Answer:
The speed of sound in air when the temperature is 20°C is 343 m/s.
Explanation:
Given that,
Temperature T = 20°C = 20+273=293 K
The speed of sound in air is the distance traveled divided by time.
We know that,
The relation between the speed of sound in air and temperature is defined as:
Where, T = temperature in Kelvin
v = speed of sound in air
We substitute the value into the formula
The speed of sound in air is 331 m/s at 0° C, 343 m/s at 20°C and 346 m/s at 25°C.
Hence, the speed of sound in air when the temperature is 20°C is 343 m/s.
Answer:
Mechanical advantage = 3
Explanation:
You exert a 100-N force on a pulley system to lift 300-N.
The mechanical advantage of the system is given by the ratio of output force to the input force.
Here, output force = 300 N and input force = 100 N
Mechanical advantage,
Mechanical advantage is 3 it means that there are 3 sections of rope support. Hence, this is the required solution.
An unbalanced force is required to accelerate an object according to Newton's Second Law of Motion.
<h3>What does Newton's Second Law of Motion state?</h3>
It states that the force applied to the object is equal to the product of mass and acceleration.
Therefore, an unbalanced force is required to accelerate an object according to Newton's Second Law of Motion.
Learn more about Newton's Second Law of Motion.: