Answer:
stored
Explanation:
P. E . = m g h
represents STORED energy in the form of the height * acceleration of gravity * mass
Determine the work done to raise a mass of 8.0 kg through a height of 2.5 m on this planet.
Answer:
196 J
Explanation:
Formula
Work done(W) = Mass (m) x gravity (g) x height (h)Here, we are given :
m = 8.0 kgg = 9.8 m/s² (on Earth)h = 2.5 mSolving
W = 8 × 9.8 x 2.5W = 20 × 9.8W = 196 Jhellooooooooooo peopleeeee
How long does it take to travel?
120 miles at 40mph
Answer:
it takes 3 hours to travel
Explanation:
120 ÷ 40 = 3
Step 1. distance = speed * time or time = distance/speed.
Step 2. time = 120 miles/(40 miles/hour) = 3 hours.
Step 3. ANSWER: It would take 3 hours to travel 120 miles at 40 mph.
On an ice skating rink, a girl of mass 50 kg stands stationary, face to face with a boy of mass 80 kg. the children push off of one another, and the boy moves away with a velocity of 3 m/s. what is the final velocity of the girl? –1.9 m/s 1.9 m/s –4.8 m/s 4.8 m/s
The final velocity of the girl after the collision is determined as -4.8 m/s.
Final velocity of the girl
The final velocity of the girl is determined from the principle of conservation of linear momentum.
m1u1 + m2u2 = m1v1 + m2v2
50(0) + 80(0) = 50(v1) + 80(3)
0 = 50v1 + 240
50v1 = -240
v1 = -240/50
v1 = -4.8 m/s
Thus, the final velocity of the girl after the collision is determined as -4.8 m/s.
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Which event in the history of black holes happened after Einstein's theory of general
relativity was published in 1915?
A: John Michell coined the term “black holes.”
B: Pierre-Simon de Laplace mentioned the idea of black holes in a written work.
C: Karl Schwarzschild correctly analyzed the relationship between the size of a black hole and its mass.
D: John Wheeler concluded that if black holes did exist, light could not escape them.
Answer:
C: Karl Schwarzschild correctly analyzed the relationship between the size of a black hole and its mass.
Explanation:
Karl Schwarzschild correctly analyzed the relationship between the size of a black hole and its mass. The correct option is C.
What is Karl Schwarzschild's theory?A black hole is an area of spacetime in which gravity is so powerful that nothing, not even light or other electromagnetic waves, can escape. According to general relativity theory, a sufficiently compact mass can bend spacetime to generate a black hole.
Karl Schwarzschild, a German physicist, was the first to "find" black holes. In 1915, he proposed a general relativity solution that was applicable to the simple (i.e., nonrotating, uncharged, and boring) example of a perfectly spherical object contained in otherwise empty space.
These suggestions are now known as the Schwarzschild radius and the singularity. Every item is allocated a Schwarzschild radius, which is determined by the object's mass. Gravity's behaviour begins to become strange within this radius.
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All electromagnetic radiation in the optical portion of the em spectrum have what characteristics?
Ph11_UnitPacket2019
Page 30 of 38
3. A ray of light travels from air into a liquid. The ray is incident upon the liquid at an angle of 30.0 degrees
The angle of refraction is 19.9º.
a. What is the index of refraction for the liquid? 1901
1999
thin liquid could be.
Let's see
Use snells law
[tex]\\ \rm\Rrightarrow \dfrac{n_1}{n_2}=\dfrac{sini}{sinr}[/tex]
[tex]\\ \rm\Rrightarrow \mu=\dfrac{sin30}{sin19.9}[/tex]
[tex]\\ \rm\Rrightarrow \mu=0.5/0.34[/tex]
[tex]\\ \rm\Rrightarrow \mu=1.47[/tex]
It may be glass
A twirler’s baton is 0.76 m long and spins around its center. the end of the baton has a centripetal acceleration of 47.8 m/s2. how long does it take the baton to complete one spin? 0.31 s 0.56 s 4.3 s 70 s
The time it takes the baton to complete one spin is determined as 0.56 s.
Time of motion of the baton
The time of motion of the baton is calculated as follows;
a = 4π²R/T²
where;
R is radius of the wire = ¹/₂(0.76) = 0.38T² = 4π²R/a
T² = (4π² x 0.38)/47.8
T² = 0.3138
T = 0.56 s
Thus, the time it takes the baton to complete one spin is determined as 0.56 s.
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A 5-kg ball rolling at a speed of 3 m/s strikes a 2-kg ball at rest. The 5-kg ball then comes to a stop and the 2-kg ball begins to roll forward. Determine how fast the 2-kg ball is moving.
Velocity: _ m/s
Answer:
7.5m/s
Explanation:
Law of conservation of momentum: momentum in a system before collision equals to that after collision/
5kg*3m/s=2kg*v
15kgm/s=2kg*v
v=7.5m/s
The diagram shows different body planes.
X: frontal; Y: sagittal; Z: transverse
X: sagittal; Y: frontal; Z: transverse
X: transverse; Y: sagittal; Z: frontal
X: frontal; Y: transverse; Z: sagittal
The diagram shows different body planes. X shows sagittal,Y shows frontal and Z shows transverse axis. Option B is correct.
What is frame of reference?A frame of reference is a mathematical and physical coordinate system whose origin, direction, and scale are given by a collection of reference points.
1. Frontal Plane divides the body into front and posterior sections.
2. The Sagittal Plane divides the body into left and right halves.
3. The transverse plane divides the body into superior and inferior halves.
The diagram shows different body planes. X shows sagittal,Y shows frontal and Z shows transverse axis.
Hence,option B is correct.
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___ radars show everything in fhe sky from servere weather to birds and mosquitoes to tornado debris
Answers:
Polar
Dopper
Geostationary
Orbiting
Answer:
doppler
Explanation:
A force of 800 n is used to stop an object with a mass of 50 kg moving with a velocity of 35 m/s. how long will it take to stop this object?
variables:
equations:
answers
Answer:
KE = F * S initial kinetic energy will expended in stopping object
1/2 M V^2 = F * S
S = 1/2 * 50 * 35^2 / 800 = 38.3 m stopping distance
If you need to know the stopping time involved -
(V2 - V1) = a t where the change in velocity is 35 m/s
a = F / M = 800 / 50 = 16 m/s^2 deceleration of mass
t = 35 / 16 = 2.2 sec
The following diagram shows two meteors with masses of 1,000 kilograms and 3,000 kilograms spaced 10 meters apart. What is the magnitude of the gravitational force exerted by the 1,000 kg meteor on the 3,000 kg meteor? 2 × 10-9 N, 2 × 10-6 N, 7 × 10-10 N, 2 × 10-2 N
The attraction between masses as small as our bodies, or even objects the size of skyscrapers, is incredibly small. For example, two 1.0-kg masses located 1.0 meter apart exert a force of 6.7×10−11N 6.7 × 10 − 11 N on each other.Answer:
Explanation:
Even between objects the size of skyscrapers or masses as small as our bodies, there is incredibly little attraction. For instance, a force of 6.71011N is generated when two 1.0-kg masses are placed 1.0 meters apart. 6.7 10 11 N on top of one another.
What magnitude of gravitational force by the meteor?M/s2 is its SI unit. Its vector nature—which includes both magnitude and direction—makes it a quantity. The unit g stands for gravitational acceleration. At sea level, the standard value of g on earth's surface is 9.8 m/s2.
The magnitude of PQ is represented symbolically as | PQ |. The Distance Formula can be used to determine a vector's magnitude if its start and end points' coordinates are known.
Therefore, The distance between a vector's starting point P and ending point Q is its magnitude.
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Match each type of heat transfer method with its description.
Match each type of heat transfer method with its description.
Conduction | Convection | Radiation
relates to density differences within fluidsdoes not require a medium or physical contact to transfer heat. occurs during physical contact between solid objects not in thermal equilibriumAnswer↷Conduction ↪ occurs during physical contact between solid objects not in thermal equilibrium.
________________________________
Convection↪ relates to density differences within fluids.
________________________________
Radiation ↪does not require a medium or physical contact to transfer heat.
________________________________
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200 N of force is applied to an object causing it to accelerate at 10 m/s^2. What is the mass of the object?
[tex]~~~~F=ma\\\\\implies m = \dfrac{F}a = \dfrac{200~ N}{10~ ms^{-2}} = 20~ \text{kg}\\\\\text{The mass of the object is 20 kg.}[/tex]
How much force is required to accelerate a 12kg mass at 10m/s/s
Answer:
100N
Explanation:
Is it possible for an human body to be transparent or invisible?
Answer:
Yes, it is possible.
Explanation:
Hope this helps! :)
Answer:
it's possible since scientists have already progressed to making fully transparent & invisible human organs.
Can someone please answer this, ill give you brainliest Would be very appreciated.
The order is followed as
photosynthesisDecompositionCombustionRespirationDiffusionAnswer:
See below ~
Explanation:
Done from left to right :
Box 1 : Photosynthesis
Box 2 : Respiration
Box 3 : Combustion
Box 4 : Decomposition
Box 5 : Diffusion
You are talking to your grandmother—who grew up in the 1960s—about climate change. She asks you a lot of questions about the issue, and in the end, isn’t sure she believes it to be a problem. Upon reflection, what belief about climate that was popular in the 1960s might have influenced your grandmother’s conclusion that she isn’t sure climate change is a problem?
A.
Climate only consisted of temperature, rather than the modern belief that climate includes other aspects.
B.
The Earth had four climate stages, and we are not due for a fifth for 10,000 years.
C.
Climate change happened over hundreds and thousands of years, not quickly.
D.
The little ice age was still happening, so our temperatures should be going down.
When scientists talk about climate, they usually mention averages of rainfall, temperature, humidity, sunshine, wind, and other climatic influences that occur over a long period of time in a particular location.Thus option A is correct.
What climate only consisted of temperature?High latitude polar and arctic air masses (60° N and S and higher) regulate climate. These climates are distinguished by low temperatures, frequent precipitation, and an unexpectedly wide variety of subtypes.
A climatic data element, such as precipitation, temperature, wind speed, or humidity, is a measured characteristic that aids in describing the climate of a particular place or region.
Therefore, Climate only consisted of temperature, rather than the modern belief that climate includes other aspects.
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What are challenges faced by both modern and ancient engineers?
Answer:
Climate Chrises
Explanation:
Please help me with those multiple choice
Answer:
11. Light waves are electromagnetic (created by electromagnetic impulse)
12. Light waves in a medium are slower V = C / Nm where Nm is the index of refraction of the medium
13. The frequency of the vibration remains the same
14. The wavelength of light in the medium is less
λ = V / f and it was determined in 12 that the velocity is less in the medium
12. A child touches the metal leg of a chair. She says "The
cold is moving to my hand!" How would you (gently) correct
the child in physics terms
A child touches the metal leg of a chair. The temperature of metal leg is moving to her hand.
What is temperature?The temperature is the degree of hotness or coldness when an object is touched.
The metals are generally have less temperature compared to the surrounding temperature. When a child touches the leg of a metal chair, she feel cold, but the physical term is temperature which is moved to her hand.
Thus, temperature of metal leg is moving to her hand.
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Which type of radiation is associated with high frequency waves?
Answer:
Gamma rays
Explanation:
have the highest energies, the shortest wavelengths, and the highest frequencies. Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation.
In a nuclear reactor a moderator is used to
Answer: A material called moderator is used to slow down the neutrons released during nuclear fission. The source's neutrons have a high speed and energy. The neutrons' speed is slowed by heavy water or graphite moderators.
Explanation:
Can someone please answer this, ill give you brainliest Would be very appreciated.
Water cycle basically involves the change of water into liquid to vapour and again to liquid states through a cyclic manner .
The answers are
EvaporationTranspirationCondensationprecipitationrunoffseapageground waterCalculate the frequency of a wave which goes through 10 cycles in 5 s
Find the magnitude of the induced current that flows through the resistor shown in the figure at t=3 s, if the magnetic field through the wire loop of 3.0 cm radius changing with time according to this equation B=2t^2−3.
The magnitude of the induced current is, (I=9 /R). The principal of ohm's law is employed in the given problem.
What is induced emf?Emf is the production of a potential difference in a coil as a result of changes in the magnetic flux passing through it.
When the flux coupling with a conductor or coil changes, electromotive force, or EMF, is said to be induced.
The given data in the problem is;
B is the magnetic field,= 2t^2−3.
t(time)=3 sec
The induced EMF is found as;
[tex]\rm E= \frac{d \phi}{dt} \\\\\ \rm E= \frac{d(2t^2-3)}{dt} \\\\\ E=4t-3\\\\\ t= 3 sec \\\\ E=12-3 \\\\\ E= 9 \ V[/tex]
From ohm's law;
E=IR
I=E/R
I=9 /R
Hence,the magnitude of the induced current is, (I=9 /R).
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What happens in the gray zone between solid and liquid?
Answer:
Hence, the transition has to cross the grey zone from liquid to solid or solid to liquid. This grey zone transition is crucial, including the intermolecular forces acting on the molecules and each atom, making the change in state from hot to cold and cold to hot.
Explanation:
Answer:
Hence from liquid to solid or solid to liquid the transition has to cross the grey zone. This grey zone transition is is very crucial which includes the inter molecular forces acting on the molecules and each atoms which makes the change in state from hot to cold and cold to hot.
Explanation:
this is based on ideal gas law PV=nRT.
Where P is pressure, V is volume, R is gas constant and T is temperature. Hence from liquid to solid or solid to liquid the transition has to cross the grey zone.
This grey zone transition is is very crucial which includes the inter molecular forces acting on the molecules and each atoms which makes the change in state from hot to cold and cold to hot.
The best example is ice crystal formation and water formation from ice crystal .
Hence the inter molecular force of attraction happens to be involved with changes in grey zone
A 0.50 kg lead ball at 45 c is dropped into a calorimeter with water at 20 the final temperature of the ball-water system is 25c, what is the mass of the water? consider specific heat capacity of led = 128 / k * g degrees * c and specific heat capacity of water=4186 //kg^ c
Answer:
.0612 kg
Explanation:
I think your spec heat for lead should be 128 j /kg-K
Final lead temp is the same as the water 25 C Note that 1 K = 1 C degree
so lead goes from 45 to 25 C (or difference of 20 K)
Heat given up by the lead =
.5 kg * (20 K) * 128 j/ kg -C = 1 280 j
this heat is GAINED by the water going from 20 to 25 C
x kg * (5 C ) (4186 j/kg-C ) = 1 280 j
x = .0612 kg
Compare solar heating panels and solar electric panels.
pls I really need help
Answer:
We know that a solar electrical panel converts sunlight to electricity by means of solar cells and then, the electricity can be used as any electrical current.
I am not familiar with solar heating panels but assume that a liquid is heated by sunlight and then circulated thru the area that needs heating - it converts heat from sunlight to usable heat. The heat energy could also be stored and delivered at a different time (accumulated during the day and delivered at night). This is somewhat similar to a company freezing water at night when electricity is cheaper and then using the cooled water during the day for cooling.
