–0.05 m/s
Explanation:
The total momentum of the system player+basketball must be conserved before and after the ball has been thrown.
Before throwing the ball, the total momentum of the system is zero, because can assume both the player and the basketball being at rest:
The total momentum after the ball has been thrown is instead the sum of the momenta of the the player and of the basketball:
where
is the player's mass
is the player's velocity
is the ball's mass
is the ball's velocity
For the conservation of momentum, we have
And the negative sign means that the player travels in the opposite direction to the ball.
the friction force provided by the brakes is 30000 N.
<h3>What is friction force?</h3>
Friction force is the force that opposes the motion between two bodies in contact.
To calculate the average friction force provided by the brakes, we apply the formula below.
Formula:
- K.E = F'd............. Equation 1
Where:
- K.E = Kinetic energy of the train
- F' = Friction force provided by the brakes
- d = distance
Make F' the subject of the equation
- F' = K.E/d............ Equation 2
From the question,
Given:
Substitute these values into equation 2
- F' = (8.1 ×10⁶)/270
- F' = 30000 N
Hence, the friction force provided by the brakes is 30000 N
Learn more about friction force here: brainly.com/question/13680415
Explanation :
In Interspecific competition, different individuals of different species fight for the same resource in an ecosystem. The resources can be food or living space.
Birds belong to the group of<em> aves</em>, squirrels and chipmunks are from the family of <em>Sciuridae</em>.
All three are from different species. They are on the same ecosystem i.e. tree. They form the interspecific competitions.
Explanation:
Changes in carbon dioxide have been measured for many years, their volume is expressed in PPM, the abbreviation of Parts Per Million. It means that of every million molecules that a sample of air in our atmosphere contains, the number expressed in this measure will be co2.
