Answer:
Gravitational force and magnetic force. The other forces on the list require contact (tension requires contact with the rope and friction requires the object to be in contact with the surface)
Explanation:
Answer:
gravitational force between the earth and an object and magnetic force between two magnets
Explanation:
gravitational force between the earth and an object and magnetic force between two magnets are forces that does not require contact between objects in order to exert a push or pull.
The earth and the object are never in contact with each other but there is a force of gravitation existing between them. There is force of attraction between the masses of the earth and the masses according to gravitational law are separated by a distance.
Force between two magnets may or maynot exert push or pull. They only attract when the poles of the magnets are unlike poles (different). There is force of repulsion between them if like poles of the magnet come together according to the law of magnetism. Magnets in magnetic field will always experience force even if at a distance from each other in the field hence the reason for the selected options
6.A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a velocity of 42m/s What is the approximate acceleration of the train during this time?
0.17 m/s2
0.20 m/s2
0.16 m/s2
0.14 m/s2
0.19 m/s2
0.16 m/s²
Explanation;From one of the equation of linear motion;
vf2 - vi2 = 2ax
Where;
vf = final speed after traveling a distance x at constant acceleration; vf = 42 m/s
vi = initial speed = 0 (starts from rest)
a = constant acceleration while traveling a distance x
x = distance traveled at constant acceleration; x = 5.6 km = 5600 m
Therefore;
a = vf2/(2x)
= 422/(2*5600) m/s²
= 0.1575 m/s²
≅ 0.16 m/s²
Answer:
O.16 m/s2
Explanation:
If temperature increases, what happens to pressure? Question 3 options: Pressure increases. Pressure decreases. Pressure stays the same.
Answer:
Pressure increases
Explanation:
Gay- Lussac's law gives the relationship between pressure and the temperature. There exists a direct relationship between temperature and pressure as per Gay- Lussac's law as :
At constant volume, [tex]pressure\propto temperature[/tex]
It is clear that pressure and temperature are directly proportional to each other. So, if temperature increases, pressure also increase. Hence, the correct option is (A) " Pressure increases ".
Answer: the pressure increases!
If temp. gets cold resistance in thermostat increases so voltage across it increases AND LED lights brighter. I understand everything except that for LED. It emits light when current passes through it, but if resistance increases how can current increase???
Normally, when something gets colder, its electrical resistance gets smaller. This is true of component-A in the drawing ... a simple resistor.
The component labeled 'B' has a strange and unusual symbol, and it's not a simple resistor. It's a "thermistor". The word "thermal" always has something to do with heat, and "thermistor" comes from "thermal resistor. These things can be manufactured either way ... using different materials, a thermistor can be manufactured so that its resistance goes UP, or goes DOWN, or doesn'tchange when it gets colder. I'm pretty sure that's what's going on here.
When this circuit gets colder, resistance-A gets smaller, but resistance-B either gets bigger OR doesn't change. Either way, the voltage across B increases. Since the LED is connected directly across B, the current through it depends on that voltage, so the LED gets more current, and becomes brighter, when A and B both get colder.
This circuit could actually be a very useful device. If you took out the LED and put a voltmeter in its place, then the reading on the voltmeter would tell you the temperature of wherever you put the two components A and B.
How does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed? A. the value of q is negative B. the value of q is positive C. the value of q remains constant D. the value of q decreases E. the value of q equals zero
The correct answer is :
B. the value of q is positive.
Hope this helps,
Davinia.
Answer : The correct option is, (B) the value of q is positive.
Explanation :
Photosynthesis : It is a chemical process or a reaction which takes place in the green plants or the living organisms. During this process, the carbon dioxide reacts with the water in the presence of sunlight to gives glucose and oxygen as a product.
The balanced chemical reaction will be,
[tex]6CO_2+6H_2O\overset{sunlight}\rightarrow C_6H_{12}O_6+6O_2[/tex]
As we know that the photosynthesis reaction can not takes place without sunlight. So, the photosynthesis reaction is an endothermic reaction in which the energy or heat are given to the system. That means the value of 'q' will be positive. If heat is released by the system then the value of 'q' is negative.
Hence, the correct option is, (B) the value of q is positive.
most earthquakes happen:
Final answer:
Most earthquakes occur along plate boundaries where stress is released through sudden slippages. The longer the interval between earthquakes, the greater the stress and energy released when the surface finally moves.
Explanation:
Most earthquakes occur along plate boundaries where tectonic plates interact. The motion of these plates builds up stress in the crust, which is released in sudden and violent slippages that generate earthquakes. The longer the interval between earthquakes, the greater the stress and the more energy released when the surface finally moves. For example, in California, the San Andreas Fault slips every 25 years or so, while the average interval between major earthquakes in the Los Angeles region is about 150 years.
In which direction does a bag at rest move when a force of 20 newtons is applied from the right? A. in the direction of the applied force B. in the direction opposite of the direction of the applied force C. perpendicular to the direction of the applied force D. in a circular motion
The correct answer is A. In the direction of applied force. This is because acceleration occurs n the direction of applied force according to Newtons second law of motion which states that the acceleration of a body is directly proportional to the applied force and takes place in the direction of force.
Answer:
A. in the direction of the applied force
Explanation:
As per newton's first law of motion we know that object will not change in its state of motion till some external force is applied on it
So here we can say that when force is applied on an stationary object then the stationary object will move in the direction of applied force so change in the state of motion from rest state to moving state will occur and the direction of motion must be in applied force direction
So correct answer will be
A. in the direction of the applied force
what is the simple average of these two velocities (0m/s, 0.4m/s)
The answer should be 0.2 :D
Look at the picture of the prism separating light. Which explains why a prism can separate sunlight into a rainbow of all the visible colors?
a. The prism reflects light of each wavelength at a different angle.
b. Light of each wavelength is refracted at a different angle.
c. The glass of a prism absorbs some colors and transmits others.
d. Light of each wavelength travels at a different speed through a vacuum.
I think the answer is c I’m not sure plz help.
It is either A or B i hope this helps
Consider the four spheres. As illustrated by the diagram, we would expect spheres A - C to be attracted to sphere D. Sphere D has the greatest gravitational force because as represented here, it
Has the most mass and density creating a gravitational field and pulling in the A and C with the lesser mass
Answer: the answer is A
Explanation:
A spring is 14cm long. Three masses are hung from it and then it is measured again. Now it is 19.5cm long. What force did the three masses provide? The spring constant for the spring is 30N/m
Answer:
1.65 N
Explanation:
The force applied on the spring is given by Hook's Law:
[tex]F=k \Delta x[/tex]
where
k = 30 N/m is the spring constant
[tex]\Delta x = 19.5 cm - 14 cm = 5.5 cm = 0.055 m[/tex] is the elongation of the spring relative to its initial position
Substituting the numbers into the equation, we find the force applied to the spring:
[tex]F=(30 N/m)(0.055 m)=1.65 N[/tex]
Between any object and surface, the coefficient of static friction is _____ the coefficient of kinetic friction.
equal to
less than
greater than
Answer
Greater than.
Static friction is the force that opposes motion between two objects that are not in motion. For the object to move one have to overcome the static friction. This force is usually greater than the force that exist between two surfaces that are in relative motion. This force is called kinetic friction.
For this reason the coefficient of static friction is greater that coefficient of kinetic friction.
Which statement best describes the superposition principle?
A.
If two in-phase waves arrive simultaneously at a point, their amplitudes add up.
B.
If two out-of-phase waves arrive simultaneously at a point, their amplitudes add up.
C.
If two in-phase waves arrive at a point one after another, their amplitudes add up.
D.
If two out-of-phase waves arrive at a point one after the other, their amplitudes adds up.
A. If two in-phase waves arrive simultaneously at a point, their amplitudes add up.
Explanation;According to the principle of superposition, when two waves of the same kind meet at a point in space, the resultant displacement at that point is the vector sum of the displacements that the two waves would separately produce at that point.Interference involves the superposing of two or more coherent waves to produce regions of maxima and minima in space, according to the principle of superposition. Interference may be constructive or destructive; Constructive interference occurs when two or more waves arrive at the screen in phase with each other, such that the amplitude of the resultant wave is the sum of the amplitude of the individual waves.Destructive interference occurs when two or more waves arrive out of phase with each other and resultant wave has minimum amplitude.Answer:
answer should be A.
Explanation:
Which is the goal of technology
TO bring joy and ease
It is the use of a (usually) mechanical means to create something physical that uses some scientific principle that will be used in war or for the betterment of man or both.
It is a machine that creates destruction or good or both that uses some sort of scientific basis of which it is an application.
Must all species reproduce in order for the species to survive?
A.
No; not all species reproduce.
B.
No; plants don't reproduce, and they survive.
C.
Yes; without reproduction, living organisms would get lonely.
D.
Yes; without reproduction, once the living organisms died, there would be no offspring to replace them
ANSWER:
the correct answer is D.Yes; without reproduction, once the living organisms died, there would be no offspring to replace them.
TIP: bc if a species dies and it doesnt reproduce that species will go extinct, and remember every specie plays a role in life (but they are some animals that dont and are just a threat to the world). so reproducing is the only way to keep their generation going!
~batmans wife dun dun dun...aka ~serenitybella
The correct answer is :
D. Yes; without reproduction, once the living organisms died, there would be no offspring to replace them.
If every species didn't reproduce they'd eventually all start dying and then there would be none left. (reproduce or reproducing basically means when a species gets pregnant and has more species. :D)
Hope this helps,
Davinia.
A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s2 to the right. What is the cart’s displacement during the first 6.0 s of this motion
Answer
66 m
Using the 2nd equation of linear motion, we can be able to solve the problem.
The equation states that;
S = ut + 1/2 at²
Where s ⇒ displacement,
u ⇒ initial velocity,
t ⇒ time and
a ⇒ is acceleration
∴ S = ut + 1/2 at²
= (5 × 6) + (1/2 × 2 × 6²)
= 30 + 36
= 66 m
3. The direction of the centripetal force acting on a ball on a string being spun in a circle around a person is
A. outward-seeking.
B. parallel to the person.
C. perpendicular to the person.
D. center-seeking.
D. center seeking. Good Luck
Answer: The correct answer is "center-seeking".
Explanation:
Centripetal force is the force which is required to keep the body in the circular motion. The direction of the centripetal force is towards center of the circle.
The expression for the centripetal force is as follows;
[tex]F= \frac{mv^{2} }{r}[/tex]
Here, r is the radius, v is the velocity and m is the mass of the object.
Without this force, the body cannot move in the circular motion. Then, it follows the straight line motion.
The direction of the centripetal force acting on a ball on a string being spun in a circle around a person is center-seeking.
Therefore, the correct option is (D).
An atom with five protons six neutrons and five electrons has an atomic mass of
An atom with five protons six neutrons and five electrons has an atomic mass of.
The element is boron with a atomic mass of 10.811 u
PLEASE HELP ASAP!!
A ______ and a ______ are examples of inclined planes.
First options.
A. Lever.
B. Wedge.
Second options.
A. Pulley
B. Screw.
A. Wedge
and
B.Screw
A screw is like an inclined plane wrapped around a pole or rod.
and a wedge looks kind of looks like this / and is inclined.
Hope this helps!
Please mark me brainliest! Thanks!
definition of liquid
a substance that is not solid
plz give me a brainliesttttt
According to the dictionary, the definition of liquid is, "a substance that flows freely but is of constant volume, having a consistency like that of water or oil."
Mass is a measure of the amount of matter in a substance. Weight, on the other hand, is a form of gravitational attraction, which is dependent upon mass and distance. Which of the following actions will cause the gravitational attraction between the Earth and an object to increase?
A.
increasing the mass of the object
B.
decreasing the mass of the Earth
C.
increasing the distance between the Earth and the object
D.
decreasing the distance between the object and the Sun
From this particular list of choices, only A. increasing the mass of the object can increase the gravitational attraction between the object and the Earth.
Choices B and C have exactly the opposite effect, and choice-D has no effect at all.
This is all just a complicated, technical way of saying that if you eat a big steak plus a few shakes, your mass increases, and you WILL gain weight.
Answer:
A
Explanation:
got it right on study island
To move a heavy couch across a carpeted floor what could be used to decrease the frictional force
Use a piece of cardboard
Put a lubricant between the surface of the object and the floor. use round objects, like pencils, to decrease the friction and push the refrigerator over the pencils
You use a very sensitive instrument to measure the speed of sound in your front yard in December. You repeat the test in August when the temperature is 10°C (50°F) warmer. In August, the speed of sound will be:
A: slower
B: the same
C: faster
than in December.
The speed of sound varies depending on the medium through which the sound waves travel. In addition, it varies with changes in the temperature of the medium. This is because an increase in temperature means that the frequency of interactions between the particles that transport the vibration increases, hence this increase in activity increases the speed. That is why the speed of sound in a gas is not constant, but depends on the temperature.
So, if we want the speed of sound in a gas to increase, the temperature of that gas must increase, as well.
For example, the higher the air temperature, the greater the velocity of propagation. Experiments have shown that the speed of sound in air increases [tex]0.6m/s[/tex] for every [tex]1\°C[/tex] increase in temperature.
Therefore:
The speed of sound will be faster than in DecemberAnswer:
Faster
Explanation:
Which is an advantage of using space observatories for space exploration?
It allows scientists to avoid the effects of light pollution.
Answer:
The advantage is to avoid the effects of light pollution.
Explanation:
There are several reasons why space observation is desirable in order to avoid problems that terrestrial observatories have. An example of this is that the space observatory does not suffer from the interference of city lights, avoiding light pollution. In addition, thermal turbulence (present in the atmosphere) also does not alter the telescope image. The terrestrial atmosphere, having a spherical shape, acts as a lens that distorts images (a fact known as optical aberration), so the resolution of terrestrial images has a significant reduction. The atmosphere of our planet also absorbs an important portion of the electromagnetic spectrum (infrared and ultraviolet rays, for example), so some observations are virtually impossible to make.
I'm hungry as hell right now. How much time does someone need to die from starving?
About 2 months depends on the person
a tool that uses lenses to focus light and
create useful images
the answer your looking for is Optical instrument.
-- microscope
-- eyeglasses
-- telescope (refracting type)
What property of water allows it to rise up in a plant
The property of water that allows it to rise up in a plant is its cohesion and adhesion properties
What is capillarity?Capillarity, also known as capillary action, is the ability of a liquid to flow in narrow spaces, such as thin tubes or porous materials, due to the combined effects of adhesion, cohesion, and surface tension. This phenomenon occurs because the adhesive forces between the liquid and the solid surfaces are stronger than the cohesive forces between the liquid molecules.
Cohesion refers to the attraction between water molecules, which allows them to stick together, while adhesion refers to the attraction between water molecules and the walls of the xylem vessels in the plant.
These two properties work together to create a continuous column of water from the roots to the leaves of the plant, allowing it to transport water and nutrients to all parts of the plant.
This process is known as capillary action. Additionally, water's ability to evaporate through tiny openings in the leaves, called stomata, creates a pulling force, known as transpiration, that helps draw more water up the plant.
Learn more about capillary action at:
https://brainly.com/question/3327291
#SPJ1
Choose all the answers that apply. The sun: -is the largest star in our solar system -is the largest star in our galaxy
- is made mostly of hydrogen and helium
-will eventually run out of fuel and die
-creates energy through nuclear reactions
-is made mostly of hydrogen and helium.
-will eventually run out of fuel and die.
-creates energy through nuclear reactions
Answer:
The sun:
-is the largest star in our solar system
- is made mostly of hydrogen and helium
-will eventually run out of fuel and die
-creates energy through nuclear reactions
Explanation:
The sun an average mass and sized star composed of hydrogen and helium gas. It generates energy in its core by nuclear fusion reaction. It is the only star in the solar system. Once all the fuel is run out, the nuclear fusion reaction would stop and the sun would die. There are billions of stars in our milky way galaxy and sun is not the largest of them.
A ball is thrown straight up into the air with a speed of 10 m/s . If the ball has a mass of 0.3 kg how high does the ball go ?
= 5.102 m
Explanation;The total energy, i.e. sum of kinetic and potential energy, is constant.
That is; E = KE + PE
Initially, PE = 0 and KE = 1/2 mv^2
At maximum height, velocity=0, thus, KE = 0 and PE = mgh
Since, total energy is constant (KE converts to PE when the ball is rising).
Therefore, KE = PE
or, 1/2 mv^2 = mgh
or, h = v^2 /2g
= 10^2 / (2x9.8)
= 5.102 m
Answer:
5.1
Explanation:
apex
You take a conductive wire and make loops in it, you create a _________.
A.) CIrcuit Breaker
B.) Rheostat
C.) Solenoid
D.) Fuse
When you take a long piece of wire, form it into a coil of several loops, and run a current through it, you get a magnetic field that runs straight along the axis of the coil.
This arrangement of a conductor and the current through it is called a "solenoid". (C)
A solenoid is a form of coil that produces a magnetic field when the electric current is passed through it. A solenoid is created when a conductive wire is used to make a loop.
what is a solenoid?A coil of wire that carries an electric current is a solenoid. A solenoid is an electromagnet formed by a helical coil of wire. Which generates a magnetic field when an electric current is passed through the coil .
What is a conductive wire?In material or wire conductance is dependent on the number of mobile electrons present in the material or wire.
A conductive wire is a type of wire which has a sufficient amount of mobile electrons which are useful for producing conductance in the material.
examplessilver, copper, iron, etc.
To learn more about the solenoid refer to the link ;
brainly.com/question/16015159
Which of the is a trait in humans that is determined by multiple alleles
The best characterized example of multiple alleles in humans is the ABO blood groups, discussed in the Non-Mendelian Inheritance concept. Other human traits determined by multiple alleles would be hair color, hair texture, eye color, built, physical structures, etc.