Answer:
yes
Explanation:
A critical period?
A.begins and ends abruptly
B.begins and ends gradually
C.is unaffected by stimuli
D.is unlikely to impact development
correct answer (A.begins and ends abruptly )
Answer:
yes it is true
Explanation:
i took a test and that is true
A woman stands in a boat at rest on a calm lake. She throws a 10 kg anchor off the front of the boat, which has a mass of 1,000 kg
What is the initial momentum of the anchor-boat system?
A)1,000 kg m/s
B)zero because both objects are at rest.
C)1,010 kg m/s
D)10,000 kg m/s
PLEASE HELP!! I don’t understand
Answer: B) zero because both objects are at rest
Explanation:
Given the following :
Mass of anchor = 10kg
Mass of boat = 1000kg
Note : both boay and anchor are at rest, this gives a Velocity of zero
The momentum of a body is given as the product of Mass and velocity, that is,
Momentum = mass × velocity
Initial Momentum of anchor-boat system =
(mass of boat× initial velocity of boat) + (mass of anchor × initial velocity of anchor)
Initial Velocities of boat and anchor = 0
Therefore,
Initial momentum = (1000 × 0) + (10 × 0)
Initial momentum = (0 + 0) = 0
This is ecause both objects are at rest.
a runner with a mass of 62 kg running at speed of 0.8m/s
According to the question,
Mass, m = 62 kgSpeed, v = 0.8 m/sThe Kinetic Energy will be:
= [tex]\frac{1}{2}mv^2[/tex]
By putting the values,
= [tex]\frac{1}{2}\times 62\times (0.8)^2[/tex]
= [tex]31\times 0.64[/tex]
= [tex]20 \ Nm[/tex]
Thus the above answer is right.
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A spring extends by .16 meters when pulled with 20 N of Force. What is the Potential Energy in the spring at this extension?
What is the work done to extend the spring. 16 meters?
Answer:
Potential energy = 1.6 J
Work done = -1.6 J
Explanation:
Potential Energy in the spring at this extension?
The potential energy U in the spring is U = 1/2kx² where k = spring constant = F/x where F = force = 20 N and x = extension = 0.16 m. So k = 20 N/0.16 m = 125 N/m
U = 1/2kx²
= 1/2 × 125 N/m × (0.16 m)²
= 1.6 J
What is the work done to extend the spring. 16 meters
Work done W = U₁ - U₂ where U₁ = initial potential energy = 0 and U₂ = final potential energy = 1.6 J
W = 0 - 1.6 J
= -1.6 J
What is the force of gravity on a 24.0 kg table sitting on the earth
Answer:
24×9.8Explanation:
Por una espira de 0.5 m2 de área circula una corriente de 5 A. Calcula la densi- dad de flujo magnético B considerando que la espira considera la permeabilidad del medio es la del aire
Answer:
[tex]\beta=B=8.05\mu T[/tex]
Explanation:
The density of the magnetic flux is given by the following formula:
[tex]\beta=\frac{\Phi_B}{A}=\frac{ABcos\theta}{A}=Bcos\theta[/tex]
The normal vector A and the vector of the magnitude of the magnetic field are perpendicular, then, the angle is zero:
The magnitude of the magnetic field is calculated by using the formula for B at a distance of x to a point in the plane of the loop:
[tex]B=\frac{\mu_oIR^2}{2(x^2+R^2)^{3/2}}[/tex]
For x = 0 you have:
[tex]B=\frac{\mu_oIR^2}{2R^3}=\frac{\mu_oI}{2R}[/tex]
R is the radius of the circular loop and its values is:
[tex]R=\sqrt{\frac{A}{\pi}}=\sqrt{\frac{0.5m^2}{\pi}}=0.39m[/tex]
Then, you replace in the equation for B with mu_o = 4\pi*10^-7 T/A:
[tex]B=\frac{(4\pi*10^{-7}T/A)(5A)}{2(0.39m)}=8.05*10^{-6}T=8.05\mu T[/tex]
and the density of the magnetic flux is
[tex]\beta=B=8.05\mu T[/tex]
1. A drop of oil of volume 10-10 m spreads out on water to
make a circular film of radius 10 m. what is the thickness
of the film?
Answer:
318.3 nm
Explanation:
We approximate the circular film as a cylinder of height h and radius, r. Its volume V = πr²h. Since this volume equals the volume of the oil drop, the height of the circular film is thus h = V/πr²
V = 10⁻¹⁰ m³ and r = 10 m
Substituting into h, we have
h = 10⁻¹⁰ m³/π(10)²
= 0.3183 × 10⁻¹² m
= 3183 × 10⁻⁹ m
= 318.3 nm
1) A U-tube, in which both ends are open to the atmosphere, is partially filled with water. Oil which does not mix with water is poured into one side of the tube until it stands a distance d=12.3 mm above the water level on the other
side which has meanwhile risen a distancea=67.5 mm from its original level Find the density of the oil
2) The mercury column in a barometer has a measured height h of 740.35 mm. the temperature is-5.0 C
which temperature the density of mercury is 1.3608 104 kg/m3. the free-fall acceleration at the site of the
barometer is 9.7835 m/s2. What is the atmospheric pressure?
Answer:
1) 916 kg/m³
2) 9.8566×10⁴ Pa
Explanation:
1) Originally, the water is at the same level on both sides. When the oil is added, one side goes down 67.5 mm and the other side goes up 67.5 mm. The top of the oil is 12.3 mm above the water, so the total height of the oil relative to the low end of the water is:
12.3 mm + 67.5 mm + 67.5 mm = 147.3 mm
And the height of the water relative to the low end is:
67.5 mm + 67.5 mm = 135 mm
The pressure at the bottom of the oil equals the pressure of the water at the same elevation.
P = P
ρgh = ρgh
ρh = ρh
ρ (147.3 mm) = (1000 kg/m³) (135 mm)
ρ = 916 kg/m³
2) P = ρgh
P = (1.3608×10⁴ kg/m³) (9.7835 m/s²) (0.74035 m)
P = 9.8566×10⁴ Pa
Why do your legs appear shorter when standing in water
A force of 20N acts on a 3.5kg mass for 10s. What is the change in the speed of the object? *Hint find the impulse first*
2 points
Answer:
I don't know sorry bro .. .... please make me braniestThe law of conservation of energy states...
Which are referred to as greenhouse gases?
nitrogen and oxygen
oxygen and carbon dioxide
water vapor and oxygen
water vapor and carbon dioxide
(Plz help)
how is matter identified
Answer:
It can be identified using physical properties such as density
Explanation:
Matter is any substance that has mass and takes up space. Therefore, it can be identified using physical properties such as density
Explanation:
We can identify matter by:
1.physical properties.
2.chemical properties.
Hope this helps...
explain how conduction, convention and radiation all transfer heat when cooking in a pan of water.
Answer:
hope this helps love! There are three methods of heat transfer: conduction, convection, and radiation. Cooking of food usually uses a combination of these methods. Conduction transfers the heat using direct contact; food is heated directly in a metal pan, in a liquid, or surrounded by air. ... The heat from the water is transferred to the egg.
Explanation:
When the water is heated, thermal expansion happens so the particles move farther apart and then the hot water moves up because it is less dense then the colder water. ... Convection is happening because when air is heated by the fire, the air becomes less dense and moves up because denser things sink.
Pls help I'm desperate
If you place a hot piece of metal in a container of water, thermal energy flows from the metal to the water. What happens after the metal and the water reach the same temperature?
The flow of thermal energy stops, and the temperature remains constant.
The flow of thermal energy continues and causes both substances to become warmer.
The flow of thermal energy reverses and causes both substances to become warmer.
The flow of thermal energy reverses, and the water becomes colder.
Answer:
I think your answer would be D
Explanation:
Collision 1: Blue Cart Initially at Rest Set the initial blue cart velocity to 0 m/s. Set the mass values to different values. Run the simulation and record the mass and velocity values. Before Collision After Collision mRed = _________ kg mBlue = _________ kg Use mass and velocity values to complete the following momentum table. Before Collision After Collision ∆Momentum Red Cart ________kg x _______m/s = ____________kg•m/s ________kg x _______m/s = ____________kg•m/s Blue Cart ________kg x _______m/s = ____________kg•m/s ________kg x _______m/s = ____________kg•m/s
Answer:
it is very hard but i am trying to help you.
Explanation:
An object, with a final position of x = 100.1 meters, initially started at x = -12.13 meters. What was its displacement? (Unit = m)
Answer:
112.23 m
Explanation:
Displacement is the final position minus the initial position.
Δx = x − x₀
Δx = 100.1 m − (-12.13 m)
Δx = 112.23 m
the process of converting a solid into liquid at its melting point is called fusion(true or false)
False, the process of converting a solid into liquid at its melting point is called melting.
What is fusion ?
When two light atoms combine to form a new heavier nucleus this process is known as fusion. For example, when two hydrogen atoms combine to form helium atom.
Upon reaching a substance's melting point, the heat supplied by the substance (latent heat of fusion) causes the molecules to drift apart and the substance changes state (solid to liquid) by increasing its internal energy, resulting in a temperature decrease and a change of state (solid to liquid).
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A car travels 20 km South, then turns and travels 30 km East? What is the total displacement?
Answer:
Explanation:36.05 km
Given
First car travels [tex]r_1=20\ km[/tex] South
then turns and travels [tex]r_2=30\ km[/tex] east
Suppose south as negative y axis and east as positive x axis
So, [tex]r_1=-20\hat{j}[/tex]
[tex]r_2=30\hat{i}[/tex]
Displacement is the shortest between initial and final point
Dispalcement[tex]=r=r_1+r_2[/tex]
Displacement[tex]=-20\hat{j}+30\hat{i}[/tex]
Displacement[tex]=30\hat{i}-20\hat{j}[/tex]
Magnitude [tex]=\sqrt{30^2+(-20)^2}[/tex]
Magnitude[tex]=36.05\ km[/tex]
A rocket weighing 560,000 N is taking off from Earth with a total thrust of
700,000 N at an angle of 20 degrees, as shown in the image below. What is
the approximate vertical component of the net force that is moving the rocket
away from Earth?
A. 76,000 N
B. 112,000 N
C. 132,000 N
D. 98,000 N
Answer:
D
Explanation:
LA FUERZA NETA ES LA FUERZA TOTAL DE EMPUJE MENOS EL PESO DEL
COHETE.
[tex]F_{y}[/tex] = 700000 N(sen 90° - 20°) - 560000 N = 97785 N
The approximate vertical component of the net force that is propelling the rocket away from Earth is 112,000 N. Option B is correct.
The net force acting on the rocket is the sum of the thrust force and the weight of the rocket. The thrust force is pointing upwards at an angle of 20 degrees, and the weight of the rocket is pointing downwards. The thrust force is the force that is generated by the rocket engine. It is the force that propels the rocket upwards.
The weight of the rocket is the force of gravity acting on the rocket. It is the force that pulls the rocket downwards. The net force acting on the rocket is the sum of the thrust force and the weight of the rocket. If the net force is positive, the rocket will accelerate upwards. If the net force is negative, the rocket will accelerate downwards. If the net force is zero, the rocket will remain at rest.
net force = thrust force + weight
vertical component of net force = thrust force * cos(angle)
vertical component of net force = 700,000 N * cos(20 degrees) = 112,000 N. Option B is correct.
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The speed of sound is greater through a solid than through a gas because the molecules in a solid are
Answer
medium are much closer together
Explanation:
Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air.
If the mass of the tritium nucleus is 3.02 universal mass units and the mass of the helium nucleus is 4.00 universal mass units, how much energy (in Megaelectronvolts) is absorbed as the tritium decays into helium?
Answer: the answer is a
Explanation just did the test
how can the nail be demagnetised
Explanation:
How do you demagnetize a nail?
To unscrew the magnetized nail or to demagnetize a nail magnetized by prolonged contact or rub, banging the nail on a hard surface or dropping it to the ground shaking up the aligned atoms with a sharp effect. For the electric magnet, simply separating one end of the copper wire from the terminal kills the magnetic field
Hope this can help you. Good Luck!
describe how electromagnetic radiation can ionise an atom. 2 marks
Answer:
Ionizing radiation is radiation with enough energy so that during an interaction with an atom, it can remove tightly bound electrons from the orbit of an atom, causing the atom to become charged or ionized. ... Forms of electromagnetic radiation.
(from google)
thank you :)
Ionizing radiation is radiation with enough energy that to remove tightly bound electrons from the orbit of an atom, causing that atom to become charged or ionized.
What is ionizing radiation?The process in which an electron is given enough energy to break away from an atom is called ionization.
This process results in the formation of two charged particles or ions:
The molecule with a net positive chargeThe free electron with a negative charge.Each ionization releases energy that is absorbed by material surrounding the ionized atom.
Ionizing radiation deposits a large amount of energy into a small area. In fact, the energy from one ionization is more than enough energy to disrupt the chemical bond between two carbon atoms.
There are three main kinds of ionizing radiation:
alpha particles, which include two protons and two neutrons
beta particles, which are essentially electrons
Therefore,
According to the definition of ionizing radiation,
Ionizing radiation can remove electrons from the atoms, i.e. It can ionize atoms.
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ANSWER=
If a group of workers can apply a force of 1,000 Newtons to move a crate
20 meters, what amount of work will they have accomplished?
Answer:
W= 20000j
Explanation:
W= fd = 1000N(20m) = 20000j
Esimate and add to the nearest thousand
6,521+1,063+901
Answer: I think it's 8,900
Explanation:because since you need to estimate it to the nearest thousand so 6,521 would be 7,000 and then 1,063 would be 1,000 and then 901would turn into 900 so then you add them all up and ur answer will be 8,900.
But I'm sorry if this was not the answer u were looking for
What does a simple pulley do?
A. It makes you have to pull harder on the rope.
B. It increases the force.
O O O O
C. It redirects the force.
D. It makes the load heavier.
Answer:
C. It redirects the force
You are pushing this M = 115-kg box with Fa = 424 Newtons. (Fa = "Your applied force") But it's futile. The box isn't going anywhere. Calculate the frictional force of the floor on the box against you.
Explanation:
We have,
Mass of a box is 115 kg
Applied force is 424 N
It is required to find the frictional force of the floor on the box against you. Frictional force is an opposing force. It opposes the motion of an object. Here the applied force is 424 N. So, the frictional force has a magnitude of 424 N but it acts in opposite direction.
A women walks 550m North,then 350 m west,then 250 m south ,then 450m east, and finally 150 m south.The whole journey took 1 hour 45 minutes.
a)construct a scale diagram to illustrate the path of the women.Scale:1cm=100
Answer:
The scale diagram is in the image attached
Explanation:
The scale diagram is in the image attached.
The North direction is upwards in the diagram, the West is to the left, the East is to the right and the South is downwards.
First movement: 550m north -> 5.5 cm upwards
Second movement: 350m west -> 3.5 cm to the left
Third movement: 250m south -> 2.5 cm downwards
Fourth movement: 450m east -> 4.5 cm to the right
Fifth movement: 150m south -> 1.5 cm downwards
Hope it helps!
A car of mass 750 kg has an initial speed of 75 mph. Traveling in a straight line, its speed is increased uniformly to 120 mph in 2.0 miles. What is the net force that was exerted?
Explanation:
ESTE PROBLEMA ES MEJOR HACERLO EN SI. PRIMERO CONVIERTES
LA VELOCIDAD INICIAL Y LA VELOCIDAD FINAL A m/s
[tex]v_{0}[/tex] = 33.52 m/s v = 53.67 m/s x = 3220 m
PRIMERO ENCUENTRAS LA ACELERACIÓN DEL COCHE CON LA ECUACIÓN
DE GALILEO GALILEI
a = [tex](53.67 m/s)^{2} - (33.52 m/s)^{2}/3220 m[/tex] = [tex]0.5453 m/s^{2}[/tex]
AHORA CON LA ACELERACIÓN USMOS LA SEGUNDA LEY DE NEWTON
F = 75 kg([tex]0.5453 m/s^{2}[/tex]) = 40.9 N
the force exerted by the mass is 204 N.
The given parameters;
mass of the car, m 750 kg
initial speed of the car, u = 75 mph
final speed of the car, v = 120 mph
distance traveled by the car, s = 2 miles
The acceleration of the car is calculated as;
[tex]v^2 = u^2 + 2as\\\\2as = v^2 - u^2\\\\a = \frac{v^2 - u^2}{2s} \\\\a = \frac{120^2 - 75^2}{2\times 2} \\\\a = 2193.75 \ mi/hr^2\\\\a = 2193.75 \frac{mi}{hr^2} \times \frac{1609.3 \ m}{1 \ mile} \times \frac{1hr^2}{(3600 \ s)^2} \\\\a = 0.272 \ m/s^2[/tex]
The force exerted by the mass is calculated as follows;
F = ma
F = 750 x 0.272
F = 204 N
Thus, the force exerted by the mass is 204 N.
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A complete electric circuit includes a voltage source, current, wires, and something to _________ the flow of current.
Answer:
If you ground the flow of current like the last part of your question states you will not have a complete circuit as the circuit will open on a short circuit. To make a complete circuit operate you need a power source, an overload device to protect the conductors of the circuit, conductors to carry the current and a load across the power source which causes the current to flow in the circuit.
Explanation:
Leave any one of these things out and you will not have a complete circuit.
A complete electric circuit includes a voltage source, current, wires, and load to flow the current.
What is load in an electric circuit?An electrical load can be described as an electrical component of a circuit that consumes electrical power such as electrical appliances, bulbs, and lights. The electrical load may also refer to the power consumed by a circuit. An electrical load is opposed to a power source, such as a battery, which produces power.
If an electric circuit contains an output port, a pair of terminals that generates an electrical signal, the circuit connected to this terminal is the load. Load influences the performance of circuits according to the output voltages or currents, such as voltage sources, and amplifiers.
Mains power outlets supply power at constant voltage, with electrical appliances connected to the power circuit making up the load. When a high-power device switches on, it drastically reduces the load impedance.
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