Answer:
1.77 N
Explanation:
Mass of bullet m = 1.7 x 10⁻³ kg
velocity v = 380 m /s .
Momentum of one bullet
= 1.7 x 10⁻³ x 380
= 646 x 10⁻³ kg m/s
momentum of 165 bullets
= 165 x 646 x 10⁻³ kg m/s
= 106.59 kg m/s
Final momentum after bouncing
= 0
change in momentum
= 106.59 - 0
= 106.59 kg m/s
This change occurs in one minute
so rate of change in momentum
= 106.59 / 60 kg m/s per second
= 1.77 kg m/s per second
rate of change in momentum = force
This is force on superman's chest
Force required = 1.77 N .
Sulphur (S), Iodine (I) and Magnesium (Mg) are all three, solids at the room temperature. Thus they have the same phase at room temperature.
Sulphur and Iodine are not good conductors of electricity.
Also while Sulphur is in group 6, Magnesium is in group 2. Therefore they do not have the same number of valence electrons. Sulphur is making anions (negative ions) and Magnesium is making cations (positive ions).
The acceleration of the wooden box is 6.17 m/s² towards the west.
<h3 /><h3>What is acceleration?</h3>
Acceleration can be defined as the rate of change of velocity.
To calculate the acceleration of the wooden box can be calculated using the formula below.
Formula:
- F₂-F₁ = ma.................. Equation 1
Where:
- F₂ = Force on the wooden box acting towards west
- F₁ = Force on the wooden box acting towards the east
- m = Mass of the wooden box.
- a = Acceleration of the wooden box
Make a the subject of the equation
- a = (F₂-F₁)/m........................ Equation 2
From the question,
Given:
- F₂ = 270.7 N
- F₁ = 85.7 N
- m = 30 kg
Substitute these values into equation 2
- a = (270.7-85.7)/30
- a = 185/30
- a = 6.17 m/s² towards the west.
Hence, The acceleration of the wooden box is 6.17 m/s² towards the west.
Learn more about acceleration here: brainly.com/question/605631
To find a solution to this problem it is necessary to apply the concepts related to the Reynolds number and its definitions on the type of fluid.
A Reynolds number less than 2000 considers the laminar fluid, while a Reynolds number greater than 4000 is considered a turbulent fluid. (The intermediate between the two values would be a transient fluid)
The mathematical equation that defines the Reynolds number is given by
Where
Density
V= Velocity
D= Diameter
Viscosity
Our values are given as
The velocity can be find through the Discharge equation,
Q = VA
Where
V = Velocity
A = Area
Replacing,
Replacing at the Reynolds equation,
Since Reynolds' number is greater than 4000, then we consider this a turbulent fluid.
Given that they are all on the same bus that is travelling in a straight line at the same velocity, when Elle throws the ball directly upwards, the ball will simply fall back to her. This is because the bus, Elle, and the ball are all travelling in the same direction and at the same speed. Among the choices, the correct answer is A.
