Answer:
7200 secs
Explanation:
Power is the rate at which work is done. Mathematically, it is represented as:
Power (P) = Energy (E) /Time (t)
P = E/t
Power is measured in Watt (W).
Energy is measured in Joule (J).
Time is measured in seconds (s).
In calculating for the power, we must expresed the energy in joules and the time in seconds.
For the question given above, we must convert 2 hours to seconds before calculating the power.
To convert from hours to seconds, we simply do the following:
1 hr = 3600 secs
Therefore,
2 hrs = 2 x 3600 = 7200 secs
Therefore, the value for the time, t will be 7200 secs.
Why does an astronaut weigh less on the moon than on Earth?
Answer:
Hope I Helped
Explanation:
gravitational attraction on the Moon is much less than it is here on Earth, and a person weighs less on the Moon. This weaker gravity is why we have the famous images of the Apollo astronauts taking “one giant leap for mankind” on the Moon's surface.
A massive, gravitationally-bound system of stars, stellar remnants, interstellar medium, and dark matter:
a. AGN.
b. Dark matter.
c. Galaxy.
d. Nebula
Answer:
c. Galaxy
Explanation:
A massive, gravitationally-bound system of stars, stellar remnants, interstellar medium, and dark matter
This is a definition for a galaxy.
Hence the correct option is c.
find a unit vector that has the same direction as the given vector.
Answer: we divide the vector by its magnitude.
Explanation:
A satellite weighing 5,400 kg is launched into orbit 30,000 km above sea level. The mass of Earth is 6.0 × 1024 kg and its radius is 6,400 km. The gravitational constant is 6.673 × 10–11 N•m2/kg2. What is the gravitational force of Earth on the satellite in scientific notation with two decimals.
A satellite weighing 5,400 kg is launched into orbit 30,000 km above sea level. The mass of Earth is 6.0 × 1024 kg and its radius is 6,400 km. The gravitational constant is 6.673 × 10–11 N•m2/kg2 . What is the gravitational force of Earth on the satellite in scientific notation with two decimals.
–1.6 × 103 N
–1.63 × 103 N
–2.4 × 103 N
–5.27 × 104 N
The gravitational force of Earth on the satellite, given that the satellite is launched into orbit 30000 km above sea level is 1.63×10³ N
How do I determine the gravitational force?The gravitaional force between two objects can be obtained by using the following formula:
F = GM₁M₂ / r²
Where
F is the gravitaional force G is the gravitational constant M₁ and M₂ are the masses of the objects r is the distance apartThe following data were obtained from he question:
Mass of satellite (M₁) = 5400 = 5.4×10³ KgHeight (h) = 30000 km = 30000 × 1000 = 30000000 mMass of Earth (M₂) = 6.0×10²⁴ KgRadius of Earth (R) = 6400 km = 6400 × 1000 = 6400000 mDistance apart (r) = R + h = 6400000 + 30000000 = 36400000 mGravitational constant (G) = 6.673×10¯¹¹ Nm²/Kg²Gravitational force (F) =?The gravitaional force can be obtained as shown below:
F = GM₁M₂ / r²
F = (6.673×10¯¹¹ × 5.4×10³ × 6.0×10²⁴) / (36400000)²
F = 1.63×10³ N
Thus, the gravitational force is 1.63×10³ N
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A 1.5 kg baseball is pitched at 38 m/s and is hit by the batter. It heads directly back at the pitcher at 27 m/s.
a) Find the impulse applied to the ball.
b) If the bat is in contact with the bat for 0.45 sec, how much force was applied.
Show all your work.
Answer:
The initial velocity of the ball is +38.0 m/s. The final velocity is -27.0 m/s.
momentum = mass x velocity
(mass x final velocity) – (mass x initial velocity)
(1.5)(-27) – (1.5)(38) = -97.5
The impulse applied to the ball is -97.5 kg m/s
impulse = force x time interval
force = impulse/time interval
-97.5/0.45 s = - 216.6
The force applied was 216.6 N.
Inside a freely-falling elevator, there would be no A) gravitational force on you. B) apparent weight for you. C) both of these D) none of these.
Inside a freely-falling elevator, there would be no apparent weight for you.So option B is correct.
Inside a freely-falling elevator, there is still a gravitational force acting on you. However, since both you and the elevator are falling at the same rate, you would experience a sensation of weightlessness. Your apparent weight, which is the force exerted on a body due to gravity, would be zero. This is because there is no contact force between you and the elevator floor that would provide a normal force to counteract gravity. Therefore, the correct option is that there would be no apparent weight for you.
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Of the following numbers: 0.0034 m, 45.6 m, and 1234 m, _____ is the least precise.1) 0.0034 m2) 45.6 m3) 1234 m4) none
ANSWER:
3) 1234 m
STEP-BY-STEP EXPLANATION:
Precision refers to how close two measurements are to one another. The highest number with a significant digit is the most precise, the number that has the most significant figures. Therefore, the less accurate is the opposite.
Which means that in this case, the least precise number is 1234 m.
Snails crawl very slowly. If a garden snail crawls at 0.013 m/s north, how far will it travel in 60 seconds?
Answer:
.78 m/s north
Explanation:
Pls give brainliest if I correct
a 9.0×10−2 g honeybee acquires a charge of 24pc while flying. the earth's electric field near the surface is typically (100 n/c, downward).
(a) How many electrons were added to or removed from the honeybee? (b) What is the ratio of the electric force on the bee to the bee’s weight (Fe/Fg)? (c) What electric field strength and direction would allow the bee to hang suspended in the air without effort?
(a)Number of electrons added or removed from the honeybee 1.50 x 10^17 electrons.
To determine the number of electrons added or removed from the honeybee, we use the equation Q = Ne, where Q is the charge acquired by the bee, e is the charge of an electron (-1.602 x 10^-19 C), and N is the number of electrons. Rearranging the equation, we get N = Q/e = (24 pc)/(1.602 x 10^-19 C/e) = 1.50 x 10^17 electrons.
(b) The electric force on the bee is given by Fe = Eq, where E is the electric field strength and q is the charge of the bee. Substituting the given values, we get Fe = (100 n/C)(9.0 x 10^-8 C) = 9.0 x 10^-6 N.
The weight of the bee is given by Fg = mg, where m is the mass of the bee and g is the acceleration due to gravity. Substituting the given values, we get Fg = (9.0 x 10^-5 kg)(9.81 m/s^2) = 8.83 x 10^-4 N. Therefore, the ratio of the electric force on the bee to the bee's weight is Fe/Fg = (9.0 x 10^-6 N)/(8.83 x 10^-4 N) = 0.0102.
(c) For the bee to hang suspended in the air without effort, the electric force on the bee should be equal and opposite to the weight of the bee. Therefore, we have Fe = Fg, or Eq = mg. Solving for E, we get E = (mg)/q. Substituting the given values, we get E = (9.0 x 10^-5 kg)(9.81 m/s^2)/(9.0 x 10^-8 C) = 9.81 x 10^3 N/C, directed upward.
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Which statements are true regarding refraction? Check all that apply.
a) Light bends towards the normal when entering a higher index of refraction
b) Light bends towards the normal when entering a lower index of refraction
c) Light bends away from the normal when entering a higher index of refraction
d) Light bends away from the normal when entering a lower index of refraction
Light bends away from the normal when entering a higher index of refraction.
What is refraction ?In physics, refraction is the change in direction produced by a wave's speed as it travels from one medium to another. Waves, for example, travel quicker in deep water than in shallow water. When an ocean wave approaches a beach obliquely, the portion of the wave farther from the beach moves quicker than the portion closer to the beach, causing the wave to swing around until it moves perpendicular to the shoreline. Sound waves travel faster in warm air than in frigid air. At night, the surface of a lake cools, and any sound that moves upward is refracted down by the higher layers of air that are still warm. As a result, sounds such as speech and music.
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When an object slides,there is less friction than when it rolls
Answer:
False
Explanation:
Rolling friction takes place when an object rolls on the surface. Sliding friction takes place when two surfaces are rubbed against each other. Rolling friction is much less than sliding friction for same pair of bodies. When one body rolls upon another, there is theoretically no sliding or slip between them.
How do you find the gravitational force between two objects with the same mass?
The formulation for gravitational force does have the variables F, G, m1, m2, and r2.
The product of something like the gravitational constant as well as the masses of both the two items, divided with the square of such distance separating the two objects, would be the equation for the gravitational force among two things.
The formula is given as:
Force = (Multiplication of g, m ) / square of distance among both the objects.
= F = (G × M × m (mass)) / r²
where,
Force = F
Gravitational Constant = G
Mass of one object = M
Mass of another object = m
Distance = r
Since all of the items in this situation share the same mass, the gravitational force equation is,
F = (G X M X m(mass)) / r² (distance)
Gravitational force was the force utilized by the earth to pull an item toward it. Issacs Newton made the discovery after seeing an apple fall from either the tree.
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snell's law depends on the refractive indexes of the materials as well as on the _____ of the angles of the light rays.
Snell's law depends not only on the refractive indexes of the materials but also on the "angle of incidence" and "angle of refraction" of the light rays.
Snell's law describes the relationship between the angles of incidence and refraction when light passes through the interface between two different materials. It states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indexes of the two materials.
Mathematically, Snell's law is expressed as:
n₁ * sin(θ₁) = n₂ * sin(θ₂),
where n₁ and n₂ are the refractive indexes of the first and second materials, respectively, and θ₁ and θ₂ are the angles of incidence and refraction, respectively.
Therefore, the accurate determination of the angles of incidence and refraction is crucial for applying Snell's law to analyze the behavior of light as it passes through different media.
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CS
A bicyclist steadily speeds up from rest to 9.00m/s in 3.10s.
How far did she travel during this time?
unit
Calculate the specific heat of a metal from the following data. A container made of the metal has a mass of 3.7 kg and contains 16 kg of water. A 2.3 kg piece of the metal initially at a temperature of 179°C is dropped into the water. The container and water initially have a temperature of 16.0°C, and the final temperature of the entire system is 18.0°C.
Number? Unit?
The specific heat of the metal is 436 J/kg°C.
A physical quantity called specific heat is used to determine the amount of heat required to raise the temperature of a substance. This is also referred to as the thermal capacity of the material. As a result, the specific heat of a material is defined as the quantity of heat required to increase the temperature of one gram of the substance by one degree Celsius or Kelvin.
The metal's specific heat, based on the given data, can be calculated using the following formula:
Q = m × c × ΔT where, Q = quantity of heat transferred, m = mass of the material, c = specific heat of the material, ΔT = change in temperature. To find the specific heat of the metal, we'll use the mass of the metal, the specific heat of water, and the change in temperature between the metal and the water. The quantity of heat transferred, Q, is equal to the amount of heat absorbed by the water and the metal. As a result, the quantity of heat transferred is equal to:
(16 kg of water × 4186 J/kg°C × 2°C) + (3.7 kg of container × c metal × 2°C) + (2.3 kg of metal × c metal × (18°C - 179°C)) = 0
Solving for c metal gives us the following:
c metal = 436 J/kg°C
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How long does it take a bicycle to travel 100 m if it goes a speed of 15 m/s?
The time taken for the bicycle to travel the given distance at the given velocity is 6.667 seconds.
Given the data in the question:
Distance travelled by the bicycle; \(S = 100m\)
Speed or velocity of the bicycle; \(v = 15m/s\)
Time taken for the bicycle to travel the given distance; \(t = ?\)
We know that speed is the rate of change of position of an object with respect to time.
That is to say, Speed = Distance / Time
Hence, Time = Distance / Speed
\(t = \frac{S}{v}\)
So, to get our time "t", we simply substitute in our given values
\(t = \frac{100m}{15m/s}\)
\(t = 6.667 s\)
Therefore, the time taken for the bicycle to travel the given distance at the given velocity is 6.667 seconds.
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Which of the following can actually escape from inside a black hole's event horizon?
a. Protons
b. Very high energy gamma rays
c. Electrons
d. Neutrinos
e. None of the above
Once anything, including protons, electrons, gamma rays, and neutrinos, crosses the event horizon of a black hole, it is impossible for it to escape due to the extreme gravitational pull. so, correct option is e)None of the above
Inside a black hole's event horizon, the gravitational pull is so strong that nothing, not even protons, electrons, or any form of electromagnetic radiation such as gamma rays, can escape it. Neutrinos, which are very low-mass particles, also cannot escape the event horizon.
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A cell of emf 18v has an internal resistance of 3ohm . the terminal p.d of the battery becomes 15v when connected by a wire. find the resistance of the wire.
Answer:
Resistance = 15 Ohms
Explanation:
Given the following data;
Emf voltage = 18 V
Internal resistance = 3 Ohms
Potential difference = 15V
To find the resistance of the wire;
First of all, we would determine the current flowing through the wire.
Mathematically, the terminal potential difference is given by the formula;
V = E - IR
Where;
V is the terminal potential difference.
E is the electromotive force (emf).
I is the current.
R is the internal resistance.
15 = 18 - I*3
15 = 18 - 3I
3I = 18 - 15
3I = 3
I = 1 Amperes
Next, we find the resistance of the wire;
Voltage = current * resistance
Substituting into the formula, we have;
15 = 1 * resistance
Resistance = 15/1
Resistance = 15 Ohms
Study this model of a gravitational slingshot. then answer the questions. in this model, the velocity of the spacecraft at position 2 is the velocity of the craft at position 4. at position 1, the direction of the spacecraft changes because of . position 3 represents the .
In this model of a gravitational slingshot, the velocity of the spacecraft at position 2 is the same as the velocity of the craft at position 4.
At position 1, the direction of the spacecraft changes because of the gravitational pull of the planet. Position 3 represents the point of closest approach to the planet, where the gravitational force is the strongest. The gravitational slingshot effect increases the spacecraft's velocity as it passes the planet and moves away from it, thus allowing it to reach greater speeds than would be possible otherwise.
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How many wavelengths are seen in this image of a sound wave? three four six ten
There are three wavelengths seen in the image of a sound wave.
The image of a sound wave shows three complete waves, each consisting of a crest (highest point) and a trough (lowest point).
A wavelength is defined as the distance between two adjacent crests or troughs of a wave.
Therefore, since there are three complete waves shown in the image, there are three wavelengths present.
It is important to note that the number of wavelengths visible in an image of a wave depends on several factors, including the frequency and amplitude of the wave, as well as the resolution and quality of the image.
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dựa vào tính chất ảnh của vật tạo bởi gương phẳng hãy vẽ ảnh của vật sáng AB có dạng mũi tên được đặt theo vị trí tạo với GB một góc 60 độ
Explanation:
good luck with the one that was on the one that has to be done
How does the
gravitational attraction
between people
compare to the gravitational
attraction between the
people and Earth?
Attraction between people is Gravitation while people and earth is Gravity.
Every body in the universe attracts every other body with a force called force of gravitation. The attraction between sun and earth , attraction between table and chair lying in a room ..etc. are examples of gravitation. Gravitation is the weakest of four basic forces in nature. However , its most important force as it has its contribution in initiating the birth of stars and controlling the structure and evolution of entire universe.
Gravity is the special case of gravitation. If one of the attraction body is earth then gravitation is gravity.
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part b what is the direction of this potential difference? that is, does the potential increase or decrease along the direction of the current?
To maintain the original flux, induced current is in the direction of original current. Hence, potential difference will increase in the direction of current.
Does potential decrease or increase in the direction of current?In the direction of the electric field, electric potential decreases because electric potential is the work done against the direction of electric field.
The direction of an electric current is the direction in which a positive charge would move and electric current flows from higher to lower electric potential.
If a charge is moving in the direction that it would normally move, then its electric potential energy is decreasing. If a charge is moved in a direction opposite to that it would normally move, then its electric potential energy is increasing.
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What is the maximum speed at which a car can safely travel around a circular track of radius 142 meters if the coefficient of friction between the tires and the road is 1.07? Include units in your answer. Answer must be in 3 significant digits.
Given that the radius of the circular path is r = 142 m and the coefficient of the friction is
\(\mu=1.07\)The condition for the car to travel safely is
Frictional force = centrifugal force
\(\mu mg=\frac{mv^2}{r}\)Here, m is the mass of the car and the acceleration due to gravity is g = 9.8 m/s^2.
v is the maximum speed of the car.
\(\begin{gathered} v=\sqrt[]{ugr} \\ =\sqrt[]{1.07\times9.8\times142} \\ =38.58\text{ m/s} \end{gathered}\)A man running at 5 M/S increases his velocity to 10 M/S in 2 Seconds. What was his acceleration?
when an object is allowed to fall freely near the surface of the earth, the gravitational pull is such that the object falls 16 ft in the first second, 48 ft in the next second, 80 ft in the next second, and so on. a. find the total distance a ball falls in 6 s.
b. find a formula for the total distance a ball falls in n seconds.
a) The total distance a ball falls in 6 seconds is 576 feet.
b) The formula for the total distance a ball falls in n seconds is:
S_n = 16n * (n + 1) / 2
a. To find the total distance a ball falls in 6 seconds, we need to sum up the distances it falls during each second. Based on the given information, the distances are:
1st second: 16 ft
2nd second: 48 ft
3rd second: 80 ft
We can observe a pattern here: the distance increases by 32 ft each second (16, 48, 80, 112, 144, 176). So, the distances for the remaining seconds are:
4th second: 112 ft
5th second: 144 ft
6th second: 176 ft
Now, we can sum up these distances: 16 + 48 + 80 + 112 + 144 + 176 = 576 ft. Therefore, the total distance a ball falls in 6 seconds is 576 feet.
b. To find a formula for the total distance a ball falls in n seconds, we can notice that the sequence of distances forms an arithmetic progression with the first term a = 16 and the common difference d = 32. The formula for the sum of the first n terms of an arithmetic progression is:
S_n = n * (2a + (n - 1)d) / 2
In our case, S_n represents the total distance a ball falls in n seconds. Plugging in the values for a and d, we get:
S_n = n * (2 * 16 + (n - 1) * 32) / 2
Simplifying, the formula for the total distance a ball falls in n seconds is:
S_n = 16n * (n + 1) / 2
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An explanation for planetary differentiation is_____________. question 5 options: all the planets are different colors and some have life, while others do not different scientist are chosen to explore planet similarities is the separation of different constituents of planetary materials resulting in the formation of distinct compositional layers. denser material tends to sink into the center and less dense material rises toward the surface. planets have different orbits around the sun and therefore consist of varying elements
One hypothesis for planetary differentiation is the process through which various layers with diverse chemical and/or physical features arise.
A planet's trajectory around a star, a natural satellite's path around a planet, or an artificial satellite's course around a space object or place, such as a planet, moon, asteroid, or Lagrange point, are examples of orbits in celestial mechanics.
A spacecraft, planet, moon, star, or other object travels on a curved route called an orbit when it is dragged by the gravity of another object.
The force of gravity is what pulls objects with mass in space. An orbit is a path an object follows as it travels around a certain location in space, such as the Moon's orbit of the Earth.
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63. The magnetic force acting on a moving charge is given by the product of three quantities,
namely
చలనంలో ఉన్న ఆవేశంపై పనిచేయు అయస్కాంత బలం మూడు రాశుల లబ్దానికి సమానం అని
(1) charge, speed, electromotive force
ఆవేశం, వడి, విద్యుతచ్చాలక బలం
archarge, magnetic flux, magnetic flux density
ఆవేశం, అయస్కాంత అభివాహం, అయస్కాంత అభివాహ సాంద్రత
(3) charge, speed, magnetic flux density
ఆవేశం, వడి, అయస్కాంత అభివాహ సాంద్రత
(4) charge, speed, current
ఆవేశం, వడి, విద్యుత్ ప్రవాహం
Answer:
the correct one is 3
Explanation:
The magnetic force is described by the expression
F = q v x B
The bold indicate vectors, q is the charge, v the velocity and B the magnetic induction
This expression can be written in scalar form
F = q v B sin θ
where θ is the angle between velocity and induction.
The direction of the force is perpendicular to the vectors.
When revising this expression the force depends on the electric charge, the speed of the particle and the induction of the magnetic field
therefore, checking the possible answers, the correct one is 3
the phosphorus ion is larger than a neutral phosphorus atom, yet a zinc ion is smaller than a neutral zinc atom. which of the following statements best explains why?
The difference in size between the phosphorus ion and neutral phosphorus atom, the zinc ion and neutral zinc atom, is correct statement to the change in electron configuration the gain or loss of electrons during ionization.
The difference in size between a phosphorus ion and a neutral phosphorus atom, as well as a zinc ion and a neutral zinc atom, can be explained by the change in electron configuration resulting from ionization. The phosphorus ion has gained electrons, leading to increased electron-electron repulsion and larger size, while the zinc ion has lost electrons, resulting in a stronger attraction between the remaining electrons and the nucleus, leading to a smaller size.
When a neutral atom becomes an ion, it either gains or loses electrons, resulting in a change in its electron configuration. In the case of the phosphorus ion, it gains three electrons to achieve a stable electron configuration, resulting in a net negative charge. The additional Periodic table electrons introduce increased electron-electron repulsion, causing the electron cloud to expand, and hence the phosphorus ion to be larger than the neutral phosphorus atom.
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In which scenario will an athlete's wrists be under tension?
A.
striking a punching bag
B.
lifting a barbell overhead
C.
completing a push-up
D.
pulling a rope in tug-of-war
Answer:
I think the answer would be D.
Explanation:
It could be b or d, the reason that I think that it is d is because lifting does not directly involve your wrist.
Hope this helps!
Answer:
The answer is D
Explanation:
Tension is the working of muscle against muscle (especially dynamic tension).
Participating in tug of war creates tension as the working of your muscles is against the working of someone else's muscles, effectively creating tension.