Five race cars speed toward the finish line at the Jasper County Speedway. The table lists each car’s speed in meters/second. If each car has the same mass, which car will require the longest time to come to a full stop?Car A Car B Car C Car D Car E
890 m/s 850 m/s 790 m/s 895 m/s 870 m/s

Car A

Car B

Car C

Car D

Car E

Answers

Answer 1

Answer:

The mass of each car is the same so car D will take the longest time to come to a full stop. Hence, option D is correct.

What is acceleration?

In mechanics, acceleration is a unit used to describe how quickly the velocity of an object varies in relation to time. The direction of the net force acting on an object determines its acceleration.

Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is another vector quantity. Acceleration is defined as the change in velocity vector over a time interval divided by the time interval.

According to the question, we want to determine which automobile will take the longest to fully stop because we know that each one has the same mass and the same velocity. Here, we can assume that all the vehicles slow down uniformly, thus the vehicle traveling at the maximum speed will take the longest to come to a complete stop.

To get more information about acceleration :

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Answer 2

Answer:

Answer: Car D.

Explanation:

We know that each car has the same mass, and knowing the velocity of each car, we want to know which car will require the longest time to come to a full stop. Here we may assume that all the cars decelerate at the same rate, so the car with the highest speed is the car that will take the longest income to a full stop.

The answer is car D, which velocity is 895 m/s.

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How high up is a 3.00 kg object that has 300. J of energy

Answers

You are giventhe mass of an object which is 3.00 kilograms. Also, you are given the energyexerted by the object at 300 Joules. You are required to find the height ordistance travelled by your object. You need to know that potential energy isequal to the mass times the gravitational force times the height of the object.Let us denote P as our energy, m as the mass of the object, g as thegravitational force and h as the height. So,

P = mgh
h = P/mg
h = (300 J)/(3kg)(9.8066m/s2)
h = 10.2 m

-3 < -1Which sentence correctly translates the sentence shown here?
A) Negative three is to the left of negative one on the number line.
B) Negative three is to the right of negative one on the number line.
Eliminate
C) Negative three and negative one are to the right of 0 on the number line.
D) Negative three and negative one are on opposite sides of 0 on the number line.

Answers

Answer:

The Answer is D

Explanation:

I know because I just took the test.

Answer:

answer is D

Explanation:

Find the percentage of the total work lost to friction if 28.7 J of work is put into pushing a block up a ramp resulting in 14.2 J of stored potential energy at the top.

Answers

Answer:

14.5 joules

50.5 %

Explanation:

Energy initial +work= energy final

28.7 + work = 14.2

friction did - 14.5 joules of work so percantage of work lost is just 14.5/28.7 *100 or 50.5 %

Driving home from school one day, you spot a ball rolling out into the street (Figure 5-21). You brake for 1.20 s, slowing your 950-kg car from 16.0 m/s to 9.50 m/s.a) What was the average force exerted on your car during braking?
b) How far did you travel while braking?

Answers

a ) v = v o + a t ( the acceleration will be negative )
9.50 = 16.0 + a * 1.2
a * 1.2 = -16.0 + 9.50
a * 1.2 = - 6.5
a = - 6.5 : 1.2
a = - 5.4167 m/s²
F = m * a = 950 kg * 5.4167 m/s²
F = 5,145.8 N ( the average force exerted on a car during braking )
b ) d = v o - a t² / 2
d = 16.0 * 1.2 - ( 5.4167 * 1.2² / 2 ) =
= 19.20 - 3.90 = 15.30 m

I live in the city. It's always warmer in the city, compared to other areas, even at night. Why is that? The rain shadow effect makes surrounding areas cool and moist and the city warm and dry. Buildings absorb and retain heat from the Sun, producing the urban heat island effect. Lake effect snow only affects areas outside of the city. The city receives lake effect snow.

Answers

I live in the city. It's always warmer in the city, compared to other areas, even at night. Why is that?

A.) The rain shadow effect makes surrounding areas cool and moist and the city warm and dry.

B.) Buildings absorb and retain heat from the Sun, producing the urban heat island effect.

C.) Lake effect snow only affects areas outside of the city.

D.) The city receives lake effect snow.

A 4 watt night light is left on for 8 hours each night how much work does it do per night

Answers

1 watt = 1 joule per second

   (4 joules/second) x (3600 second/hour) x (8 hour)

   = (4 x 3600 x 8) (joule)

   = 115,200 joules .

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