A train travels with a constant speed of 36 miles per hour. How far can it travel in 1 hour 30 minutes?

Answers

Answer 1

Answer:

Answer: 54 miles in 1hr 30min

Explanation:

The train travels at a constant speed of 36 miles per hour. To find out how far it can travel in 1 hour 30 minutes, we need to convert the time to hours. Since there are 60 minutes in 1 hour, 1 hour 30 minutes is equal to 1.5 hours (1 hour + 30 minutes/60 minutes). To calculate the distance traveled, we multiply the speed of the train (36 miles per hour) by the time it travels (1.5 hours). So, the train can travel 36 miles per hour * 1.5 hours = 54 miles in 1 hour 30 minutes. Therefore, the train can travel a distance of 54 miles in 1 hour 30 minutes

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4 points Two cylindrical resistors R, and R2 made from the same material are connected in parallel in a circuit. Both resistors are at the same temperature when the circuit is operational. Resistor R, has length and diameter d. Resistor R has length 8l and has a diameter d/1. Determine by what factor is the resistance R greater than R.St. your answer as an integer with no decimal place. Type your answer...

Answers

To determine the factor by which the resistance of resistor R2 is greater than resistor R1, we can use the formula for resistance of a cylindrical resistor:

R = ρ * (L/A)

Where R is the resistance, ρ is the resistivity of the material, L is the length of the resistor, and A is the cross-sectional area of the resistor.

Since both resistors are made from the same material and are at the same temperature, the resistivity ρ is the same for both resistors.

Let's calculate the resistance for R1 and R2 separately.

For resistor R1 (length = L and diameter = d), the cross-sectional area A1 is given by:

A1 = π * (d/2)^2

For resistor R2 (length = 8L and diameter = d/1), the cross-sectional area A2 is given by:

A2 = π * ((d/1)/2)^2

Simplifying the equations:

A1 = π * (d/2)^2 = π * (d^2/4)

A2 = π * ((d/1)/2)^2 = π * (d^2/4)

As we can see, both resistors have the same cross-sectional area A.

Now, let's calculate the resistance for R1 and R2:

R1 = ρ * (L/A1) = ρ * (L / (π * (d^2/4)))

R2 = ρ * (8L/A2) = ρ * (8L / (π * (d^2/4)))

Simplifying the equations further:

R1 = (4ρL) / (πd^2)

R2 = (32ρL) / (πd^2)

Now, let's find the factor by which the resistance R2 is greater than R1:

Factor = R2 / R1 = ((32ρL) / (πd^2)) / ((4ρL) / (πd^2))

Canceling out common terms:

Factor = (32ρL * πd^2) / (4ρL * πd^2)

Factor = 32 / 4

Factor = 8

Therefore, the resistance R2 is 8 times greater than the resistance R1.

The resistance of second resistor R2, is 16 times greater than the resistance of the first resistor R1.

The resistance of a cylindrical resistor is given by R = ρL/A, where ρ is the resistivity, L is the length, and A is the cross-sectional area (which is πd²/4 for a cylinder). For R1, it has length L and diameter d. For R2, it has length 8L and diameter d/1. The resistance of R2 is therefore:

R2 = ρ(8L)/(π(d/1)²/4)

By comparing R2 to R1, we find that R2 is 16 times the resistance of R1.

The resistance of second resistor R2, is 16 times greater than the resistance of the first resistor R1.

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When alvin woke up in the morning it was -9 degrees by the morning it was -2 degrees what is the change in temperatures

Answers

The change in temperature from -9 degrees to -2 degrees is 7 degrees.

Final answer:

The change in temperature from -9 degrees to -2 degrees is a rise of 7 degrees.

Explanation:

The change in temperature is calculated by subtracting the initial temperature from the final temperature. In this case, Alvin woke up to a temperature of -9 degrees. By end of the morning, the temperature had risen to -2 degrees. So, to find out the change in temperature, subtract the initial temperature from the final temperature, which is -2 - (-9), this equals to 7 degrees.

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When the resultant force acting on a system is zero, the total momentum of the system...

Answers

When the resultant force acting on a system is zero, the total momentum of the system remains constant. This is known as the principle of conservation of momentum. In other words, if the net external force acting on a closed system is zero, the total momentum of that system will not change over time. This principle is commonly applied in physics, particularly in scenarios involving collisions and interactions between objects.

How does the electric potential energy between two charged particles change if one particle's charge is increased by a factor of 2?

Answers

Answer:

Magnitude of potential energy is increased by factor "2"

Explanation:

As we know that if two charge particles are placed at some distance "r" from each other then the electrostatic potential energy between two charge particles is given as

$U = (kq_1q_2)/(r)$

now we know that if the charge of one of the charge particle is increased to twice of initial charge then

$U' = (kq_1(2q_2))/(r)$

now we can say from above two equations that

$U' = 2U$

so on increase one of the charge to twice of initial value then the potential energy will become TWICE

from the formula of electric potential = (1/4πe)*(Qq/r), if one of the charge is doubled, the electric potential energy would be doubled too. Not so sure though, u might wanna double-check with someone else. But hope that helps. :)

If it takes 726 W of power to move a mass 36 m and 14 seconds what is the mass

Answers

From that information, I can tell that the force pushing on the mass
averaged (282 and 1/3) newtons during those 24 seconds.

But the information doesn't nail down what the mass must be.
I think it would if we only knew something about the friction.
Either tell us how much friction there is, or tell us that there's
none, and I think I could find the mass.

power = work / time
work = force * displacement
force = mass * gravity

so:

power = (mass * gravity * displacement) / time
726 = (mass * 9.81 * 36 ) / 14
726 * 14 = mass * 9.81 * 36
10164 = mass * 353.16
mass = 10164 / 353.16

mass = 28.78 kg

Which device is using a motor?A water heater creates heat energy from electric energy.

A waterfall rotates a waterwheel to turn an axle.

A body massager uses electric energy to move back and forth.

A solar charger creates electric energy from the Sun.

Answers

Out of all the options, only body massager which uses electric energy to move back and forth is using motor here. It is because a motor converts electrical energy to Mechanical energy and only massager obeys it among all the options.

In short, Your Answer would be Option C

Hope this helps!

Answer: C.

A body massager uses electric energy to move back and forth.

Explanation:

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