According to her friends, with what speed was ball 2 thrown?
In the context of relative velocity, Ball 1 was thrown with a speed of 21 m/s and Ball 2 was thrown with a speed of 11 m/s according to her friends.
The problem presented involves the concept of relative velocity. The speed of the balls relative to Anita is 16 m/s and she is running at a speed of 5 m/s.
If ball 1 is thrown in the same direction as Anita is running, then the friends on ground would see the speed of the ball as the sum of its velocity relative to Anita and the speed of Anita. So, the speed of ball 1 would be 16 m/s + 5 m/s = 21 m/s. Ball 1 was thrown with a speed of 21 m/s according to her friends.
For Ball 2, if it's thrown in the opposite direction to which Anita is running, then according to her friends the speed of Ball 2 would be 16 m/s (speed of the ball relative to Anita) - 5 m/s (Anita's speed) = 11 m/s. Therefore, Ball 2 was thrown with a speed of 11 m/s according to her friends.
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True IF the engine is 25% efficient. False otherwise.
Answer:
Explanation:
Newton's law of gravitation states that every particle of matter attracts any other particle in the universe with a force directly proportional to the product of there masses and inversely proportional to the square of the distance between them.
This law is also called universal law because it is applicable to all masses at all distances irrespective of the medium.
2) Will the image be erect or inverted?
3) Will the image be enlarged, diminished, or the same size?
4) What kind of mirror is this?
Answer:
1) Image is formed at B
2) The image is an inverted real image
3) The image is a diminished image
4) The mirror is a concave mirror.
Explanation:
According to the diagram, object placed at this point in front of the curved mirror (concave) is placed beyond the center of curvature of the mirror.
To form images by an object placed in front of a curved mirror, ray diagrams are used.
According to the diagram, the first ray from the object incidented on the mirror and parallel to the principal axis converges at the focus (f) after reflection. The second incident ray pass through the focus and then reflect back with reflected ray parallel to the principal axis.
The two reflected ray intersects back at a point B according to the diagram and the image will be formed at that point B with the image head pointing towards the point of intersection.
According to the diagram above, the image will be formed at B and the nature of the image will be inverted, real, diminished (smaller than the object) and formed between the center of curvature and the focus of the mirror.
The mirror in the diagram is a concave mirror since the plane surface of the mirror is bent inwards.
Answer:
24 hours
Explanation: