True. There IS gravity in space. Tons of it.
What happens to the resistance of a wire as its length increases? A. The resistance decreases. B. The resistance is not affected by a change in wire length. C. The resistance alternates between high and low values. D. The resistance increases.
Answer:
D. The resistance increases.
Explanation:
Resistance of a wire is R = ρL/A, where ρ is the resistivity of the wire, L is the length, and A is the cross sectional area.
As L increases, R increases.
A 41 turn rectangular coil of dimensions 5.00 cm ✕ 10.0 cm is allowed to fall from a position where B = 0 to a new position where B = 0.520 T and the magnetic field is directed perpendicular to the plane of the coil. Calculate the magnitude of the average emf that is induced in the coil if the displacement occurs in 0.330 s.
Explanation:
We have,
Number of turns in a coil is 41
Dimensions of a rectangular coil is 5 cm by 10 cm
Initial magnetic field is 0 and new field is 0.52 T. The magnetic field is directed perpendicular to the plane of the coil.
It is required to find the magnitude of the average emf that is induced in the coil if the displacement occurs in 0.330 s. According to Faraday's law,
[tex]E=\dfrac{-d\phi}{dt}[/tex]
[tex]\phi[/tex] = magnetic flux
[tex]E=\dfrac{-d(NBA)}{dt}\\\\E=NA\dfrac{-(B_f-B_i)}{dt}\\\\E=41\times 0.005\times \dfrac{(0.52)}{0.33}\\E=0.32\ V[/tex]
So, the magnitude of induced emf is 0.32 V.
If a person has a mass of 60 kg and a velocity of 2 m/s, what is the
magnitude of his momentum?
A. 1,176 kg-m/s
B. 58 kg-m/s
C. 30 kg-m/s
D. 120 kg-m/s
Answer:
120
Explanation:
P = MV
so 60 x 2 will give you a momentum of 120
Derive the third equation of motion v2=u2+2as
[tex]let \: us \: assume \: a \: body \: moving \: with \: \\ an \: initial \: velocity \: u \: . \: let \: its \: final \\ velocity \: be \: v \: after \: a \: time \: t \: and \: the \\ distance \: travelled \: by \: the \: body \: be \: s . \\ we \: already \: have \\ v = u + at.......(i) \\ s = \frac{u + v}{2} \times t..........(ii) \\ putting \: the \: value \: of \: t \: from \: (i) \: in \\ the \: equation \: (ii) \\ (v = u + at \\ or \: at = v - u \\ or \: t = \frac{v - u}{a} \\ now\\ s = \frac{u + v}{2} \times \frac{v - u}{a} \\ or \: s = \frac{ {v}^{2} - {u}^{2} }{2a} \\ or \: 2as = {v}^{2} - {u}^{2} \\ {v}^{2} = {u}^{2} + 2as \\ hope \: it \: helps \\ good \: luck \: on \: your \: assignment[/tex]
What is the resultant acceleration?
A. The scalar that joins all the points along the path
B. The resultant displacement divided by time
C. The sum of all the acceleration vectors
D. The average of all the acceleration vectors
Answer: C.
The sum of all the acceleration vectors
Explanation: The word resultant means the sum of two or more vectors.
Since acceleration is a vector quantity,
The resultant acceleration will be the sum of all the acceleration vectors. Where there are two or more acceleration to be considered on an object in a system.
A pet hamster runs across the floor at 5.6 m/s for 3.9 s toward the door. How far
does he get?
Answer:
Travelled 21.84m
Explanation:
5.6 metres a second, 3.9 seconds.
5.6×3.9=21.84
Scientific knowledge
A.
was modified regularly early in human history, but it can no longer be modified.
B.
must be modified by popular vote from the general public.
C.
cannot be modified, even if new information challenges prevailing theories.
D.
can be modified as new information challenges prevailing theories.
Answer:
D
Explanation:
As we progress and learn more, scientists make new discoveries that can contradict earlier discoveries, and since are technology is better today we are able to discover a lot more to add to or change our previous theories.
Answer:
The answer is D. i got this off of study island
Explanation:
Hope this helps!
Why does the winds move? What makes it move,?
Explanation:
The wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds. On a rotating planet, air will also be deflected by the Coriolis effect, except exactly on the equator.
HOPE THIS HELP YOU !!! :)))The wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds. On a rotating planet, air will also be deflected by the Coriolis effect, except exactly on the equator.
Why does the wind move?
he wind blows because of differences in air pressure. ... Instead, the wind blows anti-clockwise around the low pressure area in the Northern Hemisphere and clockwise in the Southern Hemisphere. This is the effect of the earth's rotation, which produces a force, called Coriolis, that deflects the wind from its path.
Why does air move to one place or another?
Air moves because the sun generates heat on the earth, this causes hot air, hot air rises creating wind, the air which is made up of 02 C02 and many other gases is carried by wind. air moves from place to place due to the different temperature and pressure conditions on the earth
39. Three 12 a resistors are connected in parallel and then connected to a 6.0 V battery. Find
the resulting current. Show your work. This is a two part question.
40. The devices and outlets in each circuit in a household are wired in parallel. The main
reason for this is
a. Plugging in more devices increases the total resistance on the circuit
b. Plugging in more devices decreases the total resistance on the circuit.
c. Unplugging a device does not affect the other devices on the circuit.
d. Connecting the devices in parallel is safer than if they were in series.
Answer:
39.) Current = 1.5 A
40.) B
Explanation:
Given that three 12 Ohms resistors are connected in parallel.
The equivalent resistance R will be
1/R = 1/R1 + 1/R2 + 1/R3
Substitute the values into the formula
1/R = 1/12 + 1/12 + 1/12
1/R = 3/12
Find the reciprocal of both sides
R = 12/3
R = 4 Ohms
From Ohm's law,
V = IR
Where V = 6v
Substitute V and the R into the formula and make current I the subject of formula
6 = I × 4
I = 6/4
I = 1.5 A
Therefore, the resulting current is 1.5 Ampere.
40.) If the devices and outlets in each circuit in a household are wired in parallel, The main reason for this is
Plugging in more devices decreases the total resistance on the circuit.
Because, the sum of resistance of resistors in parallel is less than the least resistance of a resistor is the circuit. Also, they will all share the same amount of voltage because there is no voltage drop.
A batter hits a fly ball into the outfield. The
force is responsible for the ball falling to the ground.
Select the correct answer.
Which situation may cause delayed rigor mortis?
A.
The victim was found in the summer during a heat wave.
B.
The victim died a violent death.
C.
The victim was sleeping at the time of death.
OD. The victim died of cancer.
Reset
Next
Answer: the answer is C
Explanation:
The famous scientist Galileo Galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. By changing the slope, he could study how the speed at which the ball rolled was affected.
What was one thing Galileo would have needed to control himself to make sure his experiment gave him useful information?
A. the speed of the ball
B. the slope of the plane
C. the pull of Earth's gravity
D. the material the ball was made of
which has a greater mechanical advantage. a doorknob or screwdriver?
Answer:
screwdriver should be the awnser is what I think
PLEASE HELP ASAP URGENT!!!!!
Which statement is true of AC current?
A.
It uses a battery as a power source.
B.
It can easily be transformed from high voltages to low voltages.
C.
It is typically low voltage.
D.
the electrons are moving in one direction
E.
It was the first type of electric current invented.
Answer:
B
i am not fully sure but i believe its the most accurate its either A or B
Answer:
b
Explanation:
plato
What is the time period of vibration?
Answer:
A time period is denoted by 'T' . It is the time to complete one cycle of vibration. As the frequency of a wave increases, the time period of the wave decreases. The unit for time period is 'seconds
HOPE IT HELPS :)
PLEASE MARK IT THE BRAINLIEST!
Hypothesis:
Part A
If we split a laser beam by using a diffraction grating slide, then we can
verify the _____________ by applying the formula λ = ds/l.
2) Part B If we split light into its individual wavelengths using a diffraction grating,
then we can determine the _____________ by multiplying the spacing of the
gradient lines (d) times the distance to the central maxima of the color band (s)
divided by the length distance from the grating slide to the screen (l).
Answer:
1.) Wavelength
2.) Number of fringes
Explanation:
1.) If we split a laser beam by using a diffraction grating slide, then we can
verify the wavelength by applying the formula λ = ds/l.
2) If we split light into its individual wavelengths using a diffraction grating,
then we can determine the number of fringes by multiplying the spacing of the gradient lines (d) times the distance to the central maxima of the color band (s) divided by the length distance from the grating slide to the screen (l).
Which effect is created when two sound waves that are close in pitch
interact?
O A. Echoes
O B. Loudness
C. Beats
O D. Intensity
Answer:
C. Beats
Explanation:
When waves are interfering with each other, the sound is louder in some places and softer in others. As a result, we hear pulses or beats in the sound.
Answer:
beats
Explanation:
got it right
Pedro is planning to model how changes in weather affect evaporation from
lakes. For his first experiment, he wants to test how humidity affects the
evaporation rate. He places one beaker with 300 mL of water in a dry area,
and he places another beaker with 300 mL of water near a humidifier.
What is the dependent variable in Pedro's experiment?
A. Evaporation rate
B. Temperature
c. Humidity
D. Volume of water
Answer:
Evaporation rate is the dependent variable in Pedro's experiment
Explanation:
it is the variable that is being measured and is expected to change in response to changes in humidity. The independent variable is humidity, which is being manipulated by placing one beaker near a humidifier and the other in a dry area. Temperature and volume of water are not being directly manipulated in this experiment and are therefore not the dependent variable.
Electrical Force is possible because of
Answer:
Electrical forces result from mutual interactions between two charges. ... The direction of each of these three forces can be determined by applying the basic rules of charge interaction: oppositely charged objects attract and like-charged objects repel
Explanation:
Which model below correctly represents an object with a correct pair of magnetic domains?
Answer: The term magnetism comes from the region of Magnesia, a city in Western Turkey, where Greeks found lodestones, which attracted iron pieces across the space. It is also observed that, magnets attract as well as repel. We can explain this dual nature of magnetic force by proposing that each magnet has two poles, north pole (N) and south pole (S). You will observe two things during the activities:
1) When two magnets are brought near each other, like poles repel; opposite poles attract.
2) When a magnet is brought near a piece of iron, the iron also gets attracted to the magnet, and it acquires the same ability to attract other pieces of iron.
hope this helps u stay safe
Some very hot stars appear bluish when viewed by a telescope. This is because they _____ more blue light than stars like the Sun. A. emit B. reflect C. absorb D. transmit
Answer:
A. they emit more blue light than stars like the Sun
If you add a small amount of hydrochloric acid to 4 liters of water, you would create a _____ solution.
A.) concentrated
B.) weak
C.) dilute
D.) basic
Answer:
The answer is D.
Explanation:
An example of a weak base is ammonia. It does not contain hydroxide ions, but it reacts with water to produce ammonium ions and hydroxide ions. The position of equilibrium varies from base to base when a weak base reacts with water. The further to the left it is, the weaker the base.
Answer:
The correct answer is C.) dilute
Fill in the blanks to complete each statement about weathering. Weathering is the breakdown of rocks into smaller particles called-------------- . ------------------ weathering is when rocks are physically broken into smaller pieces, but the minerals in the rock remain the same. When a rock is broken down in a way that changes the mineral composition, it is called----------------- weathering.
Answer:
sedimentary rocks and sedimentary
i am not 100% sure that this is the correct answer but it is an educated guess
Answer:
Sediment
Mechanical
Chemical
Explanation:
A dead organism is the same as a nonliving thing in science.
Fact:
Evidence:
Answer:
Myth: A dead organism is the same as a nonliving thing in science. ... Things that are dead once did have the characteristics of life, but when they die, they lose some of the characteristics. That is why dead and non-living are NOT the same thing.
Answer:
Non-living thing is never alive.
Dead thing was once alive.
Living things can breathe, grow, reproduce, detect and respond to the changes in the environment, excrete, use the energy from the environment. E.g., Animals
Non-living things don't exhibit these characteristics. E.g., Soil, air
Let's take an example of living things, say lion. When a lion dies, we never say,”Lion has become a non living thing now”. But we say,” Lion is dead”. Death can only happen to living things.
Lion is dead now. But it was once alive.
But soil is never alive. Never dead too!
Hope this helps!
Have a great day!
Explanation:
Starting with the Sun, trace the path of energy that occurs in order for you to lift a
book off the ground, describing each energy transformation.
plz leave an explanation thx c:
Answer: see the answer in the explanation.
Explanation:
The energy produce by the sun is called solar energy which eventually produces light energy. The light will make you to see the book and insinuate mechanical energy within you. In order for you to lift abook off the ground the energy involved is mechanical energy which involves potential energy to kinetic energy transformation
Which of the following statements is good advice to prevent becoming overly emotional?
A.
There is no way to prevent becoming overly emotional.
B.
You should hang around with people that make you angry as often as possible so that you get used to having to control your emotions.
C.
Get enough sleep every night.
D.
Eating unhealthy, good tasting food will make you happy so that you don
Answer:
c
Explanation:
Try to remember that sleep deprivation or the lack of sleep, messes with the amygdala in the brain - this is the part of the brain that controls some of our emotions. If you mess with the amygdala then it messes with you - it will cause you to be more fight than flight - it can make you hypersensitive to stuff that you normally could use your coping skills to conquer!
Answer:
c
Explanation:
1. why does the sun have the greatest amount of gravity in our solar system?
Answer:
it is the biggest object that is the closest to us
Explanation:
What kind of friction exists between solid objects moving in water?
static friction
sliding friction
rolling friction
drag
Answer:
Drag friction.
Explanation:
If you have a solid object, go through air, it experiences drag because the air molecules push back a tiny bit. This drag is enhanced because in water, the molecules are more resistant than air, that's why if you try to run in knee deep water, you experience much more drag than when you are running with your legs out of the water.
Place the descriptions in the correct categories.
rift valleys
At Convergent Boundaries
At Divergent Boundaries
plates pulling apart
magma breaks through crust
subduction
volcanic mountains
island arc
magma flows from cracks
mid-ocean ridges
Answer:
At Convergent Boundaries:
Subduction
Island arcs
Volcanic mountains
At Divergent Boundaries:
Mid-ocean ridges
Rift valleys
Plates pulling apart
Magma breaks through crust
Magma flows from cracks
Explanation:
A convergent plate boundary is a location where two tectonic plates are moving toward each other, often causing one plate to slide below the other (in a process known as subduction). The collision of tectonic plates can result in earthquakes, volcanoes, the formation of mountains, and other geological events.
A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth's mantle to the surface, solidifying to create new oceanic crust.
Divergent boundaries occur in the rifts of the oceanic ridge system, including the Mid-Atlantic Ridge and the East Pacific Rise, and in the continental lithosphere by rift valleys such as the famous East African Great Rift Valley.
Answer:
At Convergent Boundaries
subduction
island arc
volcanic mountains
magma breaks through crust
At Divergent Boundaries
mid-ocean ridges
rift valleys
plates pulling apart
magma flows from cracks
Explanation:
A ray moving through glass (n = 1.51) passes into acetone (n = 1.36). How much does its velocity change?
Answer:
Change in velocity = 0.219 × 10⁸ m/s (Approx)
Explanation:
Given:
Ray moving through glass (n1) = 1.51
Ray moving through (n2) = 1.36
Find:
Change in velocity.
Computation:
Speed of light = 3 × 10⁸
Change in velocity = [(c/n2) - (c/n1)]
Change in velocity = [(c/n1) - (c/n1)]
Change in velocity = 3 × 10⁸[(1/1.36) - (1/1.51)]
Change in velocity = 3 × 10⁸[0.7352-0.6622]
Change in velocity = 3 × 10⁸[0.073]
Change in velocity = 0.219 × 10⁸ m/s (Approx)