Final answer:
Statements A 'Gravity exists only on Earth' and E 'Gravity doesn't exist between Earth and the sun' are not true about gravity. Gravity is a universal force that exists everywhere in the universe and acts between any two objects with mass, including Earth and the Sun.
Explanation:
Statements A and E given in the question are not true about gravity. These options should be checked as they do not accurately describe the gravitational force as we understand it in physics.
A. Gravity exists only on Earth. This statement is incorrect because gravity is a universal force that acts between any two objects that have mass, no matter where they are in the universe. It's not a phenomenon exclusive to Earth.
E. Gravity doesn't exist between Earth and the sun. This statement is false because there is a significant gravitational force between Earth and the Sun, which is responsible for keeping Earth in orbit around the Sun.
On the other hand, statements B, C, and D are accurate descriptions of gravitational force:
B. Gravity exists between two objects that have mass. This statement is true as the gravitational force is indeed a result of the mass of objects.
C. Gravity is a force that pulls two objects together. This is the basic definition of gravity - it attracts two bodies towards each other.
D. Gravity exists in the whole universe. Gravity is a fundamental force that acts everywhere in the universe, not just on Earth or within our solar system.
which parts of an electric generator are connected
Answer:
https://brainly.com/question/10256321
Answer:
the armature and commutator
Explanation:
How are an engineer and a carpenter different
Answer:
engineers plan, carpenters do the manual work
Explanation:
engineers plan and sketch out the blueprint, while carpenters do the cutting, shaping and fastening of wood material, carpenters do the construction and repair
Answer:
The engineers do most of the planning and sketching of the plan, While a carpenter's job is to perform work entailing the cutting, shaping, and fastening of wood or material such as fiberboard that is treated as wood.
Explanation:
Carpenters perform the two principal jobs of construction and repair. Other then an engineer.
Betty made a simple electromagnet using just a battery and a wire. What could Betty do to increase the strength of her
electromagnet?
Answer:
Coil the wire around a nail.
Explanation:
If Betty wants to increase the strength of the electromagnet, she should coil the wire around an object that conducts electricity. Plastic, paper, and glass do not conduct electricity, so Betty should coil the wire around a nail.
Answer:
Coil the wire around a nail.
What is the magnitude of the electric field at a point 0.0050 m from a 0.0040
C charge?
Use E = kg and k = 9.00 x 10°N.m/c?
A. 1.4 x 1072 N
B. 2.8 1012 N
C. 1.1 x 1010 N
D. 7.2×10°N
Answer:
A. 1.4 * 10^(12) N/C
Explanation:
Parameters given:
Distance of charge from electric field, r = 0.0050 m
Charge, q = 0.0040 C
The electric field at a point, r, away from a charge, q, is given as:
E = (k * q) / r²
Where k = Coulomb's constant
E = (9 * 10^9 * 0.004) / (0.005²)
E = 1440 * 10^9 = 1.4 * 10^(12) N/C
The magnitude of the electric field at a point 0.005 m from the charge is 1.4 * 10^(12) N/C.
Answer:
Explanation:
Given that,
A charge Q = 0.004 C
We want to find the electric field at distance r = 0.005m
K = 9 × 10^9 Nm²/C²
Electric field at a point is given as
E = kQ / r²
E = 9 × 10^9 × 0.004 / 0.005²
E = 1.44 × 10¹² N/C
So, the magnitude of the electric field at 0.005m is 1.44 × 10¹² N/C.
Which of the following statements is true concerning mechanical waves and electromagnetic waves?
A
Both electromagnetic waves and mechanical waves require a medium to travel through.
B
Mechanical waves require a medium to travel through; electromagnetic waves do not.
C
Electromagnetic waves require a medium to travel through; mechanical waves do not.
D
Neither electromagnetic waves nor mechanical waves require a medium to travel through.
Answer:
B
Explanation:
Electromagnetic spectrum includes visible light which we see all the time reflecting off objects to give them colours, mechanical waves like sound require something to move in, its the reason why people say you can't scream in space because space is a giant vacuum. No not the kind you use to clean up the mess you made from breakfast. The kind that has no air. So sound can be heard on earth as it is not a vacuum, air moves freely and transfers sounds vibrations all around you to be absorbed by walls and other stuff in comes in contact with.
Extra information:
Sound travels further in water because the molecules are closer together meaning that transferring the energy is easier. This is how Blue wales can communicate from hundreds of miles away.
PLEASE ANSWER ASAPPP!!!!!
Ingrid hangs a black shirt on the clothesline to dry. After a few hours, she removes the black shirt from the clothesline and notices that it feels hot. What causes the black shirt to feel hot? How does molecular motion change when the black shirt gets hot?
EXPLAIN!!!
Answer:
The molecular motion starts to speed up when the black shirt becomes hot. because the light that absorbed from the black shirt gets converted to heat, and then absorbed by the shirt.
Explanation:
A cd player uses a ___ to convert info to an electrical signal
A. Neon light
B. Sodium vapor light
C. Laser
The pitch of a sound wave is related to wrich property?
A Wavelength
B. Amplitude
C. Volume
D . Frequency
Answer:
Frequency
Explanation:
A toy consists of two identical spheres connected by a string with negligible mass. The toy is thrown at an angle above the horizontal such that the string remains taut and both sphere are revolving counterclockwise in a vertical plane around the center of the string.
when the toy was released, the center of the string was moving with an initial speed of 15m/s at a 60 degree angle above the horizontal. What is the speed of the center of the string at the instant when the string reaches the top of its trajectory?
Answer:
7.5 m/s
Explanation:
The center of the string is a single point following projectile motion. At the top of its trajectory, the vertical component of the velocity is 0 m/s. In the horizontal direction, assuming negligible air resistance, the acceleration is 0 m/s², so the horizontal velocity is the same as the x component of the initial velocity. Therefore, the net speed of the center of the string is equal to the initial horizontal component of the velocity.
v = vₓ = 15 m/s cos 60° = 7.5 m/s
At the top of the trajectory, the speed of the center of the string is the same as the initial horizontal velocity, which is 7.5 m/s. This is because the vertical component of the velocity becomes zero while the horizontal component remains unchanged. Thus, the speed of the center of the string is 7.5 m/s.
To determine the speed of the center of the string at the top of its trajectory, we need to consider the initial conditions and the influence of gravity on the projectile motion.
The toy is thrown with an initial speed of 15 m/s at an angle of 60 degrees above the horizontal. We can break this down into horizontal and vertical components:
Initial horizontal velocity: v_x = v_0 cos(θ) = 15 m/s x cos(60°) = 7.5 m/sInitial vertical velocity: v_y = v_0 sin(θ) = 15 m/s x sin(60°) ≈ 13 m/sAt the top of the trajectory, the vertical component of the velocity becomes zero since the toy momentarily stops moving upwards and is about to start descending. The horizontal component, however, remains unchanged as there is no horizontal acceleration acting on it (ignoring air resistance).
Therefore, at the top of the trajectory, the speed of the center of the string is the horizontal component of the initial velocity: 7.5 m/s.
If you wanted to soundproof a room what insulator would you use
Answer:
foam but thats what i heard from other people
Explanation:
Answer:
If you want to make your insulation even more effective at blocking and absorbing noise that passes through walls or ceilings, you can add a few finishing touches before replacing the drywall. As I’ve explained in my article on the best wall soundproofing, you can add a layer of MLV over the insulation .
Explanation:
hii i need answers for this question. this is due today and i need it asap!! **will give brainlist**
Answer:
Explanation:
the bit the most kinetic energy is where it is going down
the bit with the most potential is the curb
The places with the most potential are the places at the highest points of the track (i.e., right behind where the coaster is situated, and towards the end of the loop). These places have the highest stored energy, that can be used.
The places with the most kinetic is where the low points of the track is at. In this case, it will be where the coaster is situated, and the latter half of the loop.
11. Which of the following forces is a contact force? *
A. Gravity
B. Friction
C. Magnetism
D. Electricity
Answer:
B
Explanation:
Gravity is an invisible force, and so is magnetism and electricity. Friction involves the rubbing of things together to create energy.
Answer:
B
Explanation:
Friction is the force that you feel whenever you try to drag an object across a surface. Like a box along the floor, or your hand across a counter-top. It requires two objects to be in direct contact with each other (don't worry about air friction AKA "drag").
The revolution period for Venus is___days.
121
225
156
212
(PLS ANSWER ASAP)
Answer:
225
Explanation:
The period of rotation of Venus is 243 Earth days, which is longer than the 225 days it takes the planet to orbit the sun. Moreover, the rotation is in the opposite direction from other planets in the solar system.
Answer:
225
Explanation:
What are the products in the photosynthesis equation?
A) 02 and energy
B) CO2 and 02
C) Glucose and 02
D) 02 and sunlight
Answer:
C
Explanation:
Which statement best summarizes Newton's law of action-reaction? *
Friction slows objects.
All forces act in pairs.
Force equals mass times acceleration.
O
An object in motion tends to stay in motion.
Answer:
The correct answer is the third
Force equals mass times acceleration
Explanation:
Newton's second law says that force equals mass times the acceleration of the body
F = m a
This is the most used way to solve problems
The correct answer is the third
Newton's third law states that forces always work in pairs, by action and reaction
Newton's first law states that an object per macerate with constant speed unless some force modifies this state.
Help me asap its due today
Answer:
[tex]3.54* 10^{22}[/tex] N
Explanation:
Using the formula you gave:
[tex]F_g = \frac{6.67*10^{-11}*2.0*10^{30}*5.97^{24} }{(1.5*10^{11})^2 }[/tex]
Calculate the mass in kg of an object that weighs 1,225 N on earth
To calculate the mass of an object that weighs 1,225 N on Earth, divide the weight by the acceleration due to gravity (9.80 m/s²). The mass is equal to 125 kg.
Explanation:To calculate the mass of an object that weighs 1,225 N on Earth, we can use the equation w = mg, where w is the weight, m is the mass, and g is the acceleration due to gravity (9.80 m/s² on Earth).
Rearranging the equation, we have m = w/g. Substituting the given values, m = 1,225 N / 9.80 m/s² = 125 kg.
Therefore, the mass of the object is 125 kg.
Learn more about weight and mass here:https://brainly.com/question/28122305
#SPJ12
What do we call the substances that react together (break/form chemical bonds) to form new substances?
A)reactants
B)products
C)none of the answers are correct
D)catalysts
Answer: A) reactants
Explanation:
Reactants are the substances that have chemical reactions when they are combined, whereas the product is what comes from the reactants’ chemical reactions.
Answer:
A)reactants
Explanation:
I think the correct answer is reactants because the substances that go into a chemical reaction are called reactants.
Sorry if it's wrong:(
find the unit of length,mass and time if the unit of force, velocity and energy are respectively 100N,10ms^1and 500J
Answer:
Mass = 5 unit
Length = 5 unit
Time = 0.5 unit
Explanation:
As we know that the units are as following
Force = 100 N
Velocity = 10 m/s
Energy = 500 J
i) For mass we know that
[tex]Force = mass \times \frac{velocity}{time}[/tex]
[tex]100 = mass \times \frac{10}{0.5}[/tex]
[tex]mass = 5 units[/tex]
ii) For length we know that
[tex]Force \times distance = energy/work[/tex]
[tex]100 (d) = 500[/tex]
[tex]Length = 5 units[/tex]
iii) for Time we know that
[tex]Power = \frac{Energy}{time}[/tex]
[tex]Force \times velocity = \frac{Energy}{time}[/tex]
[tex]time = \frac{500}{100\times 10}[/tex]
[tex]Time = 0.5 unit[/tex]
Explain Einstein's General Relativity Theory.
Answer:
The general theory of relativity (or general relativity for short) is a major building block of modern physics. It explains gravity based on the way space can 'curve', or, to put it more accurately, it associates the force of gravity with the changing geometry of space-time.
How does reverberation explain why your voice sounds different in a gym than it does in your living room
Reverberation is why your voice sounds different in a gym compared to a living room; hard surfaces in a gym increase reverberation time, creating echoes that can make sound seem mushy, while softer surfaces in a living room shorten it, providing clearer sound quality.
Reverberation explains why your voice sounds different in a gym compared to your living room due to the unique acoustic properties of different environments. In a gymnasium, the hard surfaces result in a longer reverberation time as sound waves bounce off and overlap each other, creating what is known as the comb effect. This often leads to mushy or muddled musical sounds and makes speech more difficult to understand due to the multiple echoes. Conversely, a living room typically has softer surfaces and objects that absorb sound, resulting in shorter reverberation times and a clearer, more intimate sound quality.
Reverberation provides us with clues about the size of a space and its material composition, affecting our perception of sound. For instance, large concert halls are designed with optimal reverberation times to enhance music, while spaces intended for speech, like lecture halls, aim for shorter reverberation to maintain speech clarity. Adjusting the level of reverberation can also add fullness to recorded voices or create the illusion of a different performance space.
19. Find the recoil velocity of a 65 kg ice hockey goalie who
catches a 0.15 kg hockey puck slapped at him at a
velocity of 50 m/s. Assume that the goalie is at rest
before catching the puck, and friction between the ice
and the puck-goalie system is negligible.
a. -0.12 m/s
b. O m/s
C. 0.12 m/s
d. 7.5 m/s
Answer:
c. 0.12 m/s
Explanation:
by using momentum formula [tex]v_2=\frac{m_1\times v_1}{m_1+m_2}[/tex]
we get
[tex]v_2=\frac{0.15\times 50}{0.15+65}=0.12[/tex]
The recoils velocity of the puck-goalie system would be 0.12 meters/second, therefore the correct answer is option C.
What is momentum?It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
As given in the problem we have to find the recoil velocity of a 65 kg ice hockey goalie who catches a 0.15 kg hockey puck slapped at him at a velocity of 50 m/s. Assume that the goalie is at rest before catching the puck, and friction between the ice and the puck-goalie system is negligible.
By using the conservation of the momentum,
The velocity of the recoil = 0.15*50 / (0.15+65)
=0.12 meters / second
Thus, the recoil velocity of a 65 kg ice hockey goalie would be 0.12 meters /second, therefore the correct answer is option C.
To learn more about momentum from here, refer to the link;
brainly.com/question/17662202
#SPJ2
what can you infer about fossil fuels from their name
Answer:
Fossil fuels come from the ground and are millions of years old
Explanation:
Fossil fuels come from the ground. i can infer and tell because most fossils are in the ground and also fossils are millions of years old. Fossil fuels are hydrocarbons, primarily coal, fuel oil or natural gas, and is from the remains of dead plants and animals. In dialogue, the term fossil fuel also includes hydrocarbon-containing natural resources that are not derived from animal or plant sources.
Sound waves are longitudinal waves. The height or intensity of the wave shows it's amplitude or the energy in the wave. In the diagram of a sound wave, the section labeled D shows the area of the sound wave with the
A) most amplitude and most compression.
B) most amplitude and most rarefaction.
C) least amplitude and most compression.
D) least amplitude and most rarefaction.
Answer:
most amplitude and compression .
Explanation:
can a magnet ever have a single pole
Answer:
no
In particle physics, a magnetic monopole is a hypothetical elementary particle that is an isolated magnet with only one magnetic pole (a north pole without a south pole or vice versa). A magnetic monopole would have a net "magnetic charge".
A spoonful of oil has poor solubility in water. Would a cup of oil dissolve into water?
Answer:
No
Explanation:
The density of the oil is different from the density of the water.
why do substances with free electrons make the best conductors.
Answer:
when electrons move around they create heat. the freer the molecules the more hear they can produce
A crane motor exerts 3,500.0 W to lift a load up 5 floors in 25.0 seconds. The crane did how much J of work.
Answer:
87,500 J
Explanation:
Power = energy / time
3,500.0 W = E / 25.0 s
E = 87,500 J
What charges must the particles have to create the electric field shown
Correct Option:
X shows positive while Y shows negative charges, create the electric field as shown.
Option: D
Explanation:
The idea of an electric field provides a way to define how starlight travels to enter our eyes across huge distances of empty space.The electric field is a quantity of vectors that is present at any point in space. The electric field at a region shows the force that, if put at that position, will operate upon a positive charge device.
The direction of the electric field points directly at a positive point charge, and straight at a negative point charge. The field direction is implemented to the force direction exert on a positive test charge. It is externally from a positive charge and radially in toward a negative point charge.
If it takes 520 joules of work to move an object 10 meters, what force was needed? A. 51 N B. 510 N C. 530 N D. 52 N
Answer:
52
Explanation:
W = F x s
520 = F x 10
F = 520 ÷ 10