help please! This question is driving me crazy

Answer:

The gravitational force between Saturn and it's moon is 1.62 m/s ^2

Explanation:

google it

Answer:

Explanation:

C bro

Answer:

The shorter train has a length of 600m

Explanation:

The equation of motion of the first train can be written as:

[tex]x'=v't[/tex]  (1)

v' = 108km/h = 30m/s

Furthermore, you can write the equation of motion of the second train as:

[tex]x=(200+l)+vt[/tex]  = xo + vt  (2)

v = 36km/h = 10m/s

where you have taken the initial position as measured from the front of the first train to the front of the second one. l is the length of the second train and 200 the separation of it respect to the first train.

For t = 40 both trains have the same position, that is, x=x'. Then, you equal equations (1) and (2), replace t=40, and solve the equation for l:

[tex]x'=x\\\\v't=200+l+vt\\\\(30m/s)(40s)=200+l+(10m/s)(40s)\\\\l=600m[/tex]

Hence, the first train has a length of 600 m

The train behind, or the second train, has twice the length of the first train:

[tex]l'=2l=2(600m)=1200m[/tex]

The shorter train has a length of 600m

Answer: The equilibrium temperature of brick and water is 2.82 Kelvin

Explanation:

Initial Temperature Ø of the brick = 285 degree Celsius

Initial temperature of ice = - 5 degree Celsius

Mass of iron = 1.3kg

Specific heat capacity c of iron = 448J/kg

In thermal experiments,

Heat lost = heat gain.

Let's first calculate the heat lost

The brick will loose heat.

H =mcØ

Heat lost = 1.3 × 448 × (285 - T)

Heat lost = 582.4( 285 - T )

Now let's calculate for heat gain

Heat gain = mcØ + mcØ + mcØ

Heat gain = [(2.6×2090) + (2.6×4186) + (2.6×1970)](T - -5)

Heat gain = 5434 + 10883.6 + 5122(T+5)

Heat gain = 21439.6( T + 5)

Equating the heat lost and the heat gain leads to

582.4( 285 - T) = 21439.6(T+5)

Open both bracket

165984 - 582.4T = 21439.6T + 107198

Collect the like terms

21439.6T - 582.4T = 165984 - 107198

20857.2T = 58786

T = 58786/20857.2

T = 2.82 Kelvins

The equilibrium temperature of brick and water is 2.82 Kelvin

Answer:

It slows it down.

Explanation:

Higher the velocity, higher the friction. Friction is the force OPPOSITE to whatever the force is going.

Answer:

The magnitude of the magnetic field created is 5 x 10⁻⁷ T

Explanation:

Given;

magnitude of current, I = 10.0 A

distance of the magnetic field, r = 4.0m

Apply Biot-Savart Law to determine the magnitude of of the magnetic field created;

[tex]B = \frac{\mu_oI}{2 \pi r}[/tex]

where;

B is the magnitude of of the magnetic field

μ₀ is constant

I is current

r is the distance of the field

[tex]B = \frac{4 \pi*10^{-7} *10}{2 \pi*4} = 5*10^{-7} \ T[/tex]

Therefore, the magnitude of the magnetic field created is 5 x 10⁻⁷ T

Answer:

C

Explanation:

The temperature of an object does not change when it is going through a phase change, since there is a single specific point on the temperature gradient where that change occurs. Once the phase change has occurred, the water's temperature can continue to change in that direction, but during the phase change it does not. Hope this helps!

Answer: The answer is C

Explanation:

Hope it helps :)

Answer:

Both particle and wave properties

Explanation:

Light is defined as a particle and a wave, and even as a combination of a particle and a wave. A unit of light is the photon. Higher energy photons behave like particles and low energy photons behave like waves.

Experiments performed with light indicate that light exhibits both particle and wave properties.

Answer:

Explanation:

Using the ideal gas equation as shown

PV = nRT where;

P is the pressure of the gas in ATM

V is the volume of the gas

n is the number of moles

R is the ideal gas constant

T is the temperature in Kelvin

From the formula, [tex]T = \frac{PV}{nR}[/tex]

Given the following parameters V = 1litre, n = 0.5moles. pressure = 2ATM

R = 0.08206 atm L/molK

On substituting to get the temperature we have:

[tex]T = \frac{2*1}{0.08206*0.5} \\T = \frac{2}{0.04103}\\T = 48.75Kelvin[/tex]

Answer:

The energy source which can cause the turbine (wooden wheel) to spin and generate electrical energy is hydro-energy source.

Explanation:

The energy source which can cause the turbine (wooden wheel) to spin and generate electrical energy is hydro-energy source. Hydro energy source, is the energy source gotten from the force of falling water.

Hydro energy causes the turbine to spin converting it mechanical energy and finally to electrical energy using a generator.

Force of falling water (hydro-energy source) ------>spinning of turbine (mechanical energy) ---------------> electrical energy

Answer:

The ratio of the potential difference across a metallic conductor to the current in the conductor is known as.

B. Resistance.

Explanation:

According to ohms law   " the current  passing through a conductor is directly proportional to the potential difference between the ends provided the temperature of the wire remains constant".

What is resistance ?

Resistance is a measure of the opposition to current flow in an electrical circuit

what is a resistor ?

a resistor is a n electric conductor which forms resistance to free flow of electric current, the resistance is measured in Ω

The ratio of the potential difference across the conductor to the current is called resistance

It is defined as the ratio of the potential difference across the conductor to the current. The resistance is measured in Ω.

[tex]R = \dfrac VI[/tex]

Where,

[tex]R[/tex] - resistance

[tex]V[/tex]- voltage (Potential difference)

[tex]I[/tex] - current

Therefore, the ratio of the potential difference across the conductor to the current is called resistance.

To know more about resistance.

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Answer:

multiply 65kg and 3m/s^2

to get 195kgm/s

or 195N

wait is that 3m/s or 3m/s^2?

Answer: When the worker is on the top rung

Explanation: When the ladder was initially resting on the wall, the torque from the normal reaction on ladder from the horizontal surface is equal to the torque from the vertical surface on ladder.

The weight of the worker produces a torque which is in the direction of the torque from the normal reaction on ladder, produced by the vertical surface. Therefore for the ladder to stay in rotational equilibrium, the torque on ladder from the normal reaction produced by the horizontal surface must increase.

This increase is possible when the worker is on the lower rung, but as the worker goes high, the magnitude of normal reaction from the vertical surface would increase, thereby increasing the risk of slipping of ladder.

So the right answer is 4kg/m^3.

Look at the attached picture

Hope it will help you

Good luck on your assignment

Answer:

The answer is option 4.

Explanation:

Firstly, you have to convert the mass of tea bagto kilogram as the question wants the unit in kg/m³.

[tex]1000g = 1kg[/tex]

[tex]100g = 1kg \div 10[/tex]

[tex]100g = 0.1kg[/tex]

So the mass of tea bag is 0.1 kg. Next you have to use density formula ρ = mass/volume. Then you have to substitute the values into the formula :

[tex]ρ = \frac{mass}{volume} [/tex]

Let mass = 0.1kg,

Let volume = 0.025m³,

[tex]ρ = \frac{0.1}{0.025} [/tex]

[tex]ρ = 4kg \: per \: {m}^{3} [/tex]

Answer:

The answer is 1/16

Explanation:

1. Persistence of vision refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye. 2. The persistence of vision for normal eye is 1/16 if a second.

Answer:

The Sun derives all its energy from a fusion cycle. In that process, tiny hydrogen molecules combine into a continuous proton-proton chain to create larger helium nuclei. The above figure illustrates the fusion of hydrogen into helium.

Explanation:

Hope this helps.

Answer:

nuclear fusion

Explanation:

In this process, small hydrogen molecules fuse together to form bigger helium nuclei in a continuous proton-proton chain.

Answer: its low

Explanation:

Answer:

Magnetic field

Explanation:

Answer:

magnetic field

Explanation:

Explanation:

1) reduction in current

2)less no. of coils per unit length

3) removal of soft iron core

Answer:

The total distance to be covered by the athletes is 800 m

The displacement of the athletes when they touch the finish line is zero.

Explanation:

Given;

Length of the track, L = 200m

the Length of the track for a single round = 200 m

(a) Distance is a scalar quantity which has only magnitude;

If the athletes were expected to take four rounds of the track, then the total distance = 4 x 200 m = 800 m

(b) Also, if  the line of finish was same as the line of start, then displacement of the athletes when they touch the finish line is zero (0 meters). This is because displacement has both magnitude and direction. Once the athlete returns to his starting point, his displacement at that point is zero.

Answer:

Because even if iron is magnetic its not a magnet it self unless rubbed a magnetic object

Answer: Distance

I’m not sure if it is correct, but I am pretty sure it is......

I hope this helps :)

Answer:

The magnetic field is   [tex]B = 3 mT[/tex]

Explanation:

From the question we are told that

     The inner radius is  [tex]r_i = 1.00 mm =1*10^{-3} \ m[/tex]

      The outer radius is  [tex]r_2 = 3.00 \ mm = 3.0 *10^{-3} \ m[/tex]

       The distance from the axis of the conductor is [tex]d =2.0 \ mm = 2.0 *10^{-3} \ m[/tex]

      The current carried by the conductor is  [tex]I = 80 A[/tex]

According to Ampere's circuital law , the magnetic field at a point that is  [tex]r_3[/tex]  from the axis of the conductor

                  [tex]B = \frac{\mu_oI}{2 \pi d } [\frac{d - r_1}{r_2 -r_1} ][/tex]

Where [tex]\mu_o[/tex] is the permeability of free space with a value of [tex]\mu_o = 4 \pi *10^{-7} N/A^2[/tex]

substituting values

                  [tex]B = \frac{(4 \pi *10^{-7})(80)}{2 * 3.142 * 2 *10^{=3} } [\frac{(2^2 - 1 ^2 )*10^{-3}}{(3^2 - 1^2) *10^{-3}} ][/tex]

                 [tex]B = 3 mT[/tex]

Answer:

6.81 x 10^-4

Explanation:

Answer:

9.01amp

Explanation:

Power = V^2/R

Given that v = 11volts, P = 99watts

99 = 11^2/R

11×11 = 99R

121= 99R

R = 121/99

R= 1.22ohms

From ohms Law; V = IR

11volts = I × 1.22ohms

I = 11/1.23

I = 9.01 amp

Answer:

acc. also gets increased four times

Answer:

Explanation:

When the charge of a circuit reaches the capacitor, all charge is distributed in the surface of the capacitor in order to create an electric field. The opposite of this charge is also in the capacitor, but separated.

When the capacitor receive more charges, its stability changes. Thus, the charge in one of the plates of the capacitor demands that charge on the other plate move out of the capacitor to equilibrate the charge. Thus, the current in the circuit is not interrupted.

Answer:

It gets stored somewhere in the capacitor

Explanation:

I got it right

Answer:

3) Wave speed is directly related to the product of wavelength and frequency.

4) Frequency has a direct relationship to wavelength when speed remains constant

Explanation:

V is the velocity (wave speed)

f is the frequency

the symbol next to the frequency is the wavelength

Velocity is proportional because the wavelength and frequency are multiplying.

It would be inversely proportional when the velocity is the dividend of the wavelength and frequency.

On the second statement, frequency (and wavelength) are directly related/proportional to the speed of the wave.

The first two choices are both false, but the second one is the falser one.

All electricity sources do not have the same voltage. The outlet in your bedroom wall supplies 120 volts, but the USB port on your laptop only supplies 5 volts, and the battery in your cellphone only supplies 3.7 volts.

All electricity sources have the same voltage isn't true

All electricity sources usually have different voltage as the number of

electrons needed to power them varies. For example heating appliances

usually have a higher amount of voltage as it requires more electrons to

increase the temperature.

The higher the amount of voltage , the higher the amount of electrons which collides more and translates to faster current  which is correct.

Voltage is also known as the difference in electrical potential energy and the unit for voltage is Volt (V).

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Answer:

I = 0.75 A

Explanation:

The question is not to calculate the resistance, but to calculate the current. (The resistance is already given by the value of 2 Ohm).

U = I * R

I = U / R

with U = 1.5 V and R = 2 Ohm

I = 1.5 / 2

I = 0.75 A