If two waves with EQUAL amplitudes and wavelengths travel through a medium in such a way that a particular of the medium is the crest of one wave and at the trough of the other wave at the same time, what will happen to that particle?

Answer:

Measures a slower course of time

Explanation:

According to the theory of relativity, there is a difference in the time measured by two observers, due to a relative speed difference between them. In other words, you observe that a clock that moves with respect to you will measure a slower course of time than a clock that is at rest in your frame of reference.

The object falling near the Earth's surface is rarely under free fall because of the air resistance experienced by the body.

Explanation:

According to the Newton's law of gravitation, each and every body applies an attractive force on another body kept at a particular distance. This force experienced by the body is directly proportional to the product of the masses of the body and inversely proportional to the square of distance between them.

The Earth also pulls the body towards it by the action of the attractive gravitational force. When a body falls towards the Earth under the action of the gravitational force, it moves with an acceleration. The acceleration of the body when it falls freely under the action of gravity is termed as the free fall.

The earth's atmosphere plays a significant role in the motion of the object as it falls under the gravity. The air resistance experienced by the object reduces the acceleration of the object and therefore, the object is no longer under the free fall.

Thus, The object falling near the Earth's surface is rarely under free fall because of the air resistance experienced by the body.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Acceleration

Keywords:

object, acceleration, gravitation, rarely, free, fall, gravitation, newton's, air, resistance, atmosphere, object.

Answer: Earth is around 150,000,000 km far from the Sun.

Explanation:

Earth is the third planet in Our Solar System which revolves around the Sun.

The distance of Earth from Sun is 149.6 million kilometers which can be approximated to 150 million km.

Using the conversion factor:

Now, converting 150 million km to kilometers, we get:

Hence, Earth is around 150,000,000 km far from the Sun.

Speed of the race car at the end of the run is 97.57 m/s

Explanation:

We have equation of motion v² = u² + 2as

Initial velocity, u = 0 m/s  

Acceleration, a = 11.9 m/s²  

Final velocity, v = ?

Displacement,s = 400 m

Substituting  

v² = u² + 2as

v² = 0² + 2 x 11.9 x 400

v = 97.57 m /s

Speed of the race car at the end of the run is 97.57 m/s

Final answer:

Pete's speed can be calculated using the formula for speed which is distance divided by time. He covers a distance of 150 meters in 18 seconds, resulting in a speed of approximately 8.3 meters per second.

Explanation:

To calculate Pete's speed in meters per second, we can use the formula for speed which is given by distance/time. In this case, the distance that Pete covers is 150 meters, and the time he takes is 18 seconds. So, we divide 150 by 18 to get Pete's speed. When we perform this calculation, we obtain a speed of approximately 8.3 meters per second. Therefore, the correct option is (a) 8.3 m/s.

This equation allows us to calculate the speed for any given distance and time and is an essential component of physics and many real-world situations such as determining travel times, planning routes, and even in sporting events to measure performance.

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