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nlexa [21]
3 years ago
6

A 2.0-kg object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0-kg object moving with

a speed of 2.0 m/s in the same direction. How much kinetic energy is lost in this collision
Physics
1 answer:
Andrej [43]3 years ago
4 0

Answer:

5.4 J.

Explanation:

Given,

mass of the object, m = 2 Kg

initial speed, u = 5 m/s

mass of another object,m' = 3 kg

initial speed of another orbit,u' = 2 m/s

KE lost after collusion = ?

Final velocity of the system

Using conservation of momentum

m u + m'u' = (m + m') V

2 x 5 + 3 x 2 = ( 2 + 3 )V

16 = 5 V

V = 3.2 m/s

Initial KE = \dfrac{1}{2}mu^2 + \dfrac{1}{2}m'u'^2

              = \dfrac{1}{2}\times 2\times 5^2 + \dfrac{1}{2}\times 3 \times 2^2

              = 31 J

Final KE = \dfrac{1}{2} (m+m')V^2 = \dfrac{1}{2}\times 5 \times 3.2^2 = 25.6 J

Loss in KE = 31 J - 25.6 J = 5.4 J.

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A. If we increase the wind velocity, the maximum vertical dispersal height and rate of diffusion will decrease____.
vovikov84 [41]

Answer:

a.If we increase the wind velocity, the maximum vertical dispersal height will decrease, while the rate of diffusion will increase

b.If we increase the humidity, the maximum vertical dispersal height will increase after 24 hours.

c.If we increase the lapse rate, the maximum vertical dispersal height of the pollutants will increase

Explanation:

a.If we increase the wind velocity, the maximum vertical dispersal height will decrease, while the rate of diffusion will increase

b.If we increase the humidity, the maximum vertical dispersal height will increase after 24 hours.

c.If we increase the lapse rate, the maximum vertical dispersal height of the pollutants will increase

8 0
3 years ago
Read 2 more answers
A football player runs at 8m/s and plows into a 80kg referee standing on the field causing the referee to fly forward at 5m/s. I
madreJ [45]

The topic here is momentum.

When a collision is said to be elastic, it means that the colliding objects now travel at their own new, indivual and distinct velocities, often in different directions.

So we write that as,

(mass of football player x velocity of football player) + (mass of referee x velocity of referee) = (mass of football player x velocity of football player) + (mass of referee x velocity of referee)

(M × 8) + (80 × 0) = (M× 0) + (80 × 5)

8M = 400

M = 50 kg

4 0
3 years ago
Through what potential difference must electrons be accelerated so that they will exhibit wave nature in passing through a pinho
Mila [183]

Answer:

0.15 mV

Explanation:

In order to exhibit wave nature, the de Broglie wavelength of the electron must be of the same size of the diameter of the pinhole, therefore:

\lambda=0.10 \mu m = 1.0\cdot 10^{-7} m

The de Broglie wavelength of an electron is

\lambda = \frac{h}{mv}

where

h=6.63\cdot 10^{-34} Js is the Planck constant

m=9.11\cdot 10^{-31} kg is the mass of the electron

v is the electron's speed

Therefore, the electron's speed must be

v=\frac{h}{m\lambda}=\frac{6.63\cdot 10^{-34}}{(9.11\cdot 10^{-31})(1.0\cdot 10^{-7})}=7278 m/s

When accelerated through a potential difference \Delta V, the kinetic energy gained by the electron is equal to the change in electric potential energy, therefore

e\Delta V = \frac{1}{2}mv^2

where

e=1.6\cdot 10^{-19} is the magnitude of the charge of the electron

So, we can find the potential difference needed:

\Delta V=\frac{mv^2}{2e}=\frac{(9.11\cdot 10^{-31})(7278)^2}{2(1.6\cdot 10^{-19})}=1.5\cdot 10^{-4}V = 0.15 mV

5 0
3 years ago
PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!
Alexandra [31]

Mechanical waves need material stuff to travel through.

They cannot travel through vacuum.

That's why we can't hear the explosions on the sun.

That's also why astronauts standing on the moon or working outside the Space Station have to use radio to talk to each other, even if they're only a few inches apart.  There's no air between them, or any other material stuff.  So sound can't travel between them.

7 0
3 years ago
Read 2 more answers
If you are given time and distance, you can determine power if you know force. watts. energy. joules. Question 7(Multiple Choice
IgorC [24]

<u>Answer</u>

Force.


<u>Explanation</u>

Power is the are of doing work done.

∴ power = (work done) / (time take)    ⇒⇒⇒This time is given.

Work is said to be have done when a force has been used to move an object at a certain distance. work is the product of force and the distance move in the direction of that force.

∴ work done = force × distance     ⇒⇒ This distance is given.


<h3>Power = <em>( force</em> × distance ) / (time taken)</h3>

So, to get power when given time and distance we need force.  



6 0
3 years ago
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