Which of the following is true about light with a single wavelength?

1) It can be refracted
II) It cannot be dispersed
III) It can be reflected *

Answer:

Step-by-step-explanation :

Electric resistance

Dimension length :

Squared mass per time cubed , that is , electric current squared.

The SI derived unit of electric resistance is the ohm,(volt per ampere).

A.) Steel.

steel travels 5,060 meters per second,

lead travels 1,402 meters per second,

water travels 1,439 meters per second,

and air depends on temperature.

Answer:

The nucleus has very important roles to play. As it contains genetic material, it coordinates cell activities like protein synthesis and cell division.

Explanation:

Answer:

1.5g/cm³

Explanation:

Given parameters:

Initial volume of the liquid  = 30cm³

Final volume of the liquid  = 50cm³

Mass of the liquid  = 30g

Unknown:

Density of the liquid  = ?

Solution:

Density is the mass per unit volume of a substance.

  Density  = [tex]\frac{mass}{volume}[/tex]  

volume of the liquid  = final volume - initial volume  =  50cm³  -  30cm³

 volume of the liquid  = 20cm³

Density  = [tex]\frac{30}{20}[/tex]   = 1.5g/cm³

Equation of power in a electrical circuit is given as:

[tex] \bf P = I^2R[/tex]

I → Current flowing through the circuit.

R → Resistance of the circuit

We need to calculate power when;

Current (I) = 0.02 A

Resistance (R) = 30 Ω

By substituting values in the equation, we get:

[tex] \rm \longrightarrow P = (0.02)^2 \times 30 \\ \\ \rm \longrightarrow P = 0.0004 \times 30 \\ \\ \rm \longrightarrow P = 0.012 \: W[/tex]

[tex] \therefore [/tex] Power in the circuit = 0.012 W

Answer:

Momentum, product of the mass of a particle and its velocity. ... Momentum is a vector quantity; i.e., it has both magnitude and direction. Isaac Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle.

Answer:

The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in.

Explanation:

hope this helps

The factors affecting potential energy of a body are mass, acceleration due to gravity, and height above the ground.

Potential energy is the energy that a body possess as a resulting its state or position relative to the ground.

Mathematically;

Therefore, the factors affecting potential energy of a body are mass, acceleration due to gravity, and height above the ground.

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Answer:

why did the parents let go of their child-

Explanation:

A 5 kg, because 90 / 18 is 5

The mass of the carriage is 10 kg

The formular for kinetic energy

K.E= 1/2mv²

Kinetic energy= 90 joules

velocity= 18 m/s

mass= ?

90= 1/2 × mass × 18

90= 0.5 × 18 × mass

90= 9 × mass

mass= 90/9

= 10 kg

Hence the mass of the carriage is 10 kg

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Answer: A.

Explanation:

took the test just now

A battery supplies electrical energy to a circuit Chemical reactions in a battery cause positively and negatively charged particles to separate and become concentrated at the battery terminals. The correct option is A.

A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products

Chemical reactions in a battery cause positively and negatively charged particles to separate and become concentrated at the battery terminals resulting in the transformation into electrical energy therefore the correct option is A.

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Answer:

V = 2.79 m/s

Explanation:

Momentum before = momentum after

Erica's momentum = 0

Danny momentum = 49 kg * 4.9 m/s = 240.1 kg-m/s

240.1 + 0 = (37 + 49) kg * V

86 V = 240.1

V = 2.79 m/s

Answer:

[tex] \boxed{{160 \: m(s)}^{ - 1} }[/tex]

Explanation:

[tex]if \:the \: frequencies \: are \to \\ f_{1} = 640Hz \\ and \\f_{2} = 480Hz \: \\ but \: \boxed{v = f \gamma }: f = \frac{v}{ \gamma } \\ if \: \gamma_{1} - \gamma _{2} = 1 = \gamma \\ f_{1} - f_{2} = 640 - 480 = \boxed{ 160Hz} = f \\ v = f \gamma = 160 \times 1 = \boxed{{160 \: m(s)}^{ - 1} }[/tex]

Answer:

A) Vo = 137.34 [m/s]

B) Y = 961.38 [m]

C) y = 367.8[m] for t = 3 [s] and y = 470.88[m] for t = 4[s]

Explanation:

To solve this problem we must use the following equation of kinematics. We must keep in mind that the negative sign of the equation means that the acceleration of gravity acts in the opposite direction to the movement of the balloon.

A)

[tex]v_{f} =v_{o} -g*t[/tex]

where:

Vf = final velocity = 0 (the maximum hang time, maximum elevation)

Vo = initial velocity [m/s]

g = gravity acceleration = 9.81 [m/s²]

t = time = 14 [s]

0 = Vo - (9,81*14)

Vo = 137.34 [m/s]

B)

Now we use the following equation.

[tex]y=y_{o}+v_{o} *t -(\frac{1}{2} )*g*t^{2}[/tex]

where:

Yo = initial position = 0

Y = final position [m]

Vo = initial velocity = 137.34 [m/s]

Now replacing

Y = (137.34*14) - (0.5*9.81*14²)

Y = 961.38 [m]

C)

With the above equation, we can calculate the distances between t = 3 and t = 4 [s]

[tex]y=y_{o} +v_{o} *t - (1/2)*g*t^{2}[/tex]

y = (137.34*3) - (0.5*9.81*3²)

y = 367.8[m] for t = 3 [s]

for t = 4[s]

y =  (137.34*4) - (0.5*9.81*4²)

y = 470.88[m]

Answer:

it would have to be 1000 netons

Answer:

C

Explanation:

acceleration is a change in velocity which means a time rate change in velocity but velocity is the time rate change in displacement

Answer:

5.5 KG is the mass

53.9 is the Weight

Answer:The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.

Answer:

Chemistry, physics, astronomy and earth science.

Explanation:

The four main categories of physical sciences are chemistry, physics and earth science and astronomy. Life sciences deal with living organisms and behavioral sciences deals with the interactions between organisms in the natural world.

Answer:

Mass is 152.95743

weight in ibs 3304.6914215069355 ibs

EXPLANATION:

1500 N = 152.95743 KG

152.95743 KG × 9.8 = 1498.982814

1 KG is 2.2 IBS

so

14o8.982814 is 3304.6914215069355

In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.

Electric current is defined as the rate of flow of electric charge through any cross-section in an electric circuit.

Here,

1) In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.

2) Some materials are not magnetic because, they have equal number of electrons that spin in opposite direction. Thus, the paired electrons spin in opposite directions, cancelling their magnetic fields.

3) According to Right-hand thumb rule, if Keisha's thumb points in the direction of an electrical current, her fingers curled around the wire will represent the direction of magnetic field.

4) Resistance of the light bulb, R = 20 Ω

   Current flowing through the light bulb, I = 30 A

Voltage of the battery,

V = IR

V = 30 x 20

V = 600 V

5) The deflection in the needle of the compass is due to the change in the Earth's magnetic field.

6) The batteries are not able to power all three light bulbs like the generator because, the generator current is more steady.

7) The attraction of the metal objects towards the electrical device is due to an electrical wave oscillating perpendicular to the electrical device.

8) Current in the first tablet, I₁ = 10 A

Voltage applied, V = 150 V

We know that,

I [tex]\alpha[/tex] 1/R

Therefore,

I₁/I₂ = R₂/R₁

I₂ = R₁I₁/R₂

I₂ = R x 10/2R

I₂ = 10/2 = 5 A

So, the current of the second tablet is 5 A.

Hence,

In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.

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Answer:

sound travels faster in the night

Explanation:

Answer:

Acceleration is (48-14)/40 m/s² = 34/40 m/s² = 0.85 m/s²

The acceleration acting on the train during this time of travel is 0.85m/s²

HOW TO CALCULATE ACCELERATION:

Where;

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Answer:

I love yourself help yourself

The wire that lies within a magnetic field must be true for the magnetic field to produce an electric current in the wire is, and the field must be moving. Hence, option C is correct.

Magnetic forces can be seen in a magnetic field, an electric current, a changing electric field, or a vector field around a magnet. Compass blades and other ferromagnetic materials align in the path of magnetic fields like the one found on Earth.

Electrically charged particles are forced to move in a circular or helical pattern by magnetic fields. The operation of electric motors is caused by this force, which is applied to electrical impulses in wires in such a magnetic field.

Magnetization is stationary and is referred to as a magnetization field when it surrounds a magnetic core or a wire delivering a constant electric current in a single direction.

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Answer:

The field must be moving (C)

Answer:

(a) h = 16.53 m (b) t = 1.83 s

Explanation:

Given that,

The initial velocity of a ball, u = 18 m/s

When it reaches to the maximum height, its final velocity v will be 0. Let it goes to a maximum height of h meters.

Finding t using first equation of motion as follows :

v = u +at

Here, a = -g and v = 0

[tex]t=\dfrac{u}{g}\\\\t=\dfrac{18}{9.8}\\\\t=1.83\ s[/tex]

The time needed for the ball to reach its max height is 1.83 s.

Let h is the maximum height. Using second equation of motion to find it :

[tex]h=ut-\dfrac{1}{2}gt^2\\\\h=18(1.83)-\dfrac{1}{2}\times 9.8\times (1.83)^2\\\\h=16.53\ m[/tex]

So, it will go to a maximum height of 16.53 m.

Answer:

the force of gravity between them is quadrupled .

Explanation:

Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces.

Answer:

W = 1710 kJ

Explanation:

Given that,

Power of a race car, P = 255 hP = [tex]1.9\times 10^5\ W[/tex]

It accelerate from rest to its top speed in 9.00 s.

We need to find the work does the car's engine do in this interval of time.

Power is given by work done per unit time. Mathematically,

[tex]P=\dfrac{W}{t}\\\\W=P\times t\\\\W=1.9\times 10^5\times 9\\\\W=1710\ kJ[/tex]

So, the required work done is is 1710 kJ.