Answer:
A fair test.
Explanation:
Hi, a fair test is used to do scientifically valuable experiments, is a controlled investigation to answer a scientific question.
In a fair test two or more things are compared.
It consists in changing only one factor (the one bieng tested) and keeping all the other conditions the same during an experiment.
The factor is called a variable.
Answers:
a) -2.54 m/s
b) -2351.25 J
Explanation:
This problem can be solved by the <u>Conservation of Momentum principle</u>, which establishes that the initial momentum
must be equal to the final momentum
:
(1)
Where:
(2)
(3)
is the mass of the first football player
is the velocity of the first football player (to the south)
is the mass of the second football player
is the velocity of the second football player (to the north)
is the final velocity of both football players
With this in mind, let's begin with the answers:
a) Velocity of the players just after the tackle
Substituting (2) and (3) in (1):
(4)
Isolating
:
(5)
(6)
(7) The negative sign indicates the direction of the final velocity, to the south
b) Decrease in kinetic energy of the 110kg player
The change in Kinetic energy
is defined as:
(8)
Simplifying:
(9)
(10)
Finally:
(10) Where the minus sign indicates the player's kinetic energy has decreased due to the perfectly inelastic collision
Answer:
Nitrogen and oxygen are by far the most common; dry air is composed of about 78% nitrogen (N2) and about 21% oxygen (O2). Argon, carbon dioxide (CO2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere's mixture of gases.
Answer: Leandra puts on her mittens because if you do not you will burn your self, due to extremely high temperatures.
Explanation:
Answer:
The magnitude of the tangential velocity is 
The magnitude of the resultant acceleration at that point is 
Explanation:
From the question we are told that
The mass of the uniform disk is 
The radius of the uniform disk is 
The force applied on the disk is 
Generally the angular speed i mathematically represented as

Where
is the angular displacement given from the question as


is the angular acceleration which is mathematically represented as

The moment of inertial is mathematically represented as

Substituting values


Considering the equation for angular acceleration

Substituting values



Considering the equation for angular velocity

Substituting values


The tangential velocity of a given point on the rim is mathematically represented as

Substituting values


The radial acceleration at hat point is mathematically represented as


The tangential acceleration at that point is mathematically represented as

Substituting values


The magnitude of resultant acceleration at that point is

Substituting values

