Copernicus's model states that the sun is in the center, and that the planets move around it in a circle. Kepler's first law of planetary motion says that they move around the sun in an ellipse.
Answer: velocity of the car is 113.33m/s
Explanation:
From Doppler effect,
in the case which the source is moving towards the observer at rest
f2 = v/(v-vs) *f1
where f2 is the final observed frequency
f1 is the initial observed frequency
v = 340m/s (speed of sound in air)
vs = velocity of the source of sound.
rearranging the above equation
f2*(v - vs) = f1* v
vs = (f1* v/f2) - v
but f1 = 80Hz
f2 = 60Hz
v = 340m/s
substituting,
vs = (80 x 340)/60 - 340
vs = 453.33 - 340
vs = 113.33m/s
velocity of the car is 113.33m/s
Well the similarity is that even though they are in a different state of matter they still come from the same substance: h2o
that is an example of negative acceleration because it is slowing down
Answer:
23 m
Explanation:
If acceleration is uniform then
distance = ( average velocity ) × time
= ( (initial velocity +final velocity )/2 ) × time
= (( 1.5 + 1.0) /2 ) × 18.4
= ( 2.5/2 ) × 18.4
= 1.25× 18.4
= 23 m
