1. The batteries in a digital alarm clock provide a terminal voltage of 9 V. What is the potential difference across the entire clock current?

A. 4.5 V
B. 18.0 V
C. 9.0 V
D. 6.0 V
**C is my answer

2. Why does the earth have a magnetic declination?
a. the earth's axis of rotation is not constant
b. the magnetic field of the earth is unknown
c. its magnetic poles shift over time and are not aligned to its geographical poles.
d. the north and south poles are improperly named.
**A is my answer

3. If your image is 10.0 m from you in a flat mirror, how far are you standing from the mirror?
A. 10.0 m
B. 20.0 m
C. 1.0 m
D. 5.0 m
**D is my answer

Am I correct? Thank you!!:)

To find the potential difference across the entire clock circuit in question 1, you need to consider the concept of a parallel circuit. In a parallel circuit, the voltage across all components connected in parallel is the same. Since the voltage provided by the batteries is 9 V, the potential difference across the entire clock circuit would also be 9 V. Therefore, your answer, C (9.0 V), is correct.

In question 2, magnetic declination refers to the angle between true north and magnetic north. This angle changes over time because the Earth's magnetic field is not constant. The Earth's magnetic field is generated by the movement of molten iron in its outer core, and this movement is influenced by various factors such as the Earth's rotation and the distribution of minerals in the core. Consequently, the magnetic north and south poles can shift over time and are not aligned with the geographical poles. Therefore, your answer, C (its magnetic poles shift over time and are not aligned to its geographical poles), is correct.

For question 3, when you look into a flat mirror, the distance between your image and the mirror is equal to the distance between you and the mirror. This is known as the distance between the object and its image. Therefore, if the image is 10.0 m from you, you would also be standing 10.0 m from the mirror. Therefore, your answer, A (10.0 m), is incorrect.

To summarize, your answers are as follows:
1. Correct (C)
2. Correct (C)
3. Incorrect (A)