Car A of mass 1500 kg travelling at 25 m/s collides with another car B of mass 1000 kg travelling at 15 m/s in the same direction. After collision, the velocity of car A becomes 20 m/s. Calculate the velocity of car B after collision.

Answer:

0.000001 kg

Explanation:

because 1 kg equal 1,000,000 milligrams

we take   [tex]\frac{1}{1,000,000}[/tex] which equals 0.000001 kg

Answer:

1.83 meters

Explanation:

1 meter = 100 cm

183cm/100cm= 1.83 meters

Answer:

Take the following steps

putting on gloves before treating the cut

using disinfectant on the cut

calmly telling the lab instructor

washing hands after treating the cut scalpel safety rules scalpel

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Report inappropriate predictions

Answer:

200 mph.

Explanation:

If a NASCAR driver travels 600 miles in 3 hours, the way to calculate the speed at which the car is driving comes from dividing the distance factor by the time factor.

Thus, we must divide 600 by 3 (600/3), which gives 200 as result. Thus, if in 3 hours he travels 600 miles, in one hour he will travel 200 miles, which means that his average speed is 200 mph.

Answer:

13.33 seconds

Explanation:

At maximum height, the equation of motion becomes:

v = u + at

Since the object was thrown vertically, the initial velocity (u) is zero and the acceleration (a) becomes the acceleration due to gravity (10 m/s2). The equation becomes:

v = at

v = 480 km/hr = 133.333 m/s

    10t = 133.333

       t = 133.333/10

           t = 13.33 seconds.

The time for the ball thrown vertically with a velocity of 480 km/hr to reach the maximum height is 13.33 seconds.

Answer:

The car's initial velocity is 195.96 m/s

Explanation:

Given;

the length of the mark, x = 9.6 km = 9600 m

acceleration of the car, a = -2 m/s²

Apply the kinematic equation below

v² = u² + 2ax

where;

v is the final velocity = 0

u is the initial velocity

simplify the equation and you will obtain;

0 = u² + 2ax

0 = u² + 2(-2)(9600)

0 = u² - 38400

u² = 38400

u = √38400

u = 195.96 m/s

Therefore, the car's initial velocity is 195.96 m/s

Answer:

B

Explanation:

It's saying what you think

Answer:

B.

Explanation:

Answer:

Yes you  worked

Explanation:

You may have not seen a good outcome but you did put effort in.

When a force is applied on the car and it doesn't move then it simply means

work wasn't done.

The formula for work is given below:

Work = Force ₓ Displacement

For work to have been done , the applied force must cause the object to

change its position(displacement).

In situations where the force applied doesn't cause a change in position then work can't be calculated. This means no work was done on the car despite the applied force causing him to be tired.

Read more on https://brainly.com/question/19746065

Answer:

Acceleration and the distance traveled are 0.9 m/s² and 4.05 m

Explanation:

Given that,

Initail speed, u = 0

Final speed, v = 2.7 m/s

Time, t = 3 s

To find,

The acceleration and distance traveled.

Solution,

Acceleration is change in speed per unit time

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{2.7-0}{3}\\\\a=0.9\ m/s^2[/tex]

Let s is the distance,

[tex]d=ut+\dfrac{1}{2}at^2\\\\\because u=0\\\\d=0+\dfrac{1}{2}\times 0.9\times 3^2\\\\d=4.05\ m[/tex]

So, acceleration and the distance traveled are 0.9 m/s² and 4.05 m

Answer:

3,00,000

Explanation:

because 1 m =100m so, 3000x100=300000

The car's average acceleration is

a (ave) = (30 m/s - 40 m/s)/(5 s) = -2 m/s^2

(That is, divide the change in velocity by the time it takes for the change to take place.)

If acceleration is constant, then it is equal to the average acceleration.

Answer:

(a) The parachutist spent 24.84 secs in air

(b) The height the fall begins is 472 m

Explanation:

Here is the complete question:

A parachutist bails out and freely falls 63 m. Then the parachute opens, and thereafter she decelerates at 1.5 m/s2. She reaches the ground with a speed of 3.3 m/s. (a) How long is the parachutist in the air  (b) At what height does the fall begin?

Explanation:

From one of the equations of kinematics for free fall

[tex]H = ut - \frac{1}{2}gt^{2}[/tex]

Where H is the height

u is the initial velocity

t is the time

and g is the acceleration due to gravity (Take g = 9.8 m/s2)

Now, we can find the time spent before the parachute opens.

u = 0 m/s (we assume the parachutist starts from rest)

H = - 63 m

∴[tex]-63 = 0(t) - \frac{1}{2}(0.98) t^{2} \\-63 = -4.9 t\\t^{2} = \frac{63}{4.9} \\t^{2} = 12.86\\t = \sqrt{12.86} \\t = 3.59 s[/tex]

This the time spent before the parachute opens

Also from one of the equations of kinematics for free fall

[tex]v = u - gt[/tex]

where v is the final velocity

We can determine the final velocity before the parachute opens and she starts to decelerate

∴[tex]v = - 9.8(3.59)\\v = - 35.18m/s[/tex]

Now, we will calculate the time spent after the parachute opens

From one of the equation of kinematics for linear motion,

[tex]v = u + at[/tex]

Here, the initial velocity will be the final velocity just before the parachute opens, that is

[tex]u = - 35.18 m/s[/tex]

From the question,

[tex]v = - 3.3 m/s[/tex]

[tex]a = 1.5 m/s^{2}[/tex]

We then get

[tex]-3.3 = - 35.18 + (1.5)t[/tex]

[tex]-3.3 + 35.18 = 1.5t\\31.88 = 1.5t[/tex]

[tex]t = \frac{31.88}{1.5}[/tex]

[tex]t = 21.25 secs[/tex]

(a) To determine how long the parachutist is in the air,

That is sum of the time used when falling freely and the time used after the parachute opens

= 3.59 secs + 21.25 secs

24.84 secs

Hence, the parachutist spent 24.84 secs in air

(b) To determine what height the fall begins

First, we will calculate the height from which the parachute opens

From one of the equation of kinematics for linear motion,

[tex]x = ut + \frac{1}{2}at^{2} \\[/tex]

[tex]x = -35.18(21.25) + \frac{1}{2}(1.5)(21.25)^{2} \\x = -747.58 + 338.67\\x = -408.91m\\[/tex]

[tex]x[/tex] ≅ [tex]- 409m[/tex]

Hence, the height the fall begins is 63m + 409m

= 472 m

Answer:

All investigations share steps of the scientific method, such as asking a question, conducting research, or analyzing data. The differences between investigations are usually related to what's being examined and the order of the steps followed.

In a criminal investigation, facts are collected about a crime that has already happened. While there are individual tests that can be done on certain types of evidence, there isn't an experiment to test every part of a crime. It can also be difficult to control all factors in a crime scene in order to test one variable at a time. Usually, there are so many variables and missing facts in a crime that a hypothesis and conclusion are hard to determine.

Explanation:

hope it helps <3

All types of investigation involve the steps of the scientific method, such as asking questions, researching, analyzing data, etc.

The research methods and techniques that can be used in order to develop hypotheses, conduct experiments, analyze data, and draw conclusions are called scientific investigations.

The evidence does not give enough solutions but it can lead to new issues for investigation. The methods that can be used by scientists to do scientific investigations involve scientific methods. The steps utilized by scientists to conduct the scientific investigation include:

Scientific investigation starts with an observation. After observing unusual we commonly question ourselves.

A hypothesis can be described as the possible answer to any scientific question. The hypothesis is logical still it can be falsifiable. The results of the test whether the evidence agrees with the prediction and supports the hypothesis or not to create a conclusion.

Learn more about scientific investigations, here:

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Answer:

q₁ / q₂ = 4

Explanation:

In this exercise we must use Coulomb's law

         F = k q₁q₂ / r²

For this case the electric force is

        F = k q₁ Q / r₁²

indicate that another particle q₂ has the same force on Q, but for r₂ = r₁ /2

        F = k q₂ Q / r₂²

we equate the two equations

           q₁Q / r₁² = q₂ Q / r₂²

we substitute r₂

        q₁Q / r₁² = q₂ Q / (r₁/2)²

        q₁ = q₂ 4

the relationship between the two charges is

         q₁ / q₂ = 4

Answer: No

Explanation: Once you bounce the ball it will go higher and then it will slowly come back down

Answer:

depends the material

Explanation:

if its rubber yes for sure

Answer:

It will be 400 meters.

Explanation:

100 total seconds divided by 5 second interval equals 20.

Then 20 intervals multiplied by 20 meters per interval equals 400 meters.

Explanation:

The acceleration on an object due to the gravity of any massive body is represented by g (small g). The force of attraction between any two unit masses separated by unit distance is called universal gravitational constant denoted by G(capital g). The relation between G and g is not proportional. That means they are independent entities.

G and g

In physics, G and g can be related mathematically as –

\(g=\frac{GM}{R^{2}}\)

Where,

1=g is the acceleration due to the gravity of any massive body measured in m/s2.

2=G is the universal gravitational constant measured in Nm2/kg2.

3=R is the radius of the massive body measured in km.

4=M is the mass of the massive body measured in Kg.

Answer:

The  value  is  [tex]C =  21.07 ppm[/tex]

Explanation:

From the question we are told that

 The volume of the first  aliquot is [tex]V_a1  =  25.0 \  mL[/tex]

 The  volume after dilution is  [tex]V_A =  50.0mL[/tex]

 The  Absorbance of the first solution  is  [tex]A_1 =  0.656[/tex]

 The  wavelength at which the absorbance occurred is   [tex]\lambda _1 =  348 nm  =  348*10^{-9} \  m[/tex]

    The  length of the cell [tex]l  = 2.50 \  cm[/tex]

    The volume the second  aliquot is [tex]V_{a2}  =  25.0 \  mL[/tex]

     The  volume of the solution it was mixed with is  [tex]V_s  =  10.00mL[/tex]

     The  concentration of quinine in the 10 mL solution  [tex]Z =  25.7ppm[/tex]

    The volume of the second solution after dilution is [tex]V_d = 50.0 mL[/tex]

      The  absorbance of the second solution is [tex]A_2 =  0.976[/tex]

Generally the concentration of quinine is mathematically represented as

         [tex]C =  \frac{A_1 *Z *  V_s  }{(A_2 -A_1) V_{a2}}[/tex]

=>    [tex]C =  \frac{ 0.656  *  25.7 *  10.0}{ (0.976 -  0.656) *  25}[/tex]

=>   [tex]C =  21.07 ppm[/tex]

Answer:

true

Explanation:

Answer:

yes

Explanation:

you don't learn it until high school

Explanation:

Using kinematics,

t = 4s

u = 0m/s

a = 9.8m/s^2

Therefore v = u + at = 0 + (4)(9.8) = 39.2m/s.

Answer:

reflection is the act of reflecting or the state of being reflected while echo is

reflection of sound waves from a surface back to the initial listener

Answer:

33 hours or equivalently: 1980 minutes

Explanation:

Use the formula for movement under constant velocity, as the velocity equal the distance traveled divided by the time it took, and solve for the unknown time (t):

[tex]v=\frac{distance}{t} \\t=\frac{distance}{v} \\t=\frac{8.25\,\,km}{0.5 \,\,km/h} \\t = 33 \,\,h[/tex]

which can also be given in minutes as : 33 x 60 = 1980 minutes

Answer:

From an average distance of 142 million miles (228 million kilometers), Mars is 1.5 astronomical units away from the Sun.

Mars is four planets away from the sun.

(Here is a pic as well, hopefully it helps!)

Answer:

Volume equals to thrice the length. [tex][V] = [L]\times [L]\times [L][/tex]

Explanation:

Dimensionally speaking, volume equals to thrice the length. That is:

[tex][V] = [L]\times [L]\times [L][/tex]

Example reuikfur2skied

Answer:

Stars produce energy from nuclear reactions, primarily the fusion of hydrogen to form helium. These and other processes in stars have lead to the formation of all the other elements.

Explanation:

Answer:

The answer is C)

Explanation:

C) Nuclear fusion

Answer:

Total height (s) = 176.4 m

Explanation:

Given:

Initial velocity (u) = 0 m/s

Time taken (t) = 6 sec

Acceleration due to gravity = 9.8 m/s²

Find:

Total height (s)

Computation:

s = ut + [1/2]gt²

s = (0)(6) + [1/2][9.8][6²]

s = 176.4 m

Total height (s) = 176.4 m