Identify two factors that determine the intensity of sound
1 answer:
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Answer:
a) The uniform velocity travelled by the car is 10 meters per second.
(Point b has been erased by the user)
c) The distance travelled by the car with uniform velocity is 100 meters.
Explanation:
a) Calculate the uniform velocity travelled by the car:
The uniform velocity is the final velocity (), in meters per second, of the the uniform accelerated stage:
(1)
Where:
- Initial velocity, in meters per second.
- Acceleration, in meters per square second.
- Time, in seconds.
If we know that ,
and
, then the uniform velocity is:
The uniform velocity travelled by the car is 10 meters per second.
(Point b has been erased by the user)
c) The distance travelled by the car (), in meters, with uniform velocity is calculated by the following kinematic expression:
(2)
If we know that and
, then the distance travelled is:
The distance travelled by the car with uniform velocity is 100 meters.
Answer:
78.4 J
Explanation:
The gravitational potential energy of the ball (relative to the ground) is given by
where
m = 2 kg is the mass of the ball
g = 9.8 m/s^2 is the acceleration due to gravity
h = 4 m is the height of the ball above the ground
Substituting numbers into the formula, we find