A duck is 12 m from the edge of a pond. A student stands in the middle of the pondand creates ripples that travel past the duck and towards the edge of the pond. The
ripples are produced uniformly at 2 ripples per second. The student determines that
the ripples take 3.0 seconds after they pass the duck to reach the edge of the pond.
Determine the wavelength of the ripples.

Answer:

(D). It is easier to compare measurements when using the same unit system.

Explanation:

Kilograms are the standard unit of mass in the metric system, while pounds are the standard unit of mass in the imperial system.

The two systems are not directly convertible, so it would be difficult to compare measurements made in different units.

Therefore, the teacher requires that the students make their measurements in kilograms to simplify the comparison of their results.

So, answer (D). It is easier to compare measurements when using the same unit system.

Let's see the other option:

• Choice (A) is incorrect because a kilogram is not larger than a pound. A kilogram is equal to about 2.2 pounds.
• Choice (B) is incorrect because accurate measurements can be made in pounds.
• Choice (C) is incorrect because pounds can be converted to kilograms. The conversion factor is 1 kilogram = 2.2 pounds.

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Answer:

Choice D

Explanation:

The correct answer is (Choice D) It is easier to compare measurements when using the same unit system.

When conducting scientific experiments or measurements, it is crucial to maintain uniformity in the units of measurement to facilitate accurate comparisons and analysis. By requiring all students to measure the masses of rocks in kilograms, the teacher ensures consistency and eliminates any potential confusion that may arise from using different unit systems.

Using the same unit system allows for straightforward comparisons and calculations without the need for converting between units. It simplifies data analysis and interpretation, which is crucial for scientific accuracy and understanding. By standardizing the unit of measurement to kilograms, the students can directly compare the masses of rocks and draw meaningful conclusions from their data.

To find the vector that is equivalent to a vector of 12 Newtons at 75 degrees south of west, we need to determine the direction and magnitude of the equivalent vector.

The equivalent vector will have the same magnitude of 12 Newtons but a direction that is 180 degrees opposite to the given vector.

The given vector is 75 degrees south of west, which means it is pointing towards the south but slightly to the west.

Therefore, the direction of the equivalent vector will be 75 degrees north of east (opposite direction).

Among the given options:

a) 12 N at 15 degrees west of south - This is not the correct direction.

b) 12 N at 15 degrees south of east - This is not the correct direction.

c) 12 N at 15 degrees north of east - This is the correct direction.

d) 12 N at 15 degrees south of west - This is not the correct direction.

Therefore, the vector that is equivalent to the given vector is option c) 12 N at 15 degrees north of east.

The answer to this problem is "OPTION C" i.e. The pieces will repel because the cut end of the top magnet is a south pole.

A magnet as a collection of tiny magnets, called magnetic domains. Each of these domain reinforces the magnetic fields of the other domains and hence the net magnetic field of magnet is generated. Each one of these domains have a tiny north and south pole. If you cut a magnet in half (along the line suggested in the problem), the newly cut faces will become the new north or south poles of the divided parts.

Answer:

c

Explanation: