F = G M.m/r²
F = force, N
G = gravitational constant, 6.67 x 10⁻¹¹ Nm²/kg²
m,M = mass of object, kg
r = distance, m
F = 6.67 x 10⁻¹¹ x 69.3 x 52/1.2²
F = 1.669 x 10⁻⁷
Choose the best answer among the given alternative answers. 1. Two opposite forces acting perpendicular to an axis cause a. Back and forth motion c. Sliding motion b. Rotation d. No motion (at rest)
2. The part of an electric motor that reverses current in a segment of the coil is. a. Armature c. Brushes b. Commutator d. Battery that makes the
Answer:
C
Explanation:
A mover pushes a 20 kg crate across a level floor with a force of 200 n, but
a the crate accelerates at a rate of only 7.5 m/ s2 because a friction force
opposes the crate's motion. what is the magnitude of this force of friction?
200 n
force of friction
a. 50 n
b. 15 n
c. 25 n
d. 100 n
The magnitude of the force of friction between the crate and floor is 50 N.
Magnitude of the force of friction
The magnitude of the force of friction is determined from Newton's second law of motion.
F - Ff = ma
Ff = F - ma
Ff = 200 - (20 x 7.5)
Ff = 50 N
Thus, the magnitude of the force of friction between the crate and floor is 50 N.
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Unguarded live parts operating at 30,000 volts located above a working space must be elevated at least _____ above the working space.
Unguarded live parts operating at 30,000 volts located above a working space must be elevated at least 9.5' above the working space.
What is voltage?The voltage is the potential difference between the end of the conductor.
The place where electricity supply wires and power stations are present, the lives must protected. They must live far above the working space.
Thus, it must be 9.5' above the working space.
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The blackbody curve for a star named Zeta is shown below. The most intense radiation for this star occurs in what spectral band?
radio waves
infrared
visible light
microwaves
Answer:Visible lighlight
Explanation:
A student measures the weight of one bottle cap as 5.03 grams, so he calculates that the weight of 100
bottle caps will be 503 grams. The actual weight of 100 bottle caps is 495 grams. What is the student's percent error?percent error?
A standing wave is a wave that remains in a constant position.
true or false
Light of different wavelengths look different ______ to humans:
A.) visible spectrum
B.) electromagnetic spectrum
C.) colors
D.) absorption
Answer:
C) colors
Explanation:
The wavelengths of light determine the color that we see. Humans cannot see lightwave absorption, but we can see light in the form of colors.
Shorter wavelengths (indicating higher frequencies) look violet,
and Longer wavelengths (indicating lower frequencies) look more red
Identify evidence that supports the theories of continental drift and plate tectonics. put responses in the correct input to answer the question. select a response, navigate to the desired input and insert the response. responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. responses can also be moved by dragging with a mouse. glossopteris plant fossils found in several southern hemisphere continents. the same types of rocks are found on either side of the atlantic ocean. there are no ocean floor rocks older than 180 million years. the pattern of rock ages shows new rock forming at mid-ocean ridges and spreading away from the ridge in both directions. the shapes of south america and africa appear to fit together. the majority of earthquakes and volcanoes occur along easily recognized bands called tectonic plate boundaries. lystrosaurus reptile fossils are found on several southern hemisphere continents. the same type of sediment deposits are found in several southern continents. magnetism in rocks of different ages don't point to the same north pole locations. science
The evidence that supports continental drift and plate tectonics includes different fossils, the same rocks and the shapes of continents that fit together.
What is continental drift?Continental drift is a theory that states continents once were part of one big landmass known as Pangea.
Nowadays, the theory of continental drift proposed by Alfred Wegener has been replaced by plate tectonics.
In conclusion, the evidence that supports continental drift and plate tectonics includes fossils, the same rocks and the shapes of continents that fit together.
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The weight of an astronaut on the moon is the same as on Earth.
True
False
Answer:
False
Explanation:
This is due to the gravitational pull, since the moon does not have the same force or gravity like Earth, your weight would change.
☆anvipatel77☆
•Expert•
Brainly Community Contributor
name the quantity whose unit is 'newton'
astronomers have found water on mars.
venus has an atmosphere.
why do these planets not support life?
The thin atmosphere of Mars is thought to be due to the planet's lack of a magnetic field, which has allowed the Solar wind to blow away much of the gas the planet once had. Venus, despite still having a thick atmosphere of CO2, surprisingly has a similar problem
A snowboarder starts from rest at the top of a slope. They accelerate to 35 m/s over 9 seconds. What is their acceleration?
GA9.35 mis
OB. 0.25 m/s²
OC. 26 m/s²
OD. 3.88 m/s²
v=35m/s
t=9
a=35/9a=3.88m/s²Does 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.
How far did an object travel if they rode a bike at 15m/s for 5 seconds?
A. 75m
B. 3 m/s
C.20 m
Answer:
A) 75m
Explanation:
distance = speed x time taken
Here given:
speed: 15 m/s
time: 5 second
So, distance covered:
15 x 5
75 m
Distance
Speed×Time15(5)75mExplain how power loss in a hydraulic system can be minimised during standby
Answer:
there is.loss.of water
in rainy season
in thundering
etc.
Match the term to its best description.
Covalent
Electronegativity
Anion
Metallic
?
Determines what type of bond will form
?
Electronegativity of two atoms are similar
?
A type of covalent bond
?
Negative ion
A block and a ball have the same inertia and move with the same initial velocity across a floor and then encounter different ramps. The ramps are identical in every way except for the fact that there is enough friction for the ball to roll without slipping and the block slides without friction up the ramp. Which one makes it furthest up the ramp
The ball rolling without slipping will make it furthest up the ramp because it has greater kinetic energy.
Conservation of energy
The height rolled by each object can be determined by applying the principle of conservation of energy.
The ball rolling without slipping will have additional rotational kinetic energy.
The block won't have additional rotational kinetic energy.
Total K.E ball > Total K.K block
ΔP.E = ΔK.E
Thus, the ball rolling without slipping will make it furthest up the ramp because it has greater kinetic energy.
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Which two elements undergo fusion in the sun?
Answer:
In the core of the Sun hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom. During the process some of the mass is converted into energy.
The earth takes 375.25 days to orbit around the sun. Is the earth accelerating?
Answer:
Yes
Explanation:
Centripetal acceleration = a = v^2/r
Calculate the amount of current flowing through a circuit when the resistance is 2 ohms and the voltage supplied is 10 Volts.
What sport does not require a high level of fitness
What is the difference between saturated and unsaturated fat? Why are partially hydrogenated fats useful for making potato chips but not particularly healthy for humans to eat?
Saturated fats have the maximum number of hydrogens possible, while unsaturated fats consists of a double bond between two of the carbon atom.
The partially hydrogenated fats useful for making potato chips but not particularly healthy for humans to eat because of presence of trans fat.
What is partially hydrogenated fats?Partially hydrogenated fats have trans fat that can raises cholesterol level in heart and result in severe health complications like heart attack.
Each carbon have four bonds to react with. In saturated fats, each carbon has four hydrogens bonded and a straight structure is formed They are solid at room temperature. So, they are remain solid in arteries of heart and block it.
Unsaturated fats have a carbon, double bonded with another carbon and gives the molecule a bent structure. They remain liquid at room temperature and are healthier fats.
The potato chips are not healthy for humans to eat. The partially hydrogenated fats raise bad cholesterol and lowers good cholesterol. The trans fats increases the risk of heart disease and can lead to death of adults. The more trans fats eaten, the greater is the risk of heart attack.
Thus, partially hydrogenated fats useful for making potato chips but not particularly healthy for humans to eat because of presence of trans fat.
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Which telescopes must be placed in orbit around earth in order to observe short-wavelength radiation?.
Space telescopes must be placed in orbit around earth in order to observe short-wavelength radiation.
What is telescope?A telescope is an optical instrument that uses lenses, curved mirrors, or a combination of both to watch distant objects.
When atoms in a gas reach this temperature, they travel so quickly that when they collide, they release X-ray photons with wavelengths smaller than 10 nanometers.
Because the Earth's atmosphere prevents all X-rays from space, these wavelengths must be seen using space telescopes.
To study short-wavelength radiation, space telescopes must be put in orbit around the Earth.
Hence, space telescope is the correct answer.
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A car travels for 2 hours at a speed of 55 km/h. calculate the distance traveled
This is a uniform rectilinear motion (MRU) exercise.
We get the data:
d = ?, v = 55 km/h, t = 2 hr
To calculate the distance, multiply the speed by the time.
d = v * t
d = 55km/h * 2hr = 110kmThe distance traveled is 110 km.
Ultrasound was used to check for cracks in an aeroplane wing. The ultrasound pulse would be reflected from any cracks and from the end of the wing. The diagram shows the oscilloscope trace produced by the echo. How far along the wing was the crack? The speed of sound in metal is 5000m/s.
The depth of the crack along the aeroplane wing is determined as 1.5 m.
Depth of the echo reflection
The depth of the crack in the wing from which the echo is heard is calculated as follows;
d = (vt)/2
From the image;
time 1 = 0.4 mstime 2 = 0.8 msd1 = (5000 x 0.4 x 10⁻³)/2
d1 = 1 m
d2 = (5000 x 0.8 x 10⁻³)/(2)
d2 = 2 m
Average depth
d = (d1 + d2)/2
d = (1 + 2)/2
d = 1.5 m
Thus, the depth of the crack along the aeroplane wing is determined as 1.5 m.
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Answer:The answer is 2
A soccer ball and bowling ball, with the same areas and different masses, are dropped at the same time. How will their motions compare
O The bowling ball will fall faster due to its mass.
O The bowling ball will fall at a slower speed because its mass means it will have more air resistance.
O
The soccer ball will fall slower because it will be affected by air resistance.
O The objects will fall at the same speed because the effect of gravity on them is the same.
Answer:
Third option
Explanation:
IF you ignore air resistance, they will fall at the same rate due to the effect of gravity being the same on both ....BUT the third option seems to be correct as air friction is taken into account.... the bowling ball will be affected by air resistance too, bul less so..
What type of metal are conducting wires most often made of?
#16
Answer:
here
Explanation:
Copper is commonly used as an effective conductor in household appliances and in electrical equipment in general. Because of its low cost, most wires are copper-plated. You will often find electromagnet cores normally wrapped with copper wire
a car is traveling at 20 m/s and speeds up to 35 m/s in 5 seconds. What is the car's acceleration?
Answer: Acceleration =3m/s^2
Explanation:
A child pulls on a wagon with a force of if the wagon moves a total of in what is the average power delivered by the child?
Given the force exerted by the child to pull the Wagon through the given distance and time, the average power delivered by the child is 16.9 Watts.
This question is incomplete, the complete question is:
A child pulls on a wagon with a force of 75N. If the wagon moves a total of 42m in 3.1min, what is the average power delivered by the child?
What is Power?Power is simply the amount of energy transferred or converted per unit time.
It is expressed as;
P = W/t
Where W is work done and t is time elapsed.
But Work done is expressed as;
W = F × d
Where F is force applied and d is distance covered.
Hence;
Power = W/t = Fd / t
Given that;
Force exerted F = 75N = 75kgm/s²Distance covered d = 42mTime elapsed t = 3.1min = ( 3.1 × 60)s = 186sAverage power delivered P = ?Power = Fd / t
Power = ( 75kgm/s² × 42m ) / 186s
Power = (3150kgm²/s²) / 186s
Power = 16.9 kgm²/s³
Power = 16.9 Watts
Given the force exerted by the child to pull the Wagon through the given distance and time, the average power delivered by the child is 16.9 Watts.
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A Ball A and a Ball B collide elastically. The initial momentum of Ball A is 14.0kgm/s and the initial momentum of Ball B is -9.00kgm/s. Ball A has a mass of 2.00kg and is traveling at -5.00 m/s after the collision. What is the velocity of ball B if it has a mass of 3.00kg
The total momentum before collision is
14.0 kg•m/s + (-9.00 kg•m/s) = 5.00 kg•m/s
If v is the velocity of ball B after colliding with ball A, the total momentum after collision is
(2.00 kg) (-5.00 m/s) + (3.00 kg) v
Momentum is conserved, so these quantities are equal. Solve for v :
5.00 kg•m/s = (2.00 kg) (-5.0 m/s) + (3.00 kg) v
5.00 kg•m/s = -10.0 kg•m/s + (3.00 kg) v
15.0 kg•m/s = (3.00 kg) v
v = (15.0 kg•m/s) / (3.00 kg) = 5.00 m/s
