1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
inna [77]
3 years ago
8

If it takes 10 seconds for a car to reach its top speed of 100 miles per hour, its acceleration would be. Help please

Physics
1 answer:
hjlf3 years ago
4 0

Answer:

36000 miles/h^{2} or 0.0028 miles/s^{2}

Explanation:

Acceleration is rate of change of speed per unit time. The change in speed is given by deducting the initial speed from final speed. Assuming that the car starts from rest to a top speed of 100 miles per hour, then the change in speed is equivalent to 100-0=100 miles per hour.

Time is given in seconds and converting to hours will be 10/3600

The acceleration will then be

\frac {100*3600}{10}=36000 miles/h^{2}

Alternatively, the change in speed xould be converted to miles per second hence 100/3600 miles per second divided by 10 s then a=\frac {100}{36000}=0.0027777777777 m/s^{2} rounded off as 0.0028 miles/s^{2}

You might be interested in
Microscopes are often equipped with blue filters. give a reason for using blue light in a microscope
timama [110]
The blue light removes red parts of the color spectrum giving it a cooler color

8 0
3 years ago
A child whose weight is 287 N slides down a 7.20 m playground slide that makes an angle of 31.0° with the horizontal. The coeff
natulia [17]

Answer:

a

H  =212.6 \  J

b

v  =  7.647  \  m/s

Explanation:

From the question we are told that

   The child's weight is  W_c  =  287 \ N

    The length of the sliding surface of the playground is  L =  7.20 \  m

    The coefficient of friction is  \mu =  0.120

      The angle is \theta = 31.0 ^o

      The initial  speed is  u =  0.559 \  m/s

Generally the normal force acting on the child is mathematically represented as

=>    N  =  mg  *  cos \theta

Note  m *  g  =  W_c

Generally the frictional force between the slide and the child is    

         F_f  =  \mu *  mg  *  cos \theta

Generally the resultant force acting on the child due to her weight and the frictional  force is mathematically represented as

      F =m* g sin(\theta) - F_f

Here  F is the resultant force and it is represented as  F =  ma

=>   ma =   m* g sin(31.0)  - \mu *  mg  *  cos (31.0)

=>   a =  g sin(31.0)-  \mu *  g  *  cos (31.0)

=>  a =    9.8 *  sin(31.0) - 0.120 *  9.8  *  cos (31.0)

=>a =  4.039 \ m/s^2

So

   F_f  =  0.120  * 287  *  cos (31.0)

=> F_f  = 29.52 \  N

Generally the heat energy generated by the frictional  force which equivalent tot the workdone by the frictional force  is mathematically represented as

     H  =  F_f  * L

=>  H  = 29.52 *  7.2

=>  H  =212.6 \  J

Generally from kinematic equation we have that

    v^2  =  u^2  +  2as

=>  v^2  =  0.559^2  +  2 * 4.039 * 7.2

=>  v  =  \sqrt{0.559^2  +  2 * 4.039 * 7.2}

=>  v  =  7.647  \  m/s

   

6 0
3 years ago
Excellent human jumpers can leap straight up to a height of
Firlakuza [10]

For a human jumper to reach a height of 110 cm, the person will need to leave the ground at a speed of 4.65 m/s.  

We can calculate the initial speed to reach 110 cm of height with the following equation:

v_{f}^{2} = v_{i}^{2} - 2gh

Where:

v_{f}: is the final speed = 0 (at the maximum height of 110 cm)

v_{i}: is the initial speed =?

g: is the acceleration due to gravity = 9.81 m/s²

h: is the height = 110 cm = 1.10 m

Hence, the <u>initial velocity</u> is:

v_{i} = \sqrt{v_{f}^{2} + 2gh} = \sqrt{2*9.81 m/s^{2}*1.10 m} = 4.65 m/s

Therefore, the initial speed that the person must have to reach 110 cm is 4.65 m/s.

You can see another example here: brainly.com/question/13359681?referrer=searchResults

I hope it helps you!

4 0
2 years ago
Explain how smoking damages the respiratory system and name two conditions that can develop when a person smokes. ribe the locat
kipiarov [429]

Answer

Explanation:

Smoking can cause lung disease by damaging your airways and the small air sacs (alveoli) found in your lungs. Lung diseases caused by smoking include COPD, which includes emphysema and chronic bronchitis. Cigarette smoking causes most cases of lung cancer.

6 0
3 years ago
Read 2 more answers
What does AS&gt;0 mean?|<br> I
tigry1 [53]

Answer:

Significant Other

Explanation:

that comes to mind when I see that

5 0
3 years ago
Read 2 more answers
Other questions:
  • A particle of charge +13 µC and mass 3.57 10-5 kg is released from rest in a region where there is a constant electric field of
    14·1 answer
  • Skateboard A Force: 33 N Time: 0.12 s Skateboard B Force: 33 N Time: 0.57 s Skateboard C Force: 33 N Time: 0.78 s Which skateboa
    9·2 answers
  • What is one key physical difference between transition metals and poor metals?
    12·1 answer
  • According to Coulomb's law, when the distance between two point charges doubles, what happens to the electric force acting betwe
    5·1 answer
  • lock of mass m2 is attached to a spring of force constant k and m1 . m2. If the system is released from rest, and the spring is
    7·1 answer
  • Calculate the kinetic energy of an 88-kg scooter moving at 10 m/s . express your answer to two significant figures and include t
    8·2 answers
  • A 400.0-m-wide river flows from west to east at 30.0 m/min. Your boat moves at 100.0 m/min relative to the water no matter which
    15·1 answer
  • - 4x4 – 13x3 + 8x2 – 21x + 18 is divided by 2 – 3?
    13·2 answers
  • Which element would most likely form an lonic bond with nitrogen (N)?<br> 0<br> Р<br> c<br> к
    12·1 answer
  • Animal-vehicle collisions can happen any time of the year, but_______ is the peak season for deer- car collisions.
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!