What is the Reading on Each Spring Scale? (Give Your Answers in Newtons)

To solve the problem, we need to determine the reading on each spring scale in Newtons. The scales are calibrated in both grams and Newtons, so we can use either unit to find the answer. Here's a step-by-step explanation for each scale:

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Step 1: Understand the Calibration

Each spring scale has markings for both grams and Newtons. The relationship between grams and Newtons is given by:
\[
1 \text{ gram} = 0.0098 \text{ Newtons}
\]
However, the scales already provide direct conversions, so we can read the Newton values directly from the scale.

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Step 2: Analyze Each Scale

#### Scale 1:
- The pointer is at 400 grams.
- From the calibration, 400 grams = 4 Newtons.
- Reading: 4 Newtons

#### Scale 2:
- The pointer is at 150 grams.
- From the calibration, 150 grams = 1.5 Newtons.
- Reading: 1.5 Newtons

#### Scale 3:
- The pointer is at 7 Newtons.
- No further conversion needed since it is already in Newtons.
- Reading: 7 Newtons

#### Scale 4:
- The pointer is at 14 Newtons.
- No further conversion needed since it is already in Newtons.
- Reading: 14 Newtons

#### Scale 5:
- The pointer is at 30 grams.
- From the calibration, 30 grams = 0.3 Newtons.
- Reading: 0.3 Newtons

#### Scale 6:
- The pointer is at 7.5 Newtons.
- No further conversion needed since it is already in Newtons.
- Reading: 7.5 Newtons

#### Scale 7:
- The pointer is at 300 grams.
- From the calibration, 300 grams = 3 Newtons.
- Reading: 3 Newtons

#### Scale 8:
- The pointer is at 3.5 Newtons.
- No further conversion needed since it is already in Newtons.
- Reading: 3.5 Newtons

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Step 3: Summarize the Answers

Here are the readings for each scale in Newtons:
1. 4 Newtons
2. 1.5 Newtons
3. 7 Newtons
4. 14 Newtons
5. 0.3 Newtons
6. 7.5 Newtons
7. 3 Newtons
8. 3.5 Newtons

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Final Answer:

\[
\boxed{4, 1.5, 7, 14, 0.3, 7.5, 3, 3.5}
\]