Answer:
The temperature of steel first becomes 12 MPa at a temperature of 18.65°C
Explanation:
Given that,
Diameter = 50 mm
Temperature = 15°C
Diameter = 10 mm
Stress = 12 MPa
We need to calculate the temperature of steel
Using formula of stress
Where, Y = young modulus
T = temperature
= coefficient of linear expansion of the material
Put the value into the formula
We need to calculate the temperature of magnesium
Using formula of stress
Put the value into the formula
Hence, The temperature of steel first becomes 12 MPa at a temperature of 18.65°C
Answer:
b. -1.5 m/s²
Explanation:
Given the following data;
Initial velocity = 15m/s
Time = 10 seconds.
Since the car came to rest, final velocity = 0m/s
To find acceleration;
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of final speed from the initial speed all over time.
Mathematically, acceleration is given by the equation;
Where,
a is acceleration measured in 
v and u is initial and final speed respectively, measured in 
t is time measured in seconds.
Substituting into the equation, we have;
Acceleration = -1.5 m/s²
The three main cycles of an ecosystem are the water cycle, the carbon cycle and the nitrogen cycle.
