HELP!!!!!!!!!
A toy car has a motor capable of moving the car at 10m/s up a 35 degree ramp. If the motor exerts a force of 500N to the car, what is the power rating of the motor in kW?

Answer:177.87

Explanation:

Answer:

P=I²R

Explanation:

P=2*10^-3 square times 10

4 times ten raise to power minus 5

Answer:

A) As her parachute opens, her acceleration is upwards.

Explanation:

The acceleration is the rate of change of the velocity.

Thus, if you have positive velocity and positive acceleration, your velocity increases

If you have positive velocity and negative acceleration, then your velocity decreases.

(The opposite happens when you have negative velocity).

Now, when the skydiver is falling, her velocity is downwards.

When she opens her parachute, her velocity downwards decreases.

This means that when she opens her parachute, she will have an acceleration in the opposite direction to her velocity, then at this point her acceleration is upwards.

We can conclude that the correct option is:

A) As her parachute opens, her acceleration is upwards.

Answer:

a) El piñón debe tener 20 dientes.

b) La bicicleta avanza aproximadamente 1,759 metros por cada pedaleada completa.

Explanation:

a) El plato es el engranaje más grande que forma parte del sistema de transmisión, acompañando a la cadena y el piñón integrado a la rueda trasera. Asumiendo que no existen pérdidas por fricción seca y que las condiciones de lubricación del sistema de transmisión son óptimas tal que las pérdidas de potencia son despreciables. Además, supongamos que la bicicleta viaja a velocidad constante, entonces tenemos la siguiente identidad mediante las definiciones de trabajo y potencia:

[tex]T_{P}\cdot \omega_{P} = T_{p}\cdot \omega_{p}[/tex] (1)

Donde:

[tex]T_{P}[/tex] - Torque del plato, en newton-metros.

[tex]T_{p}[/tex] - Torque del piñón, en newton-metros.

[tex]\omega_{p}[/tex] - Rapidez angular del piñón, en radianes por segundo.

[tex]\omega_{P}[/tex] - Rapidez angular del plato, en radianes por segundo.

Sabiendo el hecho que tanto el plato y el piñón experimenta la misma velocidad tangencial, podemos simplificar (1) como sigue:

[tex]\frac{T_{P}}{R_{P}} = \frac{T_{p}}{R_{p}}[/tex] (1b)

Puesto que el radio de cada elemento y el número de dientes son, por separado, directamente proporcionales al número de dientes, modificamos (1b) así y tenemos la siguiente identidad, la cual equivale a su vez a la razón de desarrollo:

[tex]\frac{T_{P}}{T_{p}} = \frac{N_{P}}{N_{p}} = \frac{R_{P}}{R_{p}} = \frac{\omega_{p}}{\omega_{P}}[/tex] (1c)

Donde:

[tex]N_{p}[/tex] - Número de dientes del piñón, sin unidad.

[tex]N_{P}[/tex] - Número de dientes del plato, sin unidad.

Si tenemos que [tex]r = 1,4[/tex] y [tex]N_{P} = 28[/tex], entonces tenemos que el número de dientes del piñón es:

[tex]r = \frac{N_{P}}{N_{p}}[/tex]

[tex]N_{p} = \frac{N_{P}}{r}[/tex]

[tex]N_{p} = \frac{28}{1,4}[/tex]

[tex]N_{p} = 20[/tex]

El piñón debe tener 20 dientes.

b) De acuerdo con la relación de desarrollo, por cada revolución realizada por el plato, el piñón realiza 1,4 revoluciones. Entonces, el avance realizado por la rueda trasera ([tex]s[/tex]), en metros, es igual al productor de la relación de desarrollo y la circunferencia de la rueda, es decir:

[tex]s = r\cdot 2\pi\cdot R[/tex] (1)

Donde [tex]R[/tex] es el radio de la rueda trasera, en metros.

Si conocemos que [tex]r = 1,4[/tex] y [tex]R = 0,2\,m[/tex], entonces el avance realizado por la rueda trasera es:

[tex]s = r\cdot 2\pi\cdot R[/tex]

[tex]s = (1,4)\cdot (2\pi)\cdot (0,2\,m)[/tex]

[tex]s \approx 1,759 \,m[/tex]

La bicicleta avanza aproximadamente 1,759 metros por cada pedaleada completa.

Answer: Pa=Pv

Explanation:

Khan academy

Amos runs up a flight of stairs with a total change in energy ΔEA. Vanessa exerts double the amount of energy in twice the time.

How does Amos’s power output, PA, compare with Vanessa’s power output, Pv?

Answer: Pa=Pv

Answer:

the answer is c

Explanation:

i did the test

Answer:

1500kg

Explanation:

Initial velocity(u)=0m/s

Final velocity(v)=20m/s

Time taken=5s

Acceleration=v-u/t

Acceleration=20-0/5=4m/s^2

Force=6000N

Mass=?

Mass=Force/acceleration

= 6000/4

=1500kg

Answer: C is correct :)

Explanation:

Answer:A

Explanation:

The wavelength of the sound wave will be 3 meters.

The wavelength of any wave is defined as the distance between two max adjacent amplitudes, or the distance between two successive troughs or crest.

Now it is given that:

Distance =9 meters

time = 3 seconds

pitch=1/3 seconds

The velocity of  the sound will be

[tex]V=\dfrac{d}{t}=\dfrac{9}{3}=3\ \frac{m}{s}[/tex]

Now from the question the wavelength of the sound wave if the velocity of the wave remains constant but the pitch is tripled

so  [tex]f=3\times \dfrac{1}{3}=1 herts[/tex]

Now the velocity of the sound will be

[tex]v=f\times \lambda[/tex]

[tex]\lambda=\dfrac{v}{f}=\dfrac{3}{1}=3\ m[/tex]

Thus the wavelength of the sound wave will be 3 meters.

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Answer: Earthquakes and Volcanic eruptions

Explanation:

You did not attach a picture however, this should be the correct answer.

Mid-oceanic ridge plate  boundaries such as the Mid-Atlantic Ridge form as a result of plate separating at the boundary. This leads to earthquakes due to the forces of tension acting on the plates.

When this happens, the mantle is exposed and therefore there will be volcanic eruptions as the lava comes to the surface as magma. When this magma cools it creates new seafloors and underwater mountains.

What are the following statements?

Answer:

immma send you the link friend me on hereExplanation:

Answer: 0.5A

Explanation:

According to Ohm's law, the Voltage(V) when a current flows through a resistor can be calculated by using the formula:

V = IR

where,

V = Voltage = 200V

I = current in amps (A)

R = resistance in ohms (Ω) = 400Ω

Current = Voltage / Resistance

I = V/R

I = 200/400

I = 0.5A

Therefore, the current is 0.5 Ampere

hope it is helpful to you

Answer:

option one

Explanation:

equilibrium is used to describe the point in which something meets in this case the temperature of an object

Answer:

a. t = 2 s

b. vf = 20 m/s

Explanation:

a.

We can the second equation of motion to find out the time to reach the ground:

[tex]h = v_it + \frac{1}{2}at^2[/tex]

where,

h = height = 20 m

vi = initial velocity = 0 m/s

t = time taken to reach the ground = ?

a = acceleration = 10 m/s²

Therefore,

[tex]20\ m = (0\ m/s)t+\frac{1}{2} (10\ m/s^2)t^2\\\\t^2 = \frac{20\ m}{5\ m/s^2}\\\\t = \sqrt{4\ s^2}[/tex]

t = 2 s

b.

Here, we will use the first equation of motion to find the final speed:

[tex]v_f = v_i + at\\v_f = 0\ m/s + (10\ m/s^2)(2\ s)[/tex]

vf = 20 m/s

Answer:

Density = 0.243 g/cm³

Explanation:

Volume of cork = 23.5 cm³

Mass = 5.7 g

To find the density of the cork;

Density can be defined as mass all over the volume of an object.

Simply stated, density is mass per unit volume of an object.

Mathematically, density is given by the formula;

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

Substituting into the formula, we have;

Density = 5.7/23.5

Density = 0.243 g/cm³

Answer:

B

Explanation:

First narrow answers to CIRCULAR motion.

Only A and B have circular motion.

Second look at the keyword UNIFORM. A swing does not have uniform motion because it will accelerate due to gravity and have the most velocity at the bottom of the swing.

Therefore, it must be B.

Answer:

Force = 11.33 Newton

Explanation:

Given the following data;

Impulse = 34 Ns

Time = 3 seconds

To find the force acting on the object;

Impulse = force * time

Substituting into the formula, we have;

34 = force * 3

Force = 34/3

Force = 11.33 Newton

Note: the impulse of an object is equal to the change in momentum experienced by the object.

Answer:

The slope of a velocity graph represents the acceleration of the object. So, the value of the slope at a particular time represents the acceleration of the object at that instant.

Answer:

The slope of a velocity graph represents the acceleration of the object.

Explanation:

So, the value of the slope at a particular time represents the acceleration of the object at that instant.

Answer:

Milk Lactometer

Milk Lactometer: A lactometer is an instrument that is used to check for the purity of milk by measuring its density.

lactometer is used to determine the purity of milk

hope it is helpful to you

Answer:

960W

Explanation:

v=R×I

v=60ohm.4A=240v

p=VI

p=240v.4A

p=960W

The power of a hair dryer with a current of 4 A and a resistance of 60 ohms is 960 W.

The amount of work completed in a given amount of time. Watt (W), which is derived from joules per second (J/s), is the SI unit of power. Horsepower (hp), which is roughly equivalent to 745.7 watts, is a unit of measurement sometimes used to describe the power of motor vehicles and other devices.

Given in the question a hair dryer with a current of 4 A and a resistance of 60 ohms power, p

Voltage, v=R×I

v=60 ohm.4 A=240 v

power, p=VI

p=240 v.4 A

p=960 W

The power of a hair dryer with a current of 4 A and a resistance of 60 ohms is 960 W.

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Answer:

A light wave travels through the vacuum of space

Explanation:

A light wave cannot be a matter wave because a matter wave is made up of

atoms while light wave is a form of radiation (electromagnetic). A matter wave requires a medium to travel while a light wave do not require medium to travel. Since light wave is a form of radiation, light can travel in vacuum.

Hence, the correct answer is A light wave travels through the vacuum of space

Answer:

The voltage across light bulb 1 and light bulb 2 is the the same i.e V

Explanation:

In a parallel circuit, the Voltage is same across all the components of the circuit and the current flowing through each component is added to get the total current across the circuit.

Let us say, the voltage across the circuit is V. The voltage across light bulb 1 and light bulb 2 is the the same i.e V

Answer:

As global population a.) increases food production must a.) increase.

Example:

More people means more food must be produced.

Answer:

A

Explanation:

The Reaction rate is going down which is why its at 0 And the concetration line is going up which means increasing,