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4 years ago

Physical Science Lesson 4 unit 2 questions, I need the answers

2 answers:

7 0

I know I'm a bit late but just in case you still need some of the answers.

1: Oxygen
2: Change in shape
3: Water breaking down into hydrogen and oxygen
4: I think it's Milk but I might be wrong.

I might be wrong about some of them, sorry it's not much.

lubasha [3.4K]4 years ago

5 0

1- Oxygen

2- Change in shape

3- Water breaking down into hydrogen and oxygen

4- Milk

5-Liquid

6- Solid

7-Physical

8- Chemical property

9- Volume

10- Kinetic Energy

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A 13-kg sled is moving at a speed of 3.0 m/s. At which of the following speeds will the sled have twice as much kinetic energy?

AysviL [449]

K.E. = 1/2 mv²
K.E. is directly proportional to v^2
So, when K.E. increase by 2, K.E. increase by root. 2
v' = 1.41v
original v value was 3 so, final would be:
v' = 1.41*3 = 4.23
After round-off to it's tenth value, it will be:
v' = 4.2

So, option B is your answer!

Hope this helps!

7 0

3 years ago

Thoughts about Genetically Modified Crops

Alex787 [66]

I think that GMOs, also known as genetically modified crops or organisms, can be used in good and bad ways. They can provide crops to survive longer, and produce a bigger portion. However, on the other side of that, it is claimed that it creates a large amount of greenhouse gas emissions, which can turn into climate change.

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3 years ago

Read 2 more answers

Q1. In a 100m track event, the time taken by four runners is 10 sec., 10.2 sec., 10.4 sec and 10.6 sec. Find the ratio of their

Anna35 [415]

Distance (s)=100m
time
T₁=10
T₂=10.2
T₃=10.4
T₄=10.6
by v= $\frac{s}{t}$
we get
V₁= $\frac{100}{10}$
V₁=10m/s

V₂= $\frac{100}{10.2}$
V₂=9.8m/s

V₃= $\frac{100}{10.4}$
V₃=9.61 m/s

V₄= $\frac{100}{10.6}$
V₄=9.43 m/s

V₁:V₂:V₃:V₄ = 10 : 9.8 : 9.61 : 9.43

8 0

3 years ago

An ice skater at rest pushes against a sled at rest,causing both the skater and sled to move away from each other with different

astraxan [27]

Answer:

Newton's third law of motion.

Explanation:

An ice skater at rest pushes against a sled at rest,causing both the skater and sled to move away from each other with different acceleration. It is based on Newton's third law of motion.

Third law says that, for every action there is an equal; and opposite reaction. Here, action is force applied by ice skater and reaction is motion of skater and sled away from each other with different acceleration.

3 0

3 years ago

A gymnast weighs 450 N. She stands on a balance beam of uniform construction which weighs 250 N. The balance beam is 3.0 m long

Damm [24]

Answer:

x = 9.32 cm

Explanation:

For this exercise we have an applied torque and the bar is in equilibrium, which is why we use the endowment equilibrium equation

Suppose the counterclockwise turn is positive, let's set our reference frame at the left end of the bar

- W l / 2 - W_{child} x + N₂ l = 0

x = $\frac{-W l/2 + n_2 l}{W_{child}}$ 1)

now let's use the expression for translational equilibrium

N₁ - W - W_(child) + N₂ = 0

indicate that N₂ = 4 N₁

we substitute

N₁ - W - W_child + 4 N₁ = 0

5 N₁ -W - W_{child} = 0

N₁ = ( W + W_{child}) / 5

we calculate

N₁ = (450 + 250) / 5

N₁ = 140 N

we calculate with equation 1

x = -250 1.50 + 4 140 3) / 140

x = 9.32 cm

7 0

3 years ago