditions are at risk of developing poor mental health.
The social determinants of health impact both chronic physical conditions and mental health. Key aspects of prevention include increasing physical activity, access to nutritious foods, ensuring adequate income and fostering social inclusion and social support. This creates opportunities to enhance protective factors and reduce risk factors related to aspects of mental and physical health.
Understanding the links between mind and body is the first step in developing strategies to reduce the incidence of co-existing conditions and support those already living with mental illnesses and chronic physical conditions.
Explanation:
Hope this helps
Brainliness please and thank you
A television has a mass of 19kg what is the weight of the television
Answer:
186 N
ExplanatioN
Weight is essentially just a measurement of the force of gravity, so you can use this equation.
F = mg
Force = Mass × Acceleration due to Gravity
F = 19kg × 9.8m/s^2. (Acceleration due to Gravity on Earth.)
F = 186.02N
How is a sound wave made by plucking a guitar string?.
Answer:
i have no clue
Explanation:
The mass of the earth is 5.98 × 10^24 kg and the mass of the moon is 7.35 × 10^22 kg. If the gravitational force is 1.98 x 10^20 N, what is the
distance to the moon?
r² = G.m₁m₂/F
r² = 6.67 x 10⁻¹¹ x 5.98 x 10²⁴ x 7.35 x 10²² / 1.98 x 10²⁰
r = 3.85 x 10⁸ m
21. True or false The half life is the time for half the stable isotope to decay.
Answer:
true
Explanation:
half life is the time an isotope takes to decay
list 2 examples of objects demonstrating mechanical energy.
A boy holds a heavy package for one hour. He is very tired but has not done any work. Explain why he did not do any work.
Answer:he's not applying force or motion
Explanation:
p=f & m
Based on what you know about the interactions between stars and other interstellar media, select all of the correct statements from the following list. Molecular clouds are of very low density; ultraviolet photons permeate the cloud to break up all molecules. Much interstellar dust comes from stellar atmospheres. Clouds of neutral hydrogen have masses of hundreds of solar masses. Molecular clouds are where stars are born. The intercloud medium is cool. Coronal gas is ejected from supernova explosions.
The statements 'much interstellar dust comes from stellar atmospheres', 'molecular clouds are where stars are born' and 'coronal gas is ejected from supernova explosions' are TRUE. Molecular clouds are stars in formation.
What are molecular clouds?Molecular clouds are regions into the space where celestial bodies (stars) are born in a galaxy.
The formation of stars always occurs within these molecular clouds, especially in the disk-shaped area of spiral galaxies.
Molecular clouds can be considered areas into space that are formed by very cold and dark matter.
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A positive charge of 6. 0 × 10-4 C is in an electric field that exerts a force of 4. 5 × 10-4 N on it. What is the strength of the electric field?.
The strength of the electric field will be 0.75 NC⁻¹ . Electric force F acted per unit positive electric charge q is known as the strength of the electric field.
What is the strength of the electric field?The electric, or Coulomb, force F exerted per unit positive electric charge q at any place, can be used to calculate the strength of an electric field E at any position.
It is given by;
E = F/q
The given data in the problem is;
q is the value of charge=6. 0 × 10⁻⁴C
F is the electric force = 4. 5 × 10⁻⁴ N
E is the strength of electric field=?
The electric field strength is found by the formula;
[tex]\rm E=\frac{F}{q} \\\\ \rm E=\frac{4.5 \times 10^{-4}}{6 \times 10^-4} \\\\ \rm E= 0.75\ N/C[/tex]
Hence the strength of the electric field will be 0.75 NC⁻¹ .
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A farmer pulls the cord on the bell on his barn to signal everyone that it is time to eat. Which of the following factors would most impact the speed of the sound waves coming from the ringing bell?
(A) The type of metal that the bell is made of
(B) The force that the bell was struck with to start the vibrations
(C) The direction of the wave as the sound vibrates away from the bell
(D) The temperature and medium through which the sound is traveling
(D) The temperature and medium through which the sound is traveling would most impact the speed of the sound waves coming from the ringing bell ?
How is the total kinetic energy of an object calculated?.
Answer:
ke = 0.5 x m x v^2
Explanation:
A race boat, starting from rest, uniformly accelerates for 4 seconds. If the boat moves
70 meters during the acceleration period, what is its rate of acceleration?
Answer:
uui 2+6=8m calculator hunny work's
A particular light source gives off light waves with a measured wavelength of
2. 0 X 10-7 m. What is the frequency of the light source?
a. ) 6. 67 X 10-15 Hz
b. ) 6. 0 X 1011 Hz
c. ) 1. 5 X 1015 Hz
d. ) Not enough information
The frequency of the light source is 1.5 x 10¹⁵ Hz.
Frequency of the light sourceThe frequency of the light source is determined using the following equations;
c = fλ
where;
c is speed of light
f is the frequency
λ is the wavelength
f = (3 x 10⁸) / (2 x 10⁻⁷)
f = 1.5 x 10¹⁵ Hz
Thus, the frequency of the light source is 1.5 x 10¹⁵ Hz.
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POTENTIAL I KINETIC ENERGY
7. Where is kinetic energy decreasing A B C D
8. Where is kinetic energy increasing A B C D
9. Which location has more potential energy then B? A B C D
10. Which location has more kinetic energy then B? A B C D
ANSWER THESE 10 FOR ME
7kinetic energy is decreasing in B
The two loops in (Figure 1) have equal currents in opposite directions. What current will create a magnetic field strength of 850 μT at the center?
The current that will produce the given magnetic field strength is 4,250r ( r is the distance from the wire).
Magnetic field strengthThe magnetic field strength at the center of the loop is calculated as follows;
B = (μ₀I)/(2πr)
where;
B is magnetic field strengthμ₀ is permeability of free spaceI is the currentr is the distance from the wireSolving for the current;
I = (2πrB)/(μ₀)
[tex]I = \frac{2\pi \times r \times 850 \times 10^{-6}}{4\pi \times 10^{-7}} \\\\I = 4,250 r[/tex]
Thus, the current that will produce the given magnetic field strength is 4,250r ( r is the distance from the wire).
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How has florida contributed to america’s space race?.
Answer:
Florida's Cape Canaveral was central to the US victory in the space race. An isolated air force base was in Cape Canaveral near the ocean. This location allowed NASA scientists to test rockets freely.
Explanation:
How to Estimate your age in seconds ?
No Spamming ~
Answer:
Explanation:
First, remember your age.
Then, multiply it times 365 x 24 x 60 x 60.
Or basically, multiply it times 315.36 x 10⁵
