You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal mass (1,000 kg each) were involved in a rear-end accident at a stop sign. Here is what you know: Car 1 approached the intersection from the top of a 25-meter hill. Car 2 was on a flat stretch of road directly in front of Car 1. At the bottom of the hill, Car 1 was going 20 m/s; Car 2 was going 30 m/s before it stopped at the stop sign. There were no skid marks left by Car 2. The collision occurred at the stop sign, where Car 2 had stopped. After the collision, both cars were moving together in the same direction at 10 m/s before slowly rolling to a stop. You must now push Car 2, using 800 N of force, 10 meters off to the side of the road so no one else gets hurt.
1. What was the potential energy of Car 1 at the top of the hill? (3 points)




2. What was the kinetic energy of each car before braking? (4 points)




3. A. How much energy did Car 1 lose from the top to the bottom of the hill? (3 points)




B. Where do you suppose that energy went? (2 points)




4. How much work was done to bring Car 2 to a stop? (4 points)




5. If Car 2 came to a stop in 15 seconds, how much power (in watts) did it take to stop Car 2 at the stop sign by applying force to the brakes? (3 points)




6. What is the final combined momentum of the cars right after the accident? (6 points)




7. Assuming that there are no other nonconservative forces involved, what impulse was given to each car during the collision? (6 points)
A. Car 1 (3 points)




B. Car 2 (3 points)




8. How much energy did Car 1 lose in the collision? (3 points)




9. How much energy did Car 2 gain in the collision? (3 points)




10. Which of the two laws covered in this unit - Law of Conservation of Momentum or Law of Conservation of Energy - is obeyed in this problem? Explain your reasoning. (5 points)




11. How much work did it take to move Car 2 off to the side of the road? (3 points)




12. If it took you 40 seconds to move Car 2 off the road, how much power did you expend? (3 points)




13. Which simple machine does a car have that helped you move Car 2? Explain. (2 points)

Answers

Answer 1
6. Is 50 m/s that’s the answer

Related Questions

What is the speed of a high-speed electron traveling at right angles to a 0.80-tesla magnetic field with a force of -7.5 x 10^-12 newtons? The charge of an electron is 1.60 x 10^-19

Answers

Explanation:

Answer:

Magnetic field, B = 0.016 Tesla

Explanation:

It is given that,

Velocity of electron, v=9.6\times 10^5\ m/sv=9.6×10

5

m/s

Magnetic force, F=2.6\times 10^{-15}\ NF=2.6×10

−15

N

Charge, q=1.6\times 10^{-19}\ Nq=1.6×10

−19

N

The magnetic force is given by :

F=qvBF=qvB

B=\dfrac{F}{qv}B=

qv

F

B=\dfrac{2.6\times 10^{-15}}{1.6\times 10^{-19}\times 9.6\times 10^5}B=

1.6×10

−19

×9.6×10

5

2.6×10

−15

B=0.016\ TB=0.016 T

So, the magnitude of magnetic field is 0.016 Tesla. Hence, this is the required solution.

Answer:

F = q  v B so v = F/q B

v = -7.5 × 10-12/(-1.60 × 10-19) (0.80) = 5.9 × 107 m/s

Explanation:

For any energy source including batteries, there will be conduction of electricity if there is a potential
difference
similarity

Answers

Answer:

Difference

Explanation:

The electricity conduction happens when there is a flow of current. The flow of current from one point to another can only occur if there is a potential difference.

If there is not potential difference between two points the current will not flow and thus electricity conduction will also be not possible. The current in the circuit will flow from higher potential point to lower potential point.

Convection currents not only in the Earth's core but in what?

A. Only liquids
B. When a dense substance is warmer than a less dense substance
C. In both liquids and gases
D. Weakly in solids

Answers

Answer:

B. When a dense substance is warmer than a less dense substance

Explanation:

How does planting high yield crop varieties make farming more sustainable

Answers

Answer:

The more high yield crops are planted, the more production there will be from plants.

Explanation:

High-yield plants are plants that are genetically modified or modified artificially in a way that makes farming plants more efficient. More crops grow, therefore more money.

The answer is, the more high-yield plants there are, the more efficiency there will be from farming.

Answer:

Its D

Explanation:

my options were these

A. It increases the amount of water needed

B. It keeps soil fertility from diminishing over time

C. It keeps chemicals form entering the watershed

D. It decreases the amount of land needed

the two ways you could increase acceleration

Answers

Answer: mass(how much the object weighs) and force(how hard you push the object)

Explanation:

HELP ASAP
this is for science, and if i get the questions right, I pass, but the teacher never taught us the lesson, idrk y. so i really need help:( Im giving away 20 points so please give me your best answers ;)


1. As an astronaut travels from the surface of Earth to a position that is four times as far away from the center of Earth, based on the Law of Gravity which of the following statement is true?


a. mass remains the same and the gravitational pull from Earth decreases

b. weight remains the same and the gravitational pull from Earth changes

c. weight increases and the gravitational pull from Earth stays the same

d. mass decreases and the gravitational pull from Earth increases

2. A satellite is sent into orbit around the Earth, In which of the following situation would the gravitational force be the greatest?


A. 1200 lb satellite orbiting 150 miles above Earth’s surface

b. 850 lb satellite orbiting 150 miles above Earth’s surface

c. 850 lb satellite orbiting 1500 miles above Earth’s surface

d. 1200 lb satellite orbiting 1500 miles above Earth’s surface


3. High and low tides are the regular pattern of rising and sinking ocean-water levels. They are caused when the sun’s gravity and the moon’s gravity pull on ocean water. The moon’s gravity has a greater effect on Earth’s oceans than the sun’s gravity. Why would the moon have a greater effect than the sun?


a. The moon has less mass than the sun.

b. The moon is closer to Earth than the sun.

c. The moon is not as hot as the sun.

d. The moon has less mass than Earth.



4. Which statement about the universality of gravity is false?


a. The gravitational force between two objects depends only on their masses.

b. Any two objects that have mass also have a force of gravity acting between them, no matter how far apart they are.

c. The gravitational force between two objects increases if the objects move closer together.

d. The gravitational force between two objects increases if mass is added to one object.

Answers

Answer:

1)a- mass never changes as you move from the earth

2)actually am not sure I haven't been taught that too

3)b

4)a-it doesn't depend only on mass but also weight

Which term is defined as the force applied to the object divided by the mass of the object?

speed
velocity
mass
acceleration

Answers

Answer:

acceleration

Explanation:

From the question: "FORCE... divided by the MASS..." is translated to a math equation as "F / m", where "F" is the force and "m" is the mass.  

Now, the second Newton's law says "F = m . a ", where a is acceleration.

If you move m to the left side, clearly you have "F / m", and "a" is alone to the right. Math equation:

a = F / m

acceleration = force / mass

The pressure of water at the bottom of a well is _________ than at the surface of the pond.

Answers

Answer:

Greater

Explanation:

When you go deeper in water, the presure increases, the deeper you go, so it would be greater in a well then the surfce of a pond. Hope this helps!

An airplane moves in straight level flight at constant velocity. What is the
net force acting on it if the mass of the plane is 1000 kg and the frictional
drag of the air is 1800 N? *

Answers

Answer:

Net force = 0

Explanation:

We have, an airplane moves in straight level flight at constant velocity.

Mass of the plane is 1000 kg

The frictional force acting of the air is 1800 N.  

It is required to find the net force acting on it. We know that net force is given by the product of mass and acceleration. But here the airplane moves with constant speed, it means its acceleration is equal to 0 such that net force is equal to 0.

   

3. Which of the following is an example of a
supplemental restraint system?
(a) air bag
(c) lap and shoulder belt
(b) safety belt
(d) antilock brakes

Answers

Answer:

A) air bag is your answer

Answer:

air bag

Explanation:

Any of several restraining systems in a vehicle, such as an airbag, in addition to the seatbelts.

What is the volume of this rectangular prism?
1/4cm 1/3cm 1/2cm​

Answers

Answer:

1/24

Explanation:

1/4 * 1/3 * 1/2 = 1/24

Answer:

1/24

Explanation:

A light beam approaches a plain mirror at an incident angle of 39
degrees. What is the angle of reflection?

Answers

Angle is 31 adding all sides

What is the advantage of the SI unit over CGS units?
Help me ...
answer it as fast as you can...​

Answers

Answer:

The advantage of the SI unit over CGS unit are:

S.I has broader base. It has seven base units and two supplementary units.S.I is metric.S.I is coherent.S.I is rational, i.e. it gives one unit for one physical quantity .e g. for energy of any type i.e, mechanical or heat or electrical.There is only one unit Joule(J) but in M.K.S system unit for mechanical energy is joule.

HOPE IT WILL HELP YOU

Units of measurements

The advantage that SI unit has over CGI is that it has only one unit for each measurement

Explanation:

CGS: Also known as Gaussian units

Length is measure in cm (centimeter)

Mass is measured in g (gram)

Time is measured in s (second).

SI unit: The International System of Units

Length is measure in meter (m)

Mass is measured in kilogram (kg)

Time is measured in seconds (s)

In summary with the SI unit student do not need to store any conversion factors in memory

A few Physics questions regarding circuits and electricity.

Answers

Answer:

7.series

Explanation:

in parallel is like if one bulb stops work all the others will stop too

in series it remains constant or it wont change throughout a series circuit

What of the following does NOT influence resistance? *
A.thickness of wire
B.temperature
C.material of wire
D.Number of components

Answers

Answer:

D. Number of components

Explanation:

Answer:

D. Number of components

Explanation: hope this helps :)

Television satellites use infrared waves to transmit. true or false

Answers

Answer: false

Explanation: Because Television satellites use microwaves waves to transmit.

Answer: False

Television satellites don't use infrared waves to transmit.

A loop with a break in it that prevents current from flowing is called a(n)_______
circuit.

Answers

Answer:

an open circuit

Explanation:

TRUE or FALSE? If an object moves in a circle at a constant speed, its velocity vector will be constant. Explain your answer.

Answers

the velocity will change since the direction changes. what is the relationship between velocity and acceleration in a circle.

identify the correct order of increasing intermolecular force of attraction for the three most common states of matter.

A) liquid - solid - gas
B) Solid - liquid - gas
C) gas - liquid - solid
D) gas - solid - liquid

Answers

I believe it’s C) gas- liquid- solid

The correct order of increasing the intermolecular force of attraction for the three most common states of matter is C) gas - liquid - solid.

What is an intermolecular force in matter?

An intermolecular force is a force of attraction or repulsion that exists between molecules or atoms within a substance.

Here,
In the gaseous state, the intermolecular forces are weak, and the molecules are far apart and move freely in all directions. In the liquid state, the intermolecular forces are stronger, and the molecules are closer together, but still able to move past each other. In the solid state, the intermolecular forces are the strongest, and the molecules are tightly packed together in a fixed arrangement, which results in a definite shape and volume.

Therefore, the correct order of increasing the intermolecular force of attraction for the three most common states of matter is gas, liquid, and solid.

Learn more about intermolecular force here:

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This graph provides data on the amount of water needed to grow four different crops, each used to produce ethanol, a fuel. For each crop, the data shows how many liters of water are needed to produce one liter of ethanol fuel. Which of the following would require using the most water? *



Producing 100 L of ethanol from sugar cane
Producing 200 L of ethanol from sugar beet
Producing 300 L of ethanol from potatoes
Producing 400 L of ethanol from corn

Answers

Answer:

Producing 300 L of ethanol from potatoes

Explanation:

From the diagram, one liter of ethanol production from sugar cane requires 2000 liters of water. Hence, in order to produce 100 L of ethanol from sugar cane, 2000 x 100 = 200,000 L of water.

1000 liters of water is needed to produce 1 liter of ethanol from sugar beet. Hence, 200 x 1000 = 200,000 L of water will be needed to produce 200 liters of ethanol.

1000 liters of water is also required to produce 1 liter of ethanol from potatoes, hence, 300 x 1000 = 300,000 L of water would be required to produce 300 L of ethanol from the same material

About 500 liters of water is required to produce 1 liter of ethanol from corn, hence, 400 x 500 = 200,000 L of water would be needed to produce 400 L of ethanol from corn.

In conclusion, producing 300 L of ethanol from potatoes would require using the most water among all the options.

An object has an acceleration of 18.0 m/s/s. If the net force was doubled and the mass were tripled then the new acceleration would be

Answers

Answer:

12.0 m/s²

Explanation:

Newton's second law:

F = ma

Solving for acceleration:

a = F/m

If force is doubled and mass is tripled:

a' = (2F)/(3m)

a' = ⅔ (F/m)

a' = ⅔ (18.0 m/s²)

a' = 12.0 m/s²

The new value of acceleration of object is 12 m/s².

Given data:

The magnitude of acceleration of object is, [tex]a =18 \;\rm m/s^{2}[/tex].

Let F be initial net force and m be the initial mass. Then as per the problem, the new values of each are,

F' = 2F

m' = 3m

Apply the Newton's Second law, which says that the product of mass and acceleration of object given net force. Then,

F = ma

F = m(18)

F/m = 18 .................................................(1)

Now, for new value of net force,

F' = m'a'

2F = (3m) a'

2F/3m = a'

a' =2/3× (18)                                                   (From equation 1)

a' = 12 m/s²

Thus, we can conclude that the new value of acceleration of object is 12 m/s².

Learn more about the Newton's second law here:

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does space have plenty of oxygen ​

Answers

Answer:

I don't think so because we can't breathe in space

Explanation:

Answer:

No

Explanation:

There is no oxygen in space, so astronauts must bring tanks of oxygen

Balance chemical reactions: please help question attached

Answers

2 AsI —> 2 As + 3 I

hope this helps!

F.
Using this formula m = =, If a car is pushed with a net force
of 5000N, resulting in an acceleration of 3.5m/s2, what is the
mass of the car?
a 1438.5kg
b 1428.6kg
c 1328.6kg
d 1421.6kg

Answers

Answer:

C

What is the answer please help her

Science question!! Please help

Answers

Answer:

It lasted two hours or 120 minutes, it would be smart to say that he was riding up it during the interval 20-60min and riding down it during the interval 60-80min. This is an assumption made because of his speed, when going up a hill our speed is slower while when riding down it, you gain a lot of speed.


Which of the following provides the best summary of the process of natural
selection?

A. Population sizes increase with every generation.

B. Individuals pass on their best traits to their offspring.

C. Mutations help an individual survive and reproduce.

D. Well-adapted individuals survive and reproduce.

Answers

Answer:

B. Individuals pass on their best traits to their offspring.

Explanation:

because genes are always passed from parents to offspring.

The best summary of the process of natural selection is Individuals pass on their best traits to their offspring. Hence, the correct option is B.

What is the theory of Natural selection?

The theory of natural selection gives the mechanism of evolution. It defines the method of different survival and reproduction of individuals due to differences in phenotype.

The theory of natural selection was proposed by Charles Darwin as a way of adaptation and speciation. The variations occur in organisms by random mutations occurring in the genome of individual organisms and this change in mutations may inherit in offspring.

Organisms that are more adapted to the environment are more likely to survive and pass on the genes to future generations. This process cause changes to the generations and diverged over time.

The organisms produce more offspring that are able to survive in the environment. The four factors of natural selection are Variations, Inheritance, Selection, and time.

Thus, the best summary of the process of natural selection is individuals pass on their best traits to their offspring. Hence, the ideal solution is option B.

To learn more about the Theory of natural selection:

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Traveling in circle requires a net force

Answers

Answer:

Circular motion requires a net inward or "centripetal" force. Without a net centripetal force, an object cannot travel in circular motion. In fact, if the forces are balanced, then an object in motion continues in motion in a straight line at constant speed.

Explanation:

a force of 20 N acted on a ball thereby imparting an impulse of 70 Ns to the ball. For how long did the force act on the ball?

Answers

50n which would be 5 seconds?

Answer:3.5 seconds

Explanation:

The functional unit of the kidney is the ________?

Answers

Answer:

nephron

Explanation:

I can't really explain this one.

Answer:

nephron

Explanation:

thats what it is

Determine What is the efficiency of a machine whose work output is 4 joules, and whose work input is 10 joules?

Answers

Answer:

The efficiency of the machine is 40 %.

Explanation:

We have,

Output work by the machine is 4 joules and the input work is 10 joules.

It is required to find the efficiency of a machine. The efficiency of a machine is given by the ratio of output work to the input work. It is given as :

[tex]\eta=\dfrac{4}{10}\times 100\\\\\eta=40\%[/tex]

So, the efficiency of the machine is 40 %.

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