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Ganezh [65]
2 years ago
5

Please tell me if if these statements are true or false

Physics
2 answers:
alex41 [277]2 years ago
6 0

Answer:

Im not sure if im right but this is what i got( i have no clue how to explain im sorry)

1. False

2. False

3. True

4. False

adelina 88 [10]2 years ago
6 0
1. False- light usually doesn’t cause changes to certain materials.

2. True (I think) I don’t really know how to explain this one

3. False- Not all light can be seen especially when light can travel

4. False- Certain hard materials light won’t be able to go through because of its density.

Sorry about the 2nd one and I’m not 100% on this but hope this helps.
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Balance the following equations: CUCO3+H2SO4- CUSO4+H2O+CO2​
Setler79 [48]

Answer:

It is already balanced

Explanation:

It is already balanced

6 0
3 years ago
You observe two cars traveling in the same direction on a long, straight section of Highway 5. The red car is moving at a consta
Arte-miy333 [17]

Answer:

1)  3.66 s

2) 124.44 m

3) 3.12 s

Explanation:

Let's start by first listing down the information in the question.

Red Car : 34 m/s

Blue Car: 28 m/s

Distance between them : 22 m

The difference in speed between the cars is: 34 - 28 = 6 m/s

This means that the red car is catching up to the blue car at a speed of 6 m/s.

1) We can solve this by just dividing the distance by the difference in speed. This becomes:    \frac{Distance}{Speed}= \frac{22}{6} =   3.66

Thus it takes 3.66 seconds for the red car to catch up to the blue car.

2) We know from (1) that it took 3.66 seconds for the red car to catch up. Since the speed it was travelling at is constant, we only need to multiply it by the time from (1) to get the distance.

This becomes:    Speed * Time = 34 * 3.66 = 124.44

Thus the red car travels 124.44 m before catching up to the blue car.

3) If the red car starts to accelerate the moment we see it, the time taken to get to the blue car will be less than before. We can find this in a simple way.

We can use the motion equation : s = u*t + \frac{1}{2}(a * t^2)

Here s = 22 m

We can take u as the difference in speed. u = 6 m/s

Acceleration a = (2/3) m/s^2

Substituting the these into the equation we get:

22 = 6t + \frac{1}{2}(\frac{2}{3}t^2)

Solving this for the variable 't' using the quadratic formula we get the following two answers:

t1  = 3.12 s

t2 = - 21.12 s

Since t2 is not possible, the answer is t1. This means it takes 3.12 seconds for the red car to catch up to the blue.

4 0
3 years ago
7. Which of the following is NOT always true about a synthesis reaction!
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Answer:

C

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the formula is a + b = ab

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D
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What is the most appropriate tool to use when collecting data from the investigation
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