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
vampirchik [111]
3 years ago
10

~~~~NEED HELP ASAP~~~~

Physics
2 answers:
maksim [4K]3 years ago
4 0

the above three pictures may help you

go through the attachments

Softa [21]3 years ago
3 0

Answer:

Block A velocity is 23.33 m/s and the collission is not elastic.

Explanation:

a) m1v1 + m2v2 = m1v1' + m2v2'

Plug in givens

90+60=3v1'+80

solve for v1'= 23.33m/s

b) Find the initial and final kinetic energy of Block B

Ki= 1/2(4)(15)^2 + 1/2(3)(30)^2 = 1800 J

Kf= 1/2(4)(20)^2 + 1/2(3)*(23.33)^2= 1616.433J

Since Ki does not equal Kf the collision is not elastic

You might be interested in
A. Blue light has higher energy than red light. Write 3 - 4 sentences comparing these electromagnetic waves with respect to the
frosja888 [35]

PART A)

As we know that energy of light depends on its wavelength and frequency as following formula

E = \frac{hc}{\lambda} = h\nu

now we know that wavelength of blue light is less than the red light so here energy of blue light will be more

also we know that

\nu = \frac{c}{\lambda}

so here if wavelength is smaller for blue light so its frequency will be high and the speed of both light will be same in same medium

PART B)

Since we know that frequency of blue light is more than red light as well as wavelength of blue light is less than the wavelength of blue light so here blue light will have more energy

When blue light and red light strike the metal surface then due to more energy of blue light it will release some loosely bonded electrons from metal surface which will contribute in current.

here if we increase the intensity of light then the number of photons that contain the blue light of certain energy will be more and that will contribute more current

So here quantification help as we know that due to quantization only certain frequency or energy will lead to eject electron so all colours will not give this current

5 0
3 years ago
Read 2 more answers
How does sound travel through a medium?
Papessa [141]
Particles vibrate parallel to the direction the sound travels. It's a longitudinal wave.
4 0
3 years ago
Read 2 more answers
Which of the following is not an essential feature of scientific explanations?
sineoko [7]

Answer:

D I think I might be wrong its been a while scense I did something like that

4 0
3 years ago
What parts of an atom can change during a nuclear reaction that cannot change during a chemical reaction? Question 15 options: A
viva [34]
Neutrons and protons cannot be removed from nucleus from chemical reactions because they are strongly held together but nuclear reactions are strong enough to separate them. Hence option A is correct.
6 0
3 years ago
Read 2 more answers
Two trains are blowing their whistles. The first train is stationary, and the
Liono4ka [1.6K]

Answer:

A I think

Pls Mark Brainiest, I'm trying to become Virtuoso

3 0
3 years ago
Other questions:
  • A car of mass 1800 kg collides with a truck of mass 5200 kg, and just after the collision the car and truck slide along, stuck t
    7·1 answer
  • What force is required to give an object with mass 2000 kg an acceleration of 3.5 m/s2
    9·2 answers
  • A flat (unbanked) curve on a highway has a radius of 240.0 m m . A car rounds the curve at a speed of 26.0 m/s m/s . Part A What
    10·1 answer
  • Einstein and Lorentz, being avid tennis players, play a fast-paced game on a court where they stand 20.0 m from each other. Bein
    13·1 answer
  • Identify the magnetic north pole of Earth’s magnet?
    6·2 answers
  • When an external magnetic flux through a conducting loop decreases in magnitude, a current is induced in the loop that creates i
    5·1 answer
  • A spring with a spring constant of 34 N/m is stretched 14 m. What is the energy stored in the
    12·2 answers
  • Explain the relationship between mass and change in velocity. You may write
    11·1 answer
  • Science, who ever gets this will get a brainlest
    14·2 answers
  • A series circuit has four resistors. The current through one resistor is 810 mA. How much current is supplied by the source?0.81
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!