Problem I Marcella (see warmup problem, above) gets her car moving steadily at 4m/s but suddenly someone stops ahead to assist her and parks their car 14 meters from the front of her car. Marcella grabs the car bumper and pulls very hard, with 200 N of force. The work she does transfers energy out, it reduces the K of the car, as it gradually approaches the other car. a) What is the initial kinetic energy before she tries to stop the car? b) What is the final kinetic energy, when her car hits the other car? What is the speed? c) Suppose the other person also slowed her car, pushing it from the front. How much force would be needed to stop her car 1 meter from the other car? [1 m allows the person not to be crushed!]

As there is only one force acting on the ball i.e. gravitational force, the acceleration will be constant and downward. Also because ball moves in the direction of the acceleration, the velocity increases.

Acceleration - constant; velocity - increasing.

What is Acceleration?

Acceleration is the rate of change of velocity of an object over time. It can be positive, negative, or zero. Positive acceleration is when an object speeds up, negative acceleration is when an object slows down, and zero acceleration is when an object's velocity remains constant.

What is velocity?

Velocity is a measure of the speed and direction of an object's motion. It is typically measured in meters per second (m/s) or kilometers per hour (km/h). Velocity can also be expressed in other units, such as miles per hour (mph) or feet per second (ft/s). Velocity is related to a object's acceleration, as an object's acceleration is the rate of change in its velocity over time.

To know more about Acceleration,

https://brainly.com/question/460763

#SPJ4

\(\begin{align}Q &= \frac{kA\Delta T}{d} \ &= \frac{(0.02)(0.0315)(90 - 22)}{0.005} \ &= 237.6\ \text{W}\end{align}\)

This is the rate of heat transfer through the insulated cup. Note that this assumes that the heat transfer is steady and one-dimensional, which may not be strictly accurate in reality.

\(\begin{align}\huge\colorbox{black}{\textcolor{yellow}{I hope this helps !}}\end{align}\)

\(\begin{align}\colorbox{purple}{\textcolor{lime}{Please mark as brillinest !}}\end{align}\)

\(\textcolor{cyan}{\small\textit{If you have any further questions, feel free to ask!}}\)

Answer:

A) -40° C and -40° F

B) 574.25° K and 574.25° F

Explanation:

see attachment for calculation and explanation

The speed of the puck is 3.67 m/s.

To find the speed of the puck, we can use the concept of centripetal force. The tension in the string provides the necessary centripetal force to keep the puck moving in a circle. At the same time, the tension in the string also supports the weight of the suspended mass.

Using Newton's second law, we can write two equations of motion: one for the puck and one for the suspended mass. For the puck, the net force acting on it is the tension in the string, which is equal to the centripetal force required to keep it moving in a circle. Thus, we can write:

= m1 * v^2 / R

where T is the tension in the string, v is the speed of the puck, and R is the radius of the circle.

For the suspended mass, the net force acting on it is its weight minus the tension in the string, which must be zero since the mass is in equilibrium. Thus, we can write:

T = m2 * g

where g is the acceleration due to gravity.

Combining these two equations, we can solve for the speed of the puck:

v = sqrt(T * R / m1) = sqrt(m2 * g * R / m1)

Substituting the given values, we get:

v = sqrt(1.0 kg * 9.81 m/s^2 * 0.9 m / 0.21 kg) = 3.67 m/s

Therefore, the speed of the puck is 3.67 m/s.

for more such question on speed

https://brainly.com/question/30249508

#SPJ11

The net force on particle q₂, located between particles q₁ and q₃, is approximately 189000 N. The force exerted by particle q₁ on q₂ is positive and equals 252000 N, while the force exerted by particle q₃ on q₂ is negative and equals -63000 N.

To find the net force on particle q₂, we need to calculate the individual forces exerted on q₂ by particles q₁ and q₃ and then determine their sum.

The force between two charged particles can be calculated using Coulomb's law:

F = k * |q₁ * q₂| / r²

Where F is the force between the particles, k is the electrostatic constant (k ≈ 9.0 x \(10^9\) Nm²/C²), q₁ and q₂ are the charges of the particles, and r is the distance between them.

First, let's calculate the force exerted on q₂ by q₁:

F₁₂ = k * |q₁ * q₂| / r₁₂²

F₁₂ = (9.0 x \(10^9\) Nm²/C²) * |(8.0 μC) * (3.5 μC)| / (0.10 m)²

F₁₂ ≈ 252000 N

The force is positive because q₁ and q₂ have opposite charges.

Next, let's calculate the force exerted on q₂ by q₃:

F₂₃ = k * |q₂ * q₃| / r₂₃²

F₂₃ = (9.0 x \(10^9\)Nm²/C²) * |(3.5 μC) * (-2.5 μC)| / (0.15 m)²

F₂₃ ≈ -63000 N

The force is negative because q₂ and q₃ have the same charge.

Finally, we can find the net force on q₂ by summing the individual forces:

Net force = F₁₂ + F₂₃

Net force = 252000 N + (-63000 N)

Net force ≈ 189000 N

The net force on particle q₂ is approximately 189000 N.

For more such information on: net force

https://brainly.com/question/14361879

#SPJ8

Answer:

d. convention

Explanation:

hope this helped

Answer:

a. 60 m

b. 71.48 m

Explanation:

Below are the calculations:

a. The phone's height above the ground = Speed x Time

   The phone's height above the ground = 15 x 4 = 60 m

b. Speed when phone drops, u = 15 m/s

At maximum height, v = 0

Use below formula:

v² = u² -2gh

0 = 15² + 2 × 9.8 × h

h = 11.48 m

Total height = 60 + 11.48 = 71.48 m

The efficiency of the engine is 17%.

Given the following data:

To find the efficiency of the engine:

Mathematically, the efficiency of an engine is calculated by using the formula:

\(Efficiency = \frac{E_O}{E_I}\) × \(100\)

Where:

Substituting the given parameters into the formula, we have;

\(Efficiency = \frac{201}{1176}\) × \(100\)

\(Efficiency = 0.171\) × \(100\)

Efficiency = 17%

Therefore, the efficiency of the engine is 17%.

Read more: https://brainly.com/question/22599382

The frequency that the person on the train hears is calculated as 767 Hz.

Frequency is the number of waves that passes a fixed point in unit time.

The formula for the observed frequency (f') of a wave with a known frequency (f) due to the Doppler Effect is:

f' = f (v + vo) / (v + vs)

v : speed of the wave in the medium (in this case, the speed of sound)

vo : speed of the observer (in this case, the speed of the train)

vs is the speed of the source (in this case, assumed to be zero)

vo = 85.0 km/h * 1000 m/km / 3600 s/h = 23.6 m/s

f' = 725 Hz * (343 m/s + 23.6 m/s) / (343 m/s + 0 m/s) = 767 Hz

Therefore, the frequency that the person on the train hears is 767 Hz.

To know more about frequency, refer

https://brainly.com/question/254161

#SPJ1

Using a scale of 1 centimeter = 1 newton, the following displacement vector is

(a) 5 newtons west 5 centimeter.

(b) 3 newtons, 270° 3 centimeter.

(c) 4 newtons, 0°, 4 centimeter.

The International System of Units (SI) uses the centimetre (cm) as a measure of length. It is a handy unit for measuring short distances because its definition is one tenth of a metre. 0.01 metres or 0.3937 inches make up one centimetre.

In the SI system, a newton (N) is a unit of force. It is described as the amount of pressure necessary to accelerate a mass of one kilogramme at a speed of one metre per second squared (m/s2). The force required to accelerate a mass of one kilogramme by one metre per second squared is comparable to one newton, in other words.

To know more about Newton :

https://brainly.com/question/13549064

#SPJ1.

The horizontal forces acting on each object are shown in the diagrams would only cause a change in motion in diagram A

A force causes a change in motion when it is unbalanced, meaning there is a net force acting on an object. According to Newton's first law of motion, an object at rest will remain at rest, and an object in motion will continue to move in a straight line at a constant speed, unless acted upon by an unbalanced force.

When an unbalanced force acts on an object, it will accelerate, meaning its velocity will change.

Learn more about force:https://brainly.com/question/13191643

#SPJ1

Two pieces of evidence lead the Philadelphia chemist Philip Sadtler to conclude that the deaths were the result of fluoride poisoning.

Philip Sadtler, a Philadelphia chemist, suspected fluoride poisoning as the cause of the deaths of several people in the early 20th century. The two pieces of evidence that led him to this conclusion were:

Hence, conclude that the deaths in Philadelphia were likely the result of fluoride poisoning.

To know more about fluoride poisoning here

https://brainly.com/question/28539068

#SPJ1

Answer:

Approximately \(3.967\; {\rm kg\cdot m\cdot s^{-1}}\).

Explanation:

Convert velocity to the standard units (meters per second):

\(\begin{aligned}v &= 246.2 \; {\rm km \cdot h^{-1}} \\ &= 246.2 \; {\rm km \cdot h^{-1}}\times \frac{1\; {\rm h}}{3600\; {\rm s}} \times \frac{1000\; {\rm m}}{1\; {\rm km}} \\ &\approx 68.389\; {\rm m\cdot s^{-1}}\end{aligned}\).

Convert mass to standard units (kilograms):

\(\begin{aligned} m &= 58\; {\rm g} \\ &= 58\; {\rm g} \times\frac{1\; {\rm kg}}{1000\; {\rm g}}\\ &= 0.058\; {\rm kg}\end{aligned}\).

When an object of mass \(m\) travels at a velocity of \(v\), momentum of that object would be \(p = m\, v\). In standard units, the momentum of this tennis ball would be:

\(\begin{aligned}p &= m\, v \\ &\approx (0.058\; {\rm kg})\, (68.389\; {\rm m\cdot s^{-1}}) \\ &\approx 3.967\; {\rm kg \cdot m\cdot s^{-1}}\end{aligned}\).

The velocity of the car moving in the circular path is determined as 1.67 m/s.

Linear velocity is the measure of the rate of change of displacement with respect to time when the object moves along a straight path.

v = d/t

where;

v = (6 x 1000 m) / (1 x 3600 s)

v = 1.67 m/s

Thus, the velocity of the car moving in the circular path is determined as 1.67 m/s.

Learn more about velocity here: https://brainly.com/question/25749514

#SPJ1

5000 seconds, or almost 83.33 minutes time required by Ants to carry a cookie crumb a distance of 50 m from the kitchen table to the ant hill

As per the given information;

Speed = 1 cm/s = 0.01 m/s

Distance = 50 m

Here we have to find out the time required by Ants to carry a cookie crumb a distance of 50 m from the kitchen table to the ant hill.

As we know that:

Time = distance / speed

where distance denotes how far the ant must travel and

speed denotes how quickly it can transport the cookie crumbs.

By substituting the given values, we get:

Time = 50 m / 0.01 m/s

Time = 5000 s

Hence, The cookie crumbs will travel 50 metres from the kitchen table to the ant hill in 5000 seconds, or almost 83.33 minutes.

For similar question on Speed,

https://brainly.com/question/111325

#SPJ4

Answer:

The quartering act of 1765 required the colonies to house British soldiers in barracks provided by the colonies.

Answer:

The answer is "\(5.53 \ \frac{m}{s}\)"

Explanation:

apply the formula for calculating the average velocity to the relative air

\(V_{PG} =V_{PA}+V_{AG}\)

\(\Rightarrow V_{PA} = V_{PG} -V_{AG}\)

Given value:

\(V_{AG} = -2 \ \frac{m}{s}\)

\(V_{PG} =3.53\)

\(\Rightarrow V_{PA} = 3.53 - (-2) \\\\\Rightarrow V_{PA} = 3.53 +2 \\\\\Rightarrow V_{PA} = 5.53 \\\\\)

The final answer is "\(5.53 \ \frac{m}{s}\)" in the south-east direction.

Answer:

An opisometer is used to measure a curved line.

Explanation:

sowwie :( i need points

Explanation:

The diameter of the smaller end of the pipe is approximately 0.78 meters.

To determine the diameter of the smaller end of the pipe, we can use the principle of conservation of mass. According to this principle, the mass flow rate of water should remain constant throughout the pipe.

The mass flow rate is given by the equation:
Mass flow rate = density of water * cross-sectional area * velocity

Since the density of the water remains constant, we can write:
Cross-sectional area1 * velocity1 = Cross-sectional area2 * velocity2

Given that the velocity1 is 13 m/s, the diameter1 is 1.2 m, and the velocity2 is 30 m/s, we can solve for the diameter2 using the equation:
(pi * (diameter1/2)^2) * velocity1 = (pi * (diameter2/2)^2) * velocity2

Simplifying the equation:
(1.2/2)^2 * 13 = (diameter2/2)^2 * 30

Calculating the equation:
(0.6)^2 * 13 = (diameter2/2)^2 * 30

0.36 * 13 = (diameter2/2)^2 * 30

4.68 = (diameter2/2)^2 * 30

Dividing both sides by 30:
0.156 = (diameter2/2)^2

Taking the square root of both sides:
0.39 = diameter2/2

Multiplying both sides by 2:
0.78 = diameter2

To learn more about diameter

https://brainly.com/question/32968193

#SPJ8

Videos can be streamed from the cloud to a computer with no loss in quality because Digital signals are used to transmit data to and from the cloud.

How do digital signals work?

An established or one that represents data as a step made up of discrete values is known as a digital signal. There is no noise produced by digital signals. Electronic signals sent as pulses are used to transmit digital signals to computers. These signals can be found in things like digital phones and computers.

Because digital signals are used to transport data to and from the cloud, it should be noted that videos are said to stream from the cloud to a computer without quality degradation.

Videos can be streamed from the cloud to a computer with no loss in quality because Digital signals are used to transmit data to and from the cloud.

To know more about Digital signals, check out:

https://brainly.com/question/28160561

#SPJ1

The coefficient of static friction between the mass and the surface is 0.270

From the question given above, the following data were obtained:

We can obtain the coefficient of friction as illustrated below:

Frictional force (N) = coefficient of friction (μ) × normal reaction (N)

F = μN

10.6 = μ × 39.2

Divide both sides by 39.2

μ = 10.6 / 39.2

μ = 0.270

Thus, the coefficient of static friction between the mass and the floor is 0.270

Learn more about coeeficient of friction:

https://brainly.com/question/14386054

#SPJ1

Holozoic food acquisition is defined by the absorption of complex organic materials in the way of most creatures.

Holozoic nutrition refers to when creatures consume solid food. The food might be either plant-based or animal-based.

An animal ingests complicated organic food stuff into its body, helps to digest it, and then absorbs it into the living organisms in this process.

Learn more:

https://brainly.com/question/2571338?referrer=searchResults

A. The average speed you can use to pull the safe is 1.02 m/s

B. The time needed to pull the safe up is 17.65 s

First, we shall obtain the force. This is shown below:

F = mg

F = 60 × 9.8

F = 588 N

Finally, we shall obtain the average speed. Details below:

Power = force × average speed

600 = 588 × average speed

Divide both sides by 588

Average speed = 600 / 588

Average speed = 1.02 m/s

The time needed to pull the safe up can be obtained as follow:

Time = Total distance / average speed

Time = 18 / 1.02

Time = 17.65 s

Learn more about average speed:

https://brainly.com/question/31770954

#SPJ1

Complete question:

You know you can provide 600 W

of power to move large objects. You need to move a 60-kg

safe up to a storage loft, 18 m

above the floor.

Part A

With what average speed can you pull the safe straight up?

Part B

What is the time needed to pull the safe up?

Answer:

here u go

Explanation:

The heating of the Earth's surface and atmosphere by the sun drives convection within the atmosphere and ocean. This convection produces winds and ocean currents. The greater the pressure differences between a low-pressure area and a high-pressure area, the stronger the winds.

Answer:

I took the test on K12 and got an A

1. A

2. B

3. A

4. C

5. A

6. C

7. B

8. A

9. C

10.C

Atom A has 10 protons, 12 neutrons, and 10 electrons, while Atom B has 10 protons, 10 neutrons, and 12 electrons.

Atom A and Atom B are not isotopes of each other. Isotopes are atoms of the same element that differ in the number of neutrons but have the same number of protons. In this case, Atom A and Atom B have different numbers of protons, which means they are not isotopes of each other.

The number of protons determines the element, and since Atom A and Atom B have different numbers of protons, they belong to different elements.

Isotopes, on the other hand, have the same number of protons but differ in the number of neutrons.

This variation in the number of neutrons gives isotopes different atomic masses while retaining the same chemical properties.

However, Atom A and Atom B do not fulfill this criterion, so they cannot be considered isotopes of each other.

For more such questions on electrons

https://brainly.com/question/860094

#SPJ8

Answer: The math behind this is quite simple. If you double the force, you double the acceleration, but if you double the mass, you cut the acceleration in half.

Explanation: