sound of thunder takes some time to reach you after you see the lignung.
Can you answer why this happens ?
Measure this time interval using a digital wrist watch or a stop watch.
Calculate the distance of the nearest point of lightning. (Speed of sound in air
= 346 m s.)
Questions
1. Distinguish between speed and velocity
2. Under what condition(s) is the magnitude of average velocity of an object equal to
its average speed?
3. What does the odometer of an automobile measure?
4. What does the path of an object look like when it is in uniform motion?
5. During an experiment, a signal from a va eship reached the ground station in five.
minutes. What was the distance of the spareship from the ground station?
The signál travels at the speed of light, that is, 3x10ms
Example 1.2 The odometer of a car reads 2000 km at the start of a trip and 2400 km at
the end of the trip. If the trip took 8 h, calculate the average speed of the car in kmh and
ms?
Sol,Distance covered by the car,
s = 2400 km - 2000 km = 400 km
Time elapsed, t = 8 h
Answers
Answer:
you have given the answer
Explanation:
1...The sound of thunder takes sometime to reach you after you see the lightning. Why ? This is because light travels faster than sound. So you first see the lightning and then hear the thunder.
The reason is simple. Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
2...we prefer stop watch to measure time interval
3..
we have relationship between the speed distance and time distance travelled = speed × time taken the units being used have to consistent ......
4..Average velocity would be equal to average speed when the total distance travelled equals the net displacement of a particle. This happens when a particle moves along a straight line in a fixed direction.
5...What Does the Odometer of an Automobile Measure? Odometer, or odograph, is a device that measures the distance travelled by an automobile based on the perimeter of the wheel as the wheel rotates.
ANSWER
Let the distance between the spaceship and the ground station be 'S' .
Then, S=vt
where, v= speed of signal =3×10
8
m/s
t= time taken =5min=5×60s=300s
∴s=3×10
8
×300=9×10
10
m
6...