Consider the following scenario. A car for which friction is not negligible accelerates from rest down a hill, running out of gasoline after a short distance (see below). The driver lets the car coast farther down the hill, then up and over a small crest. He then coasts down that hill into a gas station, where he brakes to a stop and fills the tank with gasoline. Identify the forms of energy the car has, and how they are changed and transferred in this series of events.

Answer:5,880

Explanation:Lol if I get this wrong sorry I’m trying to do this also but if you add the 1,764 joules and 4,116 joules in total if you add them all up it’ll give you 5,880 hope that helps.

Correct question is;

In an RC parallel circuit, Et = 480 V, R = 50kΩ, and XC = 47 kΩ. What is the reactive power?

Answer:

P_r = 4.9 VARs

Explanation:

We are given;

Total voltage: Et = 480 V

Resistance; R = 50kΩ = 50000 Ω

Capacitive reactance; XC = 47 kΩ = 47000 Ω

Formula for current across the capacitor is;

Et = I_c • XC

I_c = Et/XC

l_c = 480/47000

I_c = 0.01021 A

Formula for reactive power is;

P_r = (I_c)² × XC

P_r = 0.01021² × 47000

P_r = 4.9 VARs

Answer:

i think its D

Explanation:

Based on the table and your knowledge of sound, the best explanation of why sound travels faster in saltwater than fresh water is that salt water is more resistant to compression which is why it travels through it faster.

This is referred to as a disturbance in a medium that carries energy without a net movement of particles.

Unlike normal water, saltwater has a greater density because of its molecular arrangement . Thus, sound waves travel faster underwater as the wave bumps through and vibrates with more molecules thereby making it the reason why it was chosen as the correct choice.

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Given the force applied, the magnitude of the force of friction acting on the mass is 2.5 Newton

Given the data in the question;

To determine the magnitude of the force of friction acting on the mass,

From Newton's laws of motion

\(F = m\ *\ a\)

Where F is the force applied, m is the mass of the object and a is the acceleration of the object.

Now, we know that Kinetic Friction is always opposite of the direction of motion.

So, in the question, the force applied overcomes the friction to produce an acceleration of \(1.5 m/s^2\)

Hence

\(F = F_k + ma\)

Where \(F_k\) is the kinetic friction

Now, we substitute our given values into the equation

\(10N = F_k +\ ( 5kg\ *\ 1.5m/s^2)\\\\10N = F_k +\ 7.5kg.m/s^2\)

We know that, A newton is defined as \(1 kg.m/s^2\)

Hence;

\(10N = F_k\ *\ 7.5N\\\\F_k = 10N \ -\ 7.5N\\\\F_k = 2.5N\)

Therefore, given the force applied, the magnitude of the force of friction acting on the mass is 2.5 Newton.

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Objects 1 and 2 attract each other with an electrostatic force of 36.0 units. If the distance separating Objects 1 and 2 is tripled, then the new electrostatic force will be four units.

Coulomb's law can be expressed as:

F = k × (q1 × q2) / r²

In which:

F = electrostatic force

k = electrostatic constant (k = 9 × 10⁹ N·m²/C²)

q1 and q2 = the charges of the objects

r =  distance between the objects

Let's consider that the initial electrostatic force in between objects 1 and 2 is 36.0 units.

F1 = 36.0 units

Next, if the distance is considered between the objects is tripled, the new distance (r') changes into three times the initial distance (r):

r' = 3 ×  r

To determine the new electrostatic force (F'), replacement r' into Coulomb's law:

F' = k  × (q1  × q2) / (r')²

Place r' = 3r:

F' = k × (q1 × q2) / (3r)²

= k × (q1 × q2) / 9r²

The new force will be one-ninth (1/9) of the initial force since the electrostatic force (F') is directly proportional to (q1 q2) and inversely proportional to r2.

F' = (1/9) ×  F1

= (1/9) × 36.0

= 4.0 units

Thus, objects 1 and 2 attract each other with an electrostatic force of 36.0 units. If the distance separating Objects 1 and 2 is tripled, then the new electrostatic force will be 4 units.

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Answer:

\(\boxed{12250N}\)

Explanation:

Assuming we disregard air resistance, the only force acting on the elevator will be its weight.

\(F \implies w=m\cdot g\)

where:

\(F=\) force

\(w=\) weight

\(m=\) mass → 1250kg

\(g=\) gravity acceleration  → 9.8m/s^2

Then:

\(F= 1250kg \cdot 9.8m/s^2\\F=12250 kg\cdot m/s^2= 12250N\)

Hope it helps.

\(\text{-B$\mathfrak{randon}$VN}\)

Explanation:

It is given that,

A nearsighted woman has a far point of 180 cm.

The object distance for nearsightedness is infinity, u = ∞

The image distance is, v = -180 cm

Using lens formula,

\(\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}\\\\\dfrac{1}{f}=\dfrac{1}{(-180)}-\dfrac{1}{\infty}\\\\f=-180\ cm\\\\f=-1.8\ m\)

For nearsightedness, a diverging lens is used.

Power of the lens,

P = 1/f

\(P=\dfrac{1}{-1.8}\\\\P=-0.56\ D\)

So, the power of the lens is -0.56 D.

The power of lens to be prescribed is 3.5 D.

A person that is far sighted can see far objects clearly but not nearby objects. The farpoint of a normal eye is infinity. Far sightedness is corrected by the use of a convex lens. The near point of the normal eye is 25 cm.

We have that;

u = 25 cm

v = -180 cm

1/f = 1/u - 1/v

1/f = 1/25 - 1/180

1/f = 0.04 - 0.0056

f = 29 cm

Power of lens = 100/f = 100/29 = 3.5 D

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Answer:

B

Explanation:

The answer to this is B because nitrogen gas is N2 and they are chemically bonded not simply mixed.

The density of water is approximately 1 g/cm^3. Therefore, the volume of 2800 g of water would be 2800 cm^3 because density is mass/volume, and so volume is mass/density.

Since this volume is inside a cubic box, the length of each side of the cube (a, for instance) could be found by taking the cubic root of the volume. This is because the volume of a cube is calculated by a^3 (length of one side cubed). Hence, a = cube root of 2800 cm^3 ≈ 14.1 cm.

Converting centimeters to meters (as 1 meter is equal to 100 centimeters), we get approximately 0.141 meters.

So the filled cubic box has a side length of approximately 0.141 m.

Answer:

Explanation:

Just use the Force formula.

F = M . A

Acceleration Formula

A = V - Vo / Time

So...

F = 845 . (30 - 2 / 0.9)

F = 845 . 20

F = 16900 N

Answer:

google answers, i'm not 100% on how to type my own answer

Explanation:

Thaw food submerged under running water at a temperature of 70˚F (21˚C) or lower. The water flow must be strong enough to wash food particles into the overflow drain. In a microwave oven. You can safely thaw food in a microwave oven if the food will be cooked immediately.

The reason defrosting in water is preferable is because water conducts heat better than air. And the faster food is thawed, the better it tastes.

Answer:

The reason defrosting in water is preferable is because water conducts heat better than air. And the faster food is thawed, the better it tastes.

Answer:

Given: V=12 V

            I=2.5 mA

Let the resistance be R

By Ohm's Law, 

V=IR

12=2.5×10−3R

R=4.8×103 Ω

Answer:

The central nervous system is generally made of brain and spinal cord.

Explanation:

Answer: Multiply the time by the acceleration due to gravity to find the velocity when the object hits the ground. If it takes 9.9 seconds for the object to hit the ground, its velocity is (1.01 s)*(9.8 m/s^2), or 9.9 m/s.

Explanation:

The magnitude of the final momentum of the purple marble is 5g

The law of conservation of momentum states that:

Total momentum before collision = Total momentum after collision

Let x represent the magnitude of the final momentum of the purple marble, therefore:

20 + 0(stationary) = 15 + x

x + 15 = 20

x = 5

The magnitude of the final momentum of the purple marble is 5g

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The magnetic field at the center of each turn of the toroid is 1.29 x 10⁻⁴ T.

Magnetic field is the region of space where the influence of a magnetic field is felt.

The magnetic field at the center of each turn of the toroid is calculated as follows;

B = μnI

where;

B = (4π x 10⁻⁷) x (1,800) x (0.057)

B = 1.29 x 10⁻⁴ T

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Answer:

a) When moving towards a high pressure center the pressure values ​​increase in the equipment

b) This area is called high prison since the weight of the atmosphere on top is maximum

Explanation:

A) A high atmospheric pressure system is an area where the pressure is increasing the maximum value is close to 107 Kpa, the other side as low pressure can have small values ​​85.5 kPa.

When moving towards a high pressure center the pressure values ​​increase in the equipment

B) This area is called high prison since the weight of the atmosphere on top is maximum

in general they are areas of good weather

ANSWER

\(31sqrt{2}\)

EXP

use  pythagouras theorum

The distance travelled by the vehicle around the circular track is 1,052.4 m.

The distance travelled by the vehicle in one complete cycle is calculated by using the following equation as show below.

d = 2πr

d = πd

Where;

In one complete cycle, the  vehicle will travel the circular track only once.

d = π(335 m)

d = 1,052.4 m

Thus, the distance travelled by the vehicle around the circular track is a function of the diameter of the circular track.

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The complete question is below:

A vehicle, starting from rest, accelerates on a circular track with a 335m diameter. What is the distance travelled by the vehicle when it makes one complete cycle?

The observation or phenomenon that is  said to be my experiment about is: The long time effect of plastic waste in the environment.

H0 = There is no long time effect of plastic waste in the environment.

Ha = There is a  long time effect of plastic waste in the environment.

Samples will be collected from places where there are different kinds of plastic waste. It will be done in several location. Soil and chemical analysis will be done and data will be extracted. The control will be an environment that has no plastic waste.

Data will be collected on some types of Plastics such as:

Therefore, The observation or phenomenon that is  said to be my experiment about is: The long time effect of plastic waste in the environment.

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Answer:

As a bat increases its forward speed, it should decrease the frequency of the emitted pulses to compensate.

decrease

Explanation:

Decreasing the frequency of the emitted pulse will help the bat reduce its frequency caused by its forward motion.  The forward motion shifts the bat's auditory frequency to a higher frequency; consequently, the bat should adjust downwards the frequency of the emitted pulse so the reflected pulse will be in the correct frequency range.

The ions are;

S^2- Gained 2 electrons

Li^+ - Lost one electron

Al^3+ - Lost 3 electrons

Cl^- gained one electron

Sr^2+ Lost two electrons

P^3- gained 3 electrons

As an atom or molecule acquires or loses one or more electrons, ions are created. Protons and neutrons make up the positively charged nucleus of an atom, which is encircled by negatively charged electrons. An atom typically has a neutral charge because the amount of electrons and protons in it equals one.

The balance between the negatively charged electrons and positively charged protons is upset when an atom receives or loses an electron, creating an ion with a positive or negative charge.

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Answer:

7000 meters

Explanation:

obviously 99.99 is less than 7000

10 cubed is 10 × 10 × 10, 1000, × 4.5 is 4500, which is less than 7000

10 squared is 100, which × 9 is only 900, which is also less than 7000

have a good day

The concept of time in space can be different from time on Earth due to the effects of time dilation. Time dilation occurs due to differences in gravitational fields and relative motion.

If we consider an astronaut who is in a relatively low-gravity environment and not traveling at a significant fraction of the speed of light, the time experienced by the astronaut in space would be very similar to the time experienced on Earth. In this scenario, one hour in space would be approximately the same as one hour on Earth.

However, if we consider extreme cases, such as an astronaut near a black hole or traveling at near-light speeds, time dilation effects would become significant. In these situations, the time experienced by the astronaut would be different from the time on Earth.

It's important to note that the magnitude of time dilation effects depend on the specific conditions and relative velocities involved. For most common space travel scenarios, the difference in time between space and Earth is negligible, and one hour in space would correspond to one hour on Earth.

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The average speed of the girl is 2.26 m/s.

The average speed is calculated by dividing the total distance traveled by the total time taken. In this case, the girl traveled a total distance of 120 m + 80 m = 200 m. She took a total time of 15 s + 12 s = 27 s to travel this distance.

Therefore, the average speed is:

average speed = total distance / total time

average speed = 200 m / 27 s

average speed = 2.26 m/s

The average speed does not take into account the direction of the motion. The girl traveled in two different directions, so the average speed is not a meaningful measure of her speed.

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