Answer:
8AExplanation:
According to ohm's law, V = IR where;
V is the supply voltage (in volts)
I is the current supplied (in amperes)
R is the resistance (in ohms)
Initially, I = 2A, hence V = 2*R;
V = 2R .................... 1
If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, then the new resistance will be expressed as R₂ = 1/4 R and V₂ = V
Substituting the new conditions into the ohms law formula, we will have;
V₂ = I₂R₂
I₂ is the resulting new current
V = I₂ (1/4 R)
V = I₂ * R/4
V = I₂R/4 ...... 2
Substituting equation 1 into 2 we will have;
2R = I₂R/4
2 = I₂/4
cross multiply
I₂ = 4*2
I₂ = 8A
Hence the resulting new current is 8A
Allison wants to calculate the denisty of a rock. To do this, what tools will she need to measure
the mass and volume of the rock?
Answer:
Explanation:
Allison can measure the mass of the rock by using a scale. An electronic beam balance will be able to give her the mass of the rock to a fairly accurate degree.
To go about measuring the volume of the rock, an indirect approach has to be adopted since the rock is not regular in shape. Allison would have to adopt a principle that explains that the volume a solid body displaces when immersed in a pool of liquid, is directly equal to the volume of the solid itself.
This means that if the stone is placed in a beaker of water containing an already measured volume of water, the increase in the volume of the water when the stone is immersed is equivalent to the volume of the stone.
help pleaseeeee!! What is something that you would like to see a physicist develop in the future?
Teleportation (artificial or natural over wormhole).
URGENTE ¿Cuál de los siguientes términos corresponde al concepto presión? * A. Es la fuerza perpendicular que ejerce un cuerpo sobre un volumen. B. Es la fuerza que ejerce perpendicularmente sobre la masa de un cuerpo. C. Es el área que se ejerce en forma perpendicular sobre un cuerpo para generar fuerza. D. Es la fuerza que un cuerpo ejerce perpendicularmente sobre el área en la que actúa.
Answer:
Respuesta correcta, opción D: Es la fuerza que un cuerpo ejerce perpendicularmente sobre el área en la que actúa.
Explanation:
La definición de presión es la fuerza que un cuerpo ejerce en dirección perpendicular sobre el área en la que actúa.
Cuando se aplica una fuerza sobre la superficie de un cuerpo, la presión es la siguiente:
[tex] P = \frac{F}{A} [/tex]
En donde:
F es la fuerza aplicada.
A es el área del cuerpo.
Por lo tanto la opción correcta es la D: es la fuerza que un cuerpo ejerce perpendicularmente sobre el área en la que actúa.
Espero que se sea de utilidad!
why is breaking down a compoud into its elements considered a chemical change
Answer:
Chemical change is characterized by the formation of new substances, and the making and breaking of strong chemical bonds.
Explanation:Decomposition of a compound into its elemental constituents certainly falls under this umbrella
A pie is cooked in an oven at 200 °C. The aluminium film that covered the pie can be touched soon after it is removed while the pie is still dangerously hot, explain this.
Answer:
A pie is cooked in an oven at 200 °C. The aluminium film that covered the pie can be touched soon after it is removed while the pie is still dangerously hot, explain this.
Explanation:
briefly discuss the phenomenon of childhood maltreatment in the context of five different psychological perspectives
Answer:
Child maltreatment or child abuse is a phenomenon of sexual, physical, and/or psychological abuse of children.
Five different psychological perspectives of childhood maltreatment are as follows:
Poverty is one of the biggest cause of childhood maltreatment that impact once psychological health.Child do not get proper care from their parents.Childrens are emotionally weak and anything negative thought can depress them.Lack of communication sometimes make children underconfident.Social descrimination on the basis of race and gender can impact a child psychological balance.
108.756 divided by 9.35
Answer:
11.63
Explanation:
A newly discovered planet has a radius twice as large as earth's and a mass five times as large. What is the free-fall acceleration on its surface?
Answer:
free-fall acceleration = 12.25 m/s²
Explanation:
Formula for free fall acceleration is given by the gravity equation;
g = Gm/r²
Where;
M is mass of the Earth
r is radius of the Earth
G is the gravitational constant
Now, that equation applies to the earth.
For this new planet, we are told that the mass = 5 × mass of earth
And radius = 2 × radius of earth.
Thus, free fall acceleration for this planet is;
g_p = G(5m)/(2r)²
g_p = (5/4)(Gm/r²)
Gravitational constant has a value of 6.674 × 10^(−11) N.m²/kg²
Mass of the earth = 5.972 × 10^(24) kg
Radius of the earth = 6378 km = 6378000
Thus;
g_p = (5/4)(6.674 × 10^(−11) × 5.972 × 10^(24))/(6378000²) = 12.25 m/s²
Draw a diagram to show the life-cycle of a
silk moth.
[tex] \huge{ \underline{ \underline{ \green{ \bf{Answer:}}}}}[/tex]
The female silk moth lays eggs. When the eggs hatch a tiny Caterpillar comes out, This is the Silkworm or Larva. The silkworm feeds on leaves and grass. When it is ready to enter the next stage in its lifecycle, it first weaves a net around itself. It then secrets a fibre made up of proteins which hardens on exposure to air. This is the Silk fibre. It covers itself completely with this fibre to form a cocoon at this stage the Larva is called Pupa. The Pupa grows and changes inside the cocoon. A few weeks later the cocoon opens and an adult moth come out.
The Silk yarn is obtained from the cocoon of the silkworm. The breeding and management of silkworms is known as Sericulture.━━━━━━━━━━━━━━━━━━━━
when you turn on music on your phone, what energy transformation takes place?
Answer:
the Battery of the phone contains chemical energy which transfers Light and Sound energies.
Can someone Please Help!!
Answer:
If the ball is accelerating down through the air with no horizontal motion, the net forces acting on the ball must follow: C. The gravitational force is greater than the drag.
Explanation:
This is because the gravitational force is directed downward and the drag force opposes the direction of motion (therefore the drag force is directed upwards). Since the ball is accelerating downwards, the gravitational force must be greater than the drag force in order to create this acceleration.
We know that the other options are incorrect because if the net force on the ball was directed upwards, the ball would be accelerating upwards. If the net force on the ball was zero, the ball would not be accelerating at all. If the drag was greater than the gravitational force, then the ball would be accelerating upwards as well.
Hope this helps!
the comparison between gravity and air resistance
Answer:
Objects are affected by gravity the same, but air resistance can affect the speed of an object's descent. An object with more surface area will have more air resistance.
Explanation:
The more surface area the object has to get through the air particles, the slower it will take to fall. ... In space, there is no air
A quarterback pedals 3.3 meters southward and then 5.7 meters northward for this motion what is the distance moved?
Answer:9
Explanation:
we are adding the numbers given to find the total.
Vanessa runs on the soccer field 20 meters North, then makes a cut to the right going East for 3 meters. What is Vanessa’s displacement from her original spot?
Answer:
20.2 m
Explanation:
Given that Vanessa runs on the soccer field 20 meters North, then makes a cut to the right going East for 3 meters. What is Vanessa’s displacement from her original spot?
The Vanessa displacement can be calculated by using pythagorean theorem.
Displacement = sqrt( 20^2 + 3^2 )
Displacement = sqrt( 400 + 9 )
Displacement = sqrt( 409)
Displacement = 20.2 m
illustrate a body of mass 5.0kg pulled by horizontal force F . if the body accelerates 2.0ms² and experience a frictional force of 5N
a. calculate the netforce
b. magnitude of force
c. coefficient of kinetic friction
Explanation:
a. Net force is mass times acceleration (Newton's second law).
∑F = ma
∑F = (5.0 kg) (2.0 m/s²)
∑F = 10 N
b. The net force is the sum of the individual forces.
10 N = F − 5 N
F = 15 N
c. Friction force here is mgμ.
mgμ = 5 N
(5.0 kg) (10 m/s) μ = 5 N
μ = 0.1
The radius of the planet Saturn is 5.85 ✕ 107 m, and its mass is 5.68 ✕ 1026 kg. (a) Find the density of Saturn (its mass divided by its volume) in grams per cubic centimeter. (The volume of a sphere is given by 4/3 πr3.) g/cm3 (b) Find the surface area of Saturn in square meters. (The surface area of a sphere is given by 4πr2.)
Answer:
1.) 0.68 g/cm^3
2.) 4.3 × 10^16 m^2
Explanation:
Given that the radius of the planet Saturn is 5.85 ✕ 107 m, and its mass is 5.68 ✕ 1026 kg.
Where (The volume of a sphere is given by 4/3 πr3.)
Substitutes r into the parameters
V = 4/3π × ( 5.85 × 10^7)^3
V = 8.39 × 10^23 m^3
Convert cubic meters to cubic centimeters by multiplying the result by 1000000
V = 8.39 × 10^29 cm^3
The mass in gram will be
5.68 ✕ 10^26 × 1000 = 5.68 × 10^29g
Density = mass/ volume
Substitute all the parameters into the formula
Density = (5.68 × 10^29) / (8.39 × 10^29)
Density = 0.68 g/cm^3
2.) The surface area of a sphere is given by 4πr^2.
Substitute r into the formula
Surface area = 4π × (5.85 ✕ 10^7) ^2
Surface area = 4.3 × 10^16 m^2
The driver of a car makes an emergency stop by slamming on the car's brakes and skidding to a stop. How far would the car have skidded if it had been traveling twice as fast
Answer:
4 times as far
Explanation:
It is kinda hard but this equation should explain x−x0=v0v0a0−a0v202a20=v202a0 so 4 times (and if you would have been going 3 times as fast it would be 9 times as far...)
Answer:
The car would have skidded 4 times as far if it had been traveling twice as fast.
C
A downhill skier was able to move 560 meters in 25 seconds. What is the skie
answer to the nearest tenth of a meter per second.)
The skier's average speed is
m/s
Explanation:
Speed = distance / time
v = 560 m / 25 s
v = 22.4 m/s
Answer:
22.4
Explanation:
Hope this helps
S= 560m÷25s=22.4m/s
What should students do before inserting the plug of an electrical device into a socket?
Explanation:
They should make sure the area is dry
A mouse ran 100 centimeters in
20 seconds. What was his speed?
A. 5 cm/s
B. 0.2 m/s
C. 2000 m/s
D. 120 m/s
Explanation:
Speed = 100/20 = 5cm/s
Option A is the correct answer
Speed = Distance/Time, therefore the speed of the mouse is 5 cm/s. Hence, option A is correct.
What is speed?The pace at which a distance changes over time is referred to as speed. It has a dimension of time distance. As a result, the fundamental unit of time and the basic unit of distance are combined to form the SI unit of speed. Thus, the meter per second (m/s) is the SI unit of speed.
You can determine an object's speed if you know how far it moves in a given amount of time. For instance, an automobile is moving at a pace of 70 miles per hour if it covers 70 miles in an hour (miles per hour).
If you know how far something has traveled and how long it took to get there, you can calculate its average speed. Speed is calculated as speed = distance/time. Hence, option A is correct.
Learn more about speed, here:
https://brainly.com/question/6280317
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A giant armadillo moving northward with a constant acceleration covers the distance between two points 60 m apart in 6
seconds. Its velocity as it passes the second point is 15m/s.
Answer:
a = 1.66 m /s²
Explanation:
This is a kinematics exercise
v = v₀ + a t
x = v₀ t + ½ a t²
we solve for the initial velocity in the first equation and substitute in the second
v₀ = v - at
x = (v- at) t + ½ a t²
x = vt - a t² + ½ a t²
x = v t - ½ a t²
we seek acceleration
a = (v t -x) 2 / t²
let's calculate
a = (15 6 - 60) 2/6²
a = 1.66 m /s²
If a violin string vibrates at 248 Hz as its fundamental frequency, what are the frequencies of the first four harmonics?
Answer:
The frequencies of the first four harmonics are 248 Hz, 496 Hz, 744 Hz, and 992 Hz
Explanation:
Given;
fundamental frequency, f₀ = 248 Hz
Frequency of the nth harmonic = n x fundamental frequency
First harmonic, f₁ = 1 x f₀ = 248 Hz
Second harmonic;
2f₀ = 2 x 248 Hz = 496 Hz
Third harmonic
3f₀ = 3 x 248 Hz = 744 Hz
Fourth harmonic
4f₀ = 4 x 248 Hz = 992 Hz
Therefore, the frequencies of the first four harmonics are 248 Hz, 496 Hz, 744 Hz, and 992 Hz
If someone told you that they traveled 50 km east, are they describing the distance they traveled or their displacement? How do you know? *
Answer:
They are describing their displacement
Explanation:
The correct answer would be that they are describing their displacement.
Distance is a scalar quantity while displacement is a vector quantity. A scalar quantity only has magnitude without any indication of the direction while a vector quantity has both magnitude and direction.
Hence, if someone travels 50 km east, the distance they covered is only 50 km while the displacement is 50 km in the eastward direction.
A ray of white light moves through the air and strikes the surface of water in a beaker. The index of refraction of the water is 1.33 and the angle of incidence is 30º. All of the following are true EXCEPT:I. the angle of reflection is 30º.II. the angle of refraction is 30º.III. total internal reflection will result, depending on the critical angle.
Answer:
La frecuencia será la misma en los dos medios, y en el vacio, no varia.
b) Vacío : n = 3,684 10 m 1,33 = 4 900 Å ,3161 10 m 55,1 n
,6 105 10 Hz
3,161 10 m
v 1,93 10 m/s 193548,38 km/s =
1,55
10 3 m/s
n
c
Vidrio v: =
,6 107 10 Hz
3,684 10 m
v 2,25 10 m/s 225 000km/s =
33,1
10 3 m/s
n
c
a
Which of these actions is an example of chemical weathering? A. Freezing water widens the cracks in rocks B. plant roots force their way into cracks and rocks and brake them C. oxygen an area eggs with our content in rocks causing them to change color D. strong winds peel soft rock away leaving hard rock behind
Answer:
A. freezing water widens the cracks in rocks
Explanation:
chemical weathering (from what i can tell anyways) is when water comes in contact with rocks and over time wears it down.
Why do you think it is important to recycle materials?
Answer:
To use them in future projects and saving the community.
Explanation:
An explanation about using them in future projects is that you can, for example, use plastic for a biology project. It's also a proven fact that recycling can help the environment so there will be less pollution due to having certain recyclables in the wrong places such as the ocean.
If one were to stack thick fabric fabric on top of one another, then push the opposite ends towards one another, resulting and bending and rumpling, this would illustrate what physical process?
Answer:
The answer is "folding".
Explanation:
It is a physical reconfiguring of the process, which gives a fabric a softer, lightweight shape. It is achieved in a far less simple space to carry or store products.
When one places effect sizes on each other, instead move the different ends to each other and fold and roll it, its linear function of Folding would be illustrated. Except in geography, the piling process naturally creates space to makes the surface clearer and lighter.How many electrons does an atom have with 10 protons and an ionic charge of 2+
Answer:
8
Explanation:
Charge = protons − electrons
2 = 10 − e
e = 8
The closest meaning to the word hypothesis is
Answer:
A hypothesis is an idea or explanation that you then test through study and experimentation.
Answer:an educated guess
How does work affect energy between objects so it can cause a change in the form of energy? Work transfers energy. Work changes energy. Work increases energy. Work decreases energy.
Answer: Work can transfer energy between objects and cause a change in the amount of total energy. Work can transfer energy between objects and cause a change in the form of energy. ... When a spring is compressed, the energy changes from kinetic to potential.
Answer:
work can transfer energy
Explanation:
sense there is a ton of effort in work it can accumulate energy. physical and thermal energy. :)