1. During an accident investigation, a detective measures the skid marks that a car
left to determine how fast it was initially moving before stopping when it hit a
light pole. The detective measures the distance to be 40 meters. The detective
receives the car's braking acceleration to be 4.57m/s2 from the manufacturer's
manual. Help the detective by solving how fast the car was initially going before
he hit the light pole? Someone please help I’ll give you a brainlest
Answers
Answer:
19.12 m/s.
Explanation:
The following data were obtained from the question:
Final velocity (v) = 0 m/s
Breaking Acceleration (a) = – 4.57 m/s²
Distance (s) = 40 m
Initial velocity (u) =.?
The initial velocity of the car can be obtained as illustrated below:
v² = u² + 2as
0² = u² + (2 × –4.57 × 40)
0 = u² + (– 365.6)
0 = u² – 365.6
Collect like terms
u² = 0 + 365.6
u² = 365.6
Take the square root of both side
u = √365.6
u = 19.12 m/s
Therefore, the car was initially moving at 19.12 m/s.
Related Questions
What is the relationship between the structure of a white blood cell and its function in the body.
Answers
Describe the three particles that make up an atom (name, charge, and location in the atom).
Answers
Answer:Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
Neutron is neutral
Electron is negative
The nucleus is made of protons and neutrons while the electrons surround the nucleus in the form of probability “clouds”
If a person pulls a cart to the right at 5N of force and another person pulls to the left with a 15N of force? What is the net force and it what direction
Answers
Answer:
The net force is 10 [N] acting to the left
Explanation:
To solve this type of problem we must make a sum of the forces acting on the cart, since the forces are vectors, we know that vectors can be added, In this way forces that go in the same direction are added and forces in opposite directions are subtracted.
FL = force to the left = - 15 [N]
FR = force to the right = 5 [N]
FT = Resultant force [N]
- 15 + 5 = FT
FT = - 10 [N]
The negative sign tells us that the force acts to the left.
what is the area of a rectangle having dimensions of 9.8m and 12.7m?
Answers
Answer:
Area = 124.46
Explanation:
I HOPE THIS WAS HELPFUL
Lauren throws her first pitch of the season for her school's softball team. If the ball travels 80 feet and takes 1.58 seconds to travel this distance, what is the speed of the ball? Round you answer to the nearest hundredth.
Answers
Answer:
50.63 ft/s (2dp)
Explanation:
Speed = Distance/Time
80/1.58 = 50.63291139
= 50.63 ft/s (2dp)
PLLLLLLEEEEESSEEEEE HELP!!!!!!!
Answers
if you walk 8km at an average speed of 4km/h, how much time does it take
Answers
Answer:
2 hours
Explanation:
8km = 4km/h x time
Time = 2 hours
Which of the following breakfasts is better than eating no breakfast at all?
A.
Sugary cold cereal and milk
B.
Fruit smoothie
C.
Doughnut
D.
All of the above
Answers
Answer:
D. all of the above
Explanation:
took the quiz
hope this helps :)
A truck traveling at a velocity of 33m/s comes to a halt by decelerating at 11m/s^2. How far does the truck travel in the process of stopping. identify known variables such as V, V0, a, t, and delta x.
Answers
Answer:
The truck was moving 16.5 m/s during the time it took to stop, which was 3 seconds.
Initial velocity = 33 m/sFinal velocity = 0 m/sAverage velocity = (33 + 0) / 2 m/s = 16.5 m/sExplanation:
First, how long does it take the truck to come to a complete stop?( 33 m/s ) / ( 11 m / s^2 ) = 3 secondsThen we can look at the average velocity between when the truck started decelerating and when it came to a complete stop. Because the deceleration is constant (always 11m/s^2) we can use this trick.The time taken to stop the truck is 3 seconds. The final velocity is zero. Then, the distance travelled by the truck is 49.5 m.
What is acceleration ?Acceleration is a physical quantity that, measures the rate of change in velocity. It is a vector quantity thus having both magnitude and direction. It can be defines as the ratio of change in velocity to the change in time.
Given initial velocity = 13.5 m/s
final velocity is zero since the bicycle is stopping.
then Δt = Δv/a
Δt = 33 m/s/ 11 m/s² = 3 seconds.
Hence, the truck will take 3 s to complete stop.
The distance covered within this time can be determined using the equation as follows:
s = u t + 1/2 at²
where u is the initial velocity
The acceleration a = - 11 m/s² the minus sign is due to deceleration.
s = (33m/s × 3 s) + (-11 m/s² ×3 s ×3 s) = 49.5 m.
Therefore, the truck will travel up to 49.5 m before stopping.
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Help Plsss
Which of the following objects are subject to the law of universal gravitation? (circle all that apply)
a. Satellites
b. Water
c. Frogs
d. Stars
Answers
Satellites, water, frogs, and stars all have mass as they are all composed of matter. Thus, all four answer choices should be circled.
Exercise Book: 18
A piece of
radioactive material contains
2000 atoms. If its half life is 20 seconds
the time take for 125 atoms to remain is?
Answers
During a race, a sprinter increases from 4.0 m/s to 6.0 m/s over a period of 1.5 s. What is the sprinter’s average acceleration during this period? (10 Points) 1 meter per second squared 1.3 meters per second 2.0 meters per second 1.3 meters per second squared
Answers
Answer:
[tex]a=1.3\ m/s^2[/tex]
Explanation:
It is given that,
Initial velocity, u = 4 m/s
Final velocity, v = 6 m/s
Time, t = 1.5 s
We need to find the average acceleration of a sprinter during this period. We know that the rate of change of velocity of an object is equal to its acceleration. So,
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{(6-4)\ m/s}{1.5\ s}\\\\a=1.33\ m/s^2[/tex]
So, the acceleration of the sprinter is [tex]1.33\ m/s^2[/tex]. Hence, the correct option is (d).
A block weighing (Fg) 100 N is resting on a steel table (us = 0.68)
The minimum force to start this block moving is. N.
Answers
Answer:68
Explanation:
6.8x100
We have that for the Question "A block weighing (Fg) 100 N is resting on a steel table (us = 0.68) ." it can be said that
The minimum force to start this block moving is [tex]F_{min}=37N[/tex]
From the question we are told
A block weighing (Fg) 100 N is resting on a steel table (us = 0.68)
The minimum force to start this block moving is. N.
Generally the equation for the Maximum force is mathematically given as
[tex]F_{max} =0.74*50\\\\F_{max} =37N[/tex]
Therefore
The Minimum force = max Frictional force
Therefore
[tex]F_{min}=37N[/tex]
Hence
The minimum force to start this block moving is [tex]F_{min}=37N[/tex]
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Which example is of researcher bias in interpreting data?
A scientist wishes to determine the area of an ice sheet. To do so, he relies on spectrographic images sent by satellite.
A health official investigates the spread of HIV in her city. She takes a census of the HIV status of every adult resident.
A geologist wants to determine whether the water level of an aquifer is declining. To find the answer, he digs a well.
A researcher seeks to prove that babies smile at two months old. She counts some confused expressions as smiles.
Answers
Answer:
A researcher seeks to prove that babies smile at two months old. She counts some confused expressions as smiles.
Explanation:
This is the answer because its not actual date due to the fact she's using her opinion to decided whether or not the expression a baby is making is a smile, whereas the other answers had factual data involved.
A general contractor drives 5 miles to the hardware store in 10 minutes. He shops for needed tools for 30 minutes, then drives to his customer’s home at an average speed of 45 mph. He arrives 20 minutes later. Calculate the average speed from the time the contractor leaves his office to the time he arrives at his customer’s home.
Answers
Given parameters:
Distance to hardware shop = 5 miles
Time to reach hardware shop = 10 minutes
Time spent at the shop = 30 minutes
Average speed to customer home = 45 mph
Time taken for the travel = 20 minutes
Unknown:
Average speed of the contractor = ?
Solution:
Average speed is the total distance covered divided by the total time taken.
Average speed = [tex]\frac{total distance}{total time taken}[/tex]
total distance = distance to hardware shop + distance to customer's home
We do not know the distance to customer's home but we have been given the speed and time, so we can find the distance.
Distance = speed x time
Convert the time to hrs and solve;
60 minutes = 1 hr
20 minutes = [tex]\frac{20}{60} hr[/tex] = [tex]\frac{1}{3} hr[/tex]
So, Distance = 45mph x [tex]\frac{1}{3} hr[/tex] = 15miles
Now;
Total distance = 5 + 15 = 20miles
Total time = time to reach hardware shop + time to reach customer's house
= 10 + 20
= 30 minutes
Convert the time from minutes to hrs;
60 minutes = 1hr
30 minutes = [tex]\frac{30}{60}[/tex] = 0.5hr
So;
Average speed = [tex]\frac{20}{0.5}[/tex] = 40mph
The average speed is 40mph
When you travel 20km in 1 hour, at what speed do you travel.
Answers
Answer:
at 20km/h
Explanation:
Hillary is dropping objects that are the same volume. She wants to investigate how an object’s mass affects the average speed at which it travels when dropped, until it hits the ground. Which variable must Hillary change during the experiment?
A. the timer
B. the drop height
C. the mass of the object
D. the place where she drops it
Answers
Answer:
letter C. The mass of the object.
Explanation:
i hope it helps.
Patty decides to try another experiment. From the
same branch, she drops a large, heavy rock and a
small pebble. What would happen this time?
Answers
Answer: They will fall at the same time
Explanation:I had a google doc about this
When air resistance is considered, the effect of the air resistance will cause the rock to fall faster than the pebble which will be delayed due to its lesser weight. In the absence of air resistance, both rock and pebble will fall down at the same time.
What are free fall and air resistance?Free fall is a motion of an object in which the force of gravity is the only force acting upon it. A body moving upwards would not be considered to be falling. But if the body falls under the effect of the force of gravity, it is said to be in free fall.
Free fall is a type of motion in which no air resistance is considered and the force acting upon an object is only gravity. All bodies under such conditions fall with an equal rate of acceleration, regardless of their masses.
As a body falls through the air, have suffered some degree of air resistance. Air resistance is the collisions of the surface of an object with molecules present in the air. The factors that have a direct effect on the amount of air resistance are the cross-sectional area and the speed of the object.
As the rock had greater weight than the pebble in the absence of air resistance it will fall faster than the pebble.
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Which of the following describes bias in an experiment?
A. When researchers draw conclusions that do not support the hypothesis.
B. When researchers draw conclusions that are consistent with their observations.
C. When researchers blind themselves to participants in the groups, so they don't accidentally reveal the information.
D. When the personal opinions, Ideas, or judgments of the researchers influence their research.
Answers
When the personal opinions, Ideas, or judgments of the researchers influence their research, then the experimental investigation and observation are considered biased, therefore the correct answer is option D.
What is the scientific claim?Scientific claims are statements made in science based on an experiment.
These Scientific claims are backed by experimental data and their true results obtained from scientific investigation and experimentation.
The right response is option D because experimental study and observation are deemed biased when the researchers' own ideas, beliefs, or judgments affect their findings.
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What is Speed? the ability to rest the ability to rest the ability to minimize the time cycle of a given movement the ability to minimize the time cycle of a given movement the ability to apply force the ability to apply force the ability to use oxygen?
Answers
Answer:
Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time.
Explanation:
The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time.
what body part plays a strong role in releasing power
Answers
Answer:
I think your bones, muscles, and joints your welcome :)
Explanation:
(1) A block of mass 800g is pulled from rest on a horizontal
frictionless bench by a steady force of F and it travels 16m in 2
seconds. Find:
(a) The acceleration?
(b) The value of F?
Answers
Answer:
a) 8m.[tex]s^{-2}[/tex]
b) 6.4N
Explanation:
a)Using [tex]s=ut+1/2at^{2}[/tex]
s=16
u=0
t=2
a=?
16=1/2a(4)
a=8m.[tex]s^{-2}[/tex]
b) F=ma
Where m is in kg
Convert 800g to kg
800/1000=0.8kg (1000g in a kg)
F= 0.8 x 8 = 6.4N
Which is true A. You can see both lunar and solar eclipses from outside the shadow.B. You can see neither lunar and solar eclipses from outside the shadow. C. You can see only lunar from outside the shadow. D. You can see only solar eclipses from outside the shadow. .plz.help
Answers
Answer:
A
Explanation:
A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
What is a translucent object?
Answers
an object that isn't completely transparent or opaque kinda the middleground
it allows light through but it's not clear
Three pucks A, B, and C are shown sliding across ice at the noted speeds. Air and ice friction forces
are negligible (they are assumed to not exist) Rank the forces needed to keep them moving
greatest to least. You must justify your answer
A=2 m/s
B= 4 m/s
C=6 m/s
Answers
The puck that required the greatest force to be stopped is puck C, followed by puck B and the least is puck A.
Applied force
The force needed to stop the pucks or applied to stop the pucks is determined by applying Newton's second law of motion as shown below;
F = ma
F = mv/t
where;
F is the applied forcem is the mass of the pucksv is the speed of the puckst is the timeFrom the quation above, the applied force is directly proportional to the speed of the pucks. Thus, the greater the speed of the puck, the greater the required force to stop the puck.
Therefore, the puck that required the greatest force to be stopped is puck C, followed by puck B and the least is puck A.
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Calculate the speed of a bus that travels a distance of 55 miles in 0.75 hours.
Answers
a car is driven 1.5 kilometers west in 2 minutes. what is the velocity in m/s?
Answers
Velocity=-1.5/2
Velocity = -3/4 or -0.75
Which is NOT a symptom of hemophilia:
А.Excessive bleeding
B.Easy bruising
C.Heart attack
D. Joint pain
Answers
Answer:
c. heart pain
Using the law of conservation of energy, what is the kinetic energy at B? K.E. = 3, 6, or 4.8
Answers
Answer:
3
Explanation:
What is the momentum of an object with a mass of 60 kg and velocity of 10 m/s?
heeelp
Answers
Answer:
Linear momentum= Mass*Velocity
P=mv
P=60*10
P=600Kg m/s
