Someone please tell me the answer with working please!! I

Answer:

Doppler effect to analyze the motion and properties of the star and planet.

Explanation:

The radial velocity method invovles watching the spectral lines of a star as a planet orbits around the star. Because of the planets gravitational pull on the star, will wobble. This causes Doppler shifts in the spectral lines, allowing astronomers to infer the presence of the planets.

If the pull is done horizontally, then the net force on the car is

∑ F = T - f = (1500 kg) (3 m/s²)

where T is the magnitude of the tension in the towing cable, and f is the friction which points in the opposite direction. Then

T = f + (1500 kg) (3 m/s²)

T = 2500 N + 4500 N

T = 7000 N

Answer:

48 students will ride on each bus.

Explanation:

192 students divided by 4 busses comes out to 48 students per bus.

Basically: 192/4=48

Answer:

30 mins

Explanation:

speee=distance/time

300m/h=15m/time

time=15miles/300miles/hous=1/2 hours=30 mins

Answer:

30 minutes.

Explanation:

If it takes you an hour to run 30 miles but you only need to run 15 miles then you split that hour in half, which results in half an hour or 30 minutes.

Answer:

A. a rigorously tested explanation

Explanation:

Answer:

The answer is option letter B

Answer:

C)the distance decreases Shorter wavelength

Step by step Explanation:

Answer:

the answer is the core

Explanation:

the core is composed of iron and nickel

Answer:

Left is deciamled to the right [tex]x_{123}[/tex]

Explanation:

Answer:c

Explanation:c

This question involves the concepts of the time period, orbital radius, and gravitational constant.

The theoretical period of the moon is "658 hr".

The theoretical time period of the moon around the earth can be found using the following formula:

[tex]\frac{T^2}{R^3}=\frac{4\pi^2}{GM}[/tex]

where,

T = Time Period of Moon = ?

R = Orbital Radius = 3.84 x 10⁸ m

G = Gravitational Constant = 6.67 x 10⁻¹¹ N.m²/kg²

M = Mass of Earth = 5.97 x 10²⁴ kg

Therefore,

[tex]\frac{T^2}{(3.84\ x\ 10^8\ m)^3}=\frac{4\pi^2}{(6.67\ x\ 10^{-11}\ N.m^2/kg^2)(5.97\ x\ 10^{24}\ kg)}\\\\T^2=(9.91\ x\ 10^{-14}\ s^2/m^3)(56.62\ x\ 10^{24}\ m^3)\\\\T=\sqrt{561.34\ x\ 10^{10}\ s^2}[/tex]

T = 2.37 x 10⁶ s[tex](\frac{1\ h}{3600\ s})[/tex]

T = 658 hr

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The attached picture shows the derivation of the formula for orbital speed.

Answer:

A

Explanation:

Trust me I just took it !

Answer:

How much power is used if 350J of work is done when pushing a box for 5 seconds.

Explanation:

the answer is 70watts

Answer:

The movement of energy

Explanation:

Answer:

the movement of energy

Answer:

Explanation:

Given that the velocity of the river is 1.50m/s due east.

The velocity of the boat with respect to the river is 10.0 m/s due north .

The width of the river is 325 m.

Note that the velocity of the boat will help in crossing the river.

Hence, speed = distance/time

Speed = 10.0 m/s

Distance = 325 m

Time = ?

10 = 325/time

Time = 325/10

Time = 32.5s

Hence in 32.5s the horizontal distance traveled by boat will be

= 1.50m/s × 32.5s

= 48.75m

Answer:

B. Longitudinal wave

Explanation:

It's the only option that makes sense. Hope this helped :)

Answer:

Explanation:

The force of static friction acting on the box is the frictional force;

Frictional force Ff = Wsin theta (force acting along the ramp)

W is the gravitational force known as the weight

Ff = 112.1sin42°

Ff = 112.1(0.6691)

Ff = 75.00N

Hence he force of static friction acting on the box  if box has a gravitational force of 112.1 N id 75.00N

Answer:

75N i did test

Explanation:

Answer: Conductor, semiconductor, insulator

Explanation:

Just did the quiz

The correct option is option A.

The descending order in which electrons flow easily is:

Conductor, semiconductor, insulator

The correct order for materials by their ability to allow the flow of electrons, from most easily to least easily is Conductor, semiconductor, insulator.

Conductors are generally metals, they have plenty of free electrons due to which the electron flow is easy. Also, the conduction band and valance band in a conductor overlap, so they can conduct at room temperature.

In the case of semiconductors, the band gap between the conduction band and valance band is almost 1eV, so a little energy is enough to make the flow of electrons possible

Whereas, in insulators, the band gap is quite high and electrons can not jump from the conduction band to the valence band due to which the flow of electrons is not possible.

Learn more about band gap:

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Answer:

I do drink bottled water but not to often, I live about 2.8 miles away from its water source and if i did'nt drink bottled water and I had to found out how my drinking water is treated I would go ask the people that are taking care of the water.

Explanation:

hope this helps

Answer:

The final velocity of the boy and the skateboard is 1.93 m/s.    

Explanation:

We can find the final velocity of the boy and the skateboard by conservation of linear momentum:

[tex] P_{1} = P_{2} [/tex]

[tex] m_{b}v_{i_{b}} + m_{s}v_{i_{s}} = m_{b}v_{f_{b}} + m_{s}v_{f_{s}} [/tex]  (1)

Where:

[tex]m_{b}[/tex]: is the boy's mass = 55 kg

[tex]m_{s}[/tex]: is the skateboard's mass = 2.0 kg

[tex]v_{i_{b}}[/tex]: is the initial speed of the boy = 2.0 m/s

[tex]v_{i_{s}}[/tex]: is the initial speed of the skateboard = 0

[tex]v_{f_{b}}[/tex]: is the final speed of the boy =?

[tex]v_{f_{s}}[/tex]: is the final speed of the skateboard =?

Since the boy and the skateboard will have the same final velocity by entering the above values into equation (1) we have:

[tex] 55 kg*2.0 m/s + 0 = v_{f}(55 kg + 2.0 kg) [/tex]

[tex] v_{f} = 1.93 m/s [/tex]

Therefore, the final velocity of the boy and the skateboard is 1.93 m/s.    

I hope it helps you!                                

The final velocity of the boy and the skateboard is 1.93m/s

According to the law of conservation of momentum, the momentum of the bodies before the collision is equal to the momentum of the bodies after the collision.

Mathematically, [tex]m_1u_1+m_2u_2=(m_1+m_2)v[/tex]

[tex]m_1 \ and \ m_2[/tex] are the masses of the object

[tex]u_1 \ and \ u_2[/tex] are the velocities of the object

v is the final velocity

Given the following parameters

m₁ = 55kg

u₁ = 2.0m/s

m₂ = 2.0kg

u₂ = 0m/s

Required

Final velocity "v"

Substitute the given parameters into the formula to have:

[tex]55(2)+2(0)=(55+2)v\\110=57v\\v=\frac{110}{57}\\v= 1.93m/s[/tex]

Hence the final velocity of the boy and the skateboard is 1.93m/s

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Answer:

Density of the ship :133.33 kg/m³

Mass of the ship :50,000,000 kg

Ships are able to float on water because they displace a volume that equals  their own weight

Explanation:

The formula for density is ;

Density = Mass/Volume

But the mass of  displaced fluid is give by the formula;

m=ρV where ρ is density of the fluid and V is volume of water displaced

Volume of liner= 375000 m³

Volume displaced = 50000 m³

The volume of the water displaced is equal to mass of the liner

I m³ = 1000 kg

50000 m³ = 50000*1000 =50,000,000 kg

50,000,000 kg ----------mass of the ship

So if ;

m= 50,000,000 kg

v= 375000 m³

ρ = m/V

ρ = 50,000,000/375000

ρ = 50,000,000/375000

ρ =133.33 kg/m³

Ships are able to float on water because they displace a volume that equals  their own weight. Additionally, the air contained in the spaces of the ship inside is much less dense than density of water aiding in the floating process.

Answer:

368m

Explanation:

dx=vt

54+38/2=46

46*8=368m

Answer:

35

Explanation:

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A) If the box moves at a constant velocity, what we know about the forces acting on the object is; the sum of the forces acting on the object must be zero.

B) If the box moves at a constant velocity, the force that opposes the motion of the box is; Frictional Force of -20 N

C) If the box experiences a force of 15 N to the left, along with the 20 N force acting to the right, the net force on the box is; F_net = 5 N

We are told that a box is being pulled across a horizontal surface by a 20N force to the right.

        In this case the opposing force will have to be the frictional force which will be -20 N to balance out the applied force.

Thus, the net force will be;

F_net = 20 - 15

F_net = 5 N

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Answer:

Drag increases with the density of the fluid (ρ). More density means more mass, which means more inertia, which means more resistance to getting out of the way. The two quantities are directly proportional.

Let's calculate the equivalent resistances on both circuits.

On Diagram A we have a series connection of the resistors. The equivalent resistance will be the sum of all resistances:

[tex]R_{eq}=1+1+1\\\\\boxed{R_{eq}=3\Omega}[/tex]

On diagram B we have a parallel connection of the resistors. The reciprocal of the equivalent resistance will be the sum of the reciprocals of all the resistances:

[tex]\frac{1}{R_{eq}} = \frac{1}{1} +\frac{1}{1} +\frac{1}{1} \\\frac{1}{R_{eq}}=3\\\\\boxed{R_{eq}=\frac{1}{3}}[/tex]

Therefore, the larger resistance occurs on diagram A.

For the current, recall

[tex]V=IR[/tex]

Where [tex]I[/tex] stands for current [tex]R[/tex] is the resistance and [tex]V[/tex] is the voltage. Rearranging the equation we have

[tex]I = \frac{V}{R}[/tex]

We can see that the larger the resistance, the smaller the current gets. So the larger current must happen in the diagram with smaller resistance. Therefore, the larger current occurs on diagram B.

Glad to help, wish you great studies ;)

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