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
Iteru [2.4K]
2 years ago
15

A typical meteor that hits the earth's upper atmosphere has a mass of only 2.5 g, about the same as a penny, but it is moving at

an impressive 40 km/s. As the meteor slows, the resulting thermal energy makes a glowing streak across the sky, a shooting star. The small mass packs a surprising punch.
At what speed would a 900 kg compact car need to move to have the same kinetic energy?
Physics
1 answer:
attashe74 [19]2 years ago
8 0

Answer:

Answer:u=66.67 m/s

Explanation:

Given

mass of meteor m=2.5 gm\approx 2.5\times 10^{-3} kg

velocity of meteor v=40km/s \approx 40000 m/s

Kinetic Energy of Meteor

K.E.=\frac{mv^2}{2}

K.E.=\frac{2.5\times 10^{-3}\times (4000)^2}{2}

K.E.=2\times 10^6 J

Kinetic Energy of Car

=\frac{1}{2}\times Mu^2

=\frac{1}{2}\times 900\times u^2

\frac{1}{2}\times 900\times u^2=2\times 10^6  

900\times u^2=4\times 10^6

u^2=\frac{4}{9}\times 10^4

u=\frac{2}{3}\times 10^2

u=66.67 m/s

You might be interested in
What test is an aptitude test
mars1129 [50]

An aptitude test is a systematic means of testing a job candidate's abilities to perform specific tasks and react to a range of different situations. The tests each have a standardised method of administration and scoring. The results are quantified and compared with all other test takers.

6 0
2 years ago
Read 2 more answers
A loop of wire is carrying current of 2 A . The radius of the loop is 0.4 m. What is the magnetic field at a distance 0.09 m alo
HACTEHA [7]

Answer:

B=2.91\ \mu T

Explanation:

Given that,

The current in the loop, I = 2 A

The radius of the loop, r = 0.4 m

We need to find the magnetic field at a distance 0.09 m along the axis and above the center of the loop. The formula for the magnetic field at some distance is given as follows :

B=\dfrac{\mu_o}{4\pi }\dfrac{2\pi r^2 I}{(r^2+d^2)^{3/2}}

Put all the values,

B=10^{-7}\times \dfrac{2\pi \times 0.4^2 \times 2}{(0.4^2+0.09^2)^{3/2}}\\\\=2.91\times 10^{-6}\ T\\\\or\\\\B=2.91\ \mu T

So, the required magnetic field is equal to 2.91\ \mu T.

3 0
2 years ago
Which statement correctly describes gravity?
Advocard [28]

Answer:

a force that attracts matter to the earth

Explanation:

depends on where you are the gravity can be different in space there is no gravity on Earth there is , that's why when you jump you come back down

5 0
2 years ago
A bicycle rider travels 50.0 Km in 2.5 hours. What is the cyclist's average speed?
vekshin1
<span>If you divide the numbers you will get on average of 20km</span>
5 0
3 years ago
Read 2 more answers
Which of these experiments would make use of qualitative data
7nadin3 [17]
It has to due with numbers so I would say the last one!
5 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following is not a type of plate boundary
    14·2 answers
  • Two college students are sliding down a hill on excellent sleds so you can ignore friction. One has a mass of 85 kg and one has
    14·1 answer
  • How does the yarn in the sweater differ from the wool on the sheep
    11·2 answers
  • A circuit contains a resistor in series with a capacitor, the series combination being connected across the terminals of a batte
    13·1 answer
  • What determines the strength of the force of gravity: the mass or the volume of an object? why?
    10·2 answers
  • why it is not possible to determine drift velocity of electron by timing its travel through conductor.
    6·1 answer
  • One of the purposes of an experiment is to determine whether the dependent variable affects the independent variable. Please sel
    11·2 answers
  • A stargazer has an astronomical telescope with an objective whose focal length is 195 cm and an eyepiece whose focal length is 1
    11·1 answer
  • During the French and Indian war France and Great Britain fought for control of north American territory what impacted the end o
    7·1 answer
  • David is running laps around his apartment complex. Each lap is 1000 m. Starting from his front door and ending at his front doo
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!