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
madreJ [45]
3 years ago
13

An older-model car accelerates from 0 to speed v in a time interval of δt. a newer, more powerful sports car accelerates from 0

to 5v in the same time period. assuming the energy coming from the engine appears only as kinetic energy of the cars, compare the power of the two cars.
Physics
1 answer:
Marysya12 [62]3 years ago
8 0
Power = Energy / time = Δ kinetic energy / time = ΔKE / t

For old car: ΔKE= m(v^2) / 2 => Power = m(v^2) / (2t)


For new car: ΔKE = m (5v)^2 / 2 => Power = 25 * [ m(v^2) / (2t) ]

Then, comparing the expressions for both cars, you get that the power of the new car is 25 times the power of the old car. 
You might be interested in
In a popular classroom demonstration, a cotton ball is placed in the bottom of a strong test tube. A plunger fits inside the tub
mario62 [17]

Answer:

An increase in air temperature because of its compression.

Explanation:

The Gay-Lussac's Law states that a gas pressure is directly proportional to its temperature in an enclosed system to constant volume.  

P = kT  

<em>where P: is the gas pressure, T: is the gas temperature and k: is a constant.</em>

Therefore, due to Gay-Lussac's Law, when the plunger is pushed down very rapidly, the pressure of the air increase, which leads to its temperature increase. That is why cotton flashes and burns.      

I hope it helps you!

3 0
3 years ago
Atoms in Group 18 elements are inert (chemically unreactive) because ___________________________. A they combined to form molecu
Rom4ik [11]

When you say full valence shell, are you talking about a valence electron shell?

I am learning about atoms and i know a little bit

6 0
3 years ago
Read 2 more answers
Some populations have cooperative relationships. This is where:
Ilia_Sergeevich [38]
C. Members of the same species work together for survival
5 0
2 years ago
A rock with a mass of 540 g in air is found to have an apparent mass of 342 g when submerged in water. (a) What mass of water is
AleksandrR [38]

(a) 198 g

When the rock is submerged into the water, there are two forces acting on the rock:

- its weight, equal to W=mg (m=mass, g=acceleration of gravity), downward

- the buoyant force, equal to B=m_w g (m_w=mass of water displaced), upward

So the resultant force, which is the apparent weight of the rock (W'), is

W'=W-B

which can be rewritten as

m'g = mg-m_w g

where m' is the apparent mass of the rock. Using:

m = 540 g

m' = 342 g

we find the mass of water displaced

m_w = m-m'=540 g-342 g=198 g

(b) 1.98\cdot 10^{-4} m^3

If the rock is completely submerged, the volume of the rock corresponds to the volume of water  displaced.

The volume of water displaced is given by

V_w = \frac{m_w}{\rho_w}

where

m_w = 198 g = 0.198 kg is the mass of the water displaced

\rho_w = 1000 kg/m^3 is the density of the water

Substituting,

V_w = \frac{0.198}{1000}=1.98\cdot 10^{-4} m^3

And so this is also the volume of the rock.

(c) 2727 kg/m^3

The average density of the rock is given by

\rho = \frac{m}{V}

where

m = 540 g = 0.540 kg is the mass of the rock

V=1.98\cdot 10^{-4} m^3 is its volume

Substituting into the equation, we find

\rho = \frac{0.540 kg}{1.98\cdot 10^{-4}}=2727 kg/m^3

3 0
3 years ago
Give three examples of objects in equilibrium found in classroom?​
Charra [1.4K]

Answer:

Book. Bottle. table are some examples of objects in equilibrium found in classroom

7 0
2 years ago
Other questions:
  • Can you please help me with #9?
    12·1 answer
  • One alternative to burning non-renewable fuels, which harm the environment, could be to burn (2 points) biomass. coal. natural g
    5·2 answers
  • A star is a ___ that emits energy produced by nuclear reactions in its interior.
    14·1 answer
  • What is the length of the Mr. Freeze roller coaster launch rail?
    10·1 answer
  • Police radar guns measure the speed of moving vehicles by transmitting electromagnetic waves at a vehicle and detecting a Dopple
    13·1 answer
  • HELP PLEASE NEED IT TO BE RIGHT
    7·2 answers
  • Hello:)!<br> I don’t really understand the uniform deceleration too :/
    5·1 answer
  • What's true about the elliptical path that the planets follow around the sun? A. A line can be drawn from the planet to the sun
    14·1 answer
  • Rony fills a bucket with water and whirls it in a vertical circle to demonstrate that the water will not spill from the bucket a
    5·1 answer
  • How would you describe the atmosphere to a friend.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!