Please Help Me How to Do This

Answers

Answer 1

Answer: A wave has a wavelength of 0.5 meters and a frequency of
120hz.how long would it take for this wave to travel 300 meters.

Neat problem !

If we want to know how long it would take to cover some distance,
we'll need to know its speed.

Wave speed = (wavelength) x (frequency)

   = (0.5 m) x (120 / sec)

   =    60 m/s .

Then ...

   Time = (distance) / (speed)

   = (300 m) / (60 m/s)

   =    5 seconds .

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An actress wears a blue dress. How could you use spot lights to make the dress appear to be black?

Answers

Answer:

Use a yellow (Red + Green) spotlight to make it look black.

Explanation:

The blue fabric has pigments that can absorb the red and green light. This light is incident on the fabric, therefore, there is no light left to be reflected back, so, at plain sight, the dress will look black.

What energy is a wind turbine transferring>?????????????????????????????????????

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The wind-mill is taking kinetic energy out of the moving air that spins it, and uses that energy to do things. It may pump water up out of the ground, it may turn a big stone to grind wheat, or it may turn an electric generator to turn the energy it collects into electrical energy.

Wind Energy &/or kinetic

Transfer into Electrical

Explain why the moon can be seen from earth

Answers

The moon has an orbit around the earth and we can see it at night because of the reflection of the sun's rays and energy that bounce back to the earth. This is what gives the moon the brilliant white glow. It's important to also remember that the earth has a rotation and an orbit around the sun.

The moon can be seen from Earth because the sun's rays hit the moon, causing the light to be reflected by the moon.

In shorter words:

When the sun's rays hit the moon, the light reflects on the moon.

A 40-kg soccer player going through the air at 4m/s collides with a 60-kg player who is headed toward her at 3m/s, in the air. What is the speed and direction of the entangled players? Please explain how to do it

Answers

Answer: The entangled players would move with a speed of 0.2 m/s in the direction direction of the motion of second soccer player.

Explanation:

From law of conservation of momentum,

Initial momentum of the closed system = final momentum of the closed system

Since, no external force is acting on the players, total momentum would be conserved.

m₁u₁+m₂u₂=(m₁+m₂)v

where, m₁ is the mass of one soccer player = 40 kg

u₁ is its initial velocity before collision = 4 m/s

m₂ is the mass of the other soccer player = 60 kg

u₂ is the initial velocity before collision = - 3 m/s (∵opposite direction)

After collision, the two players get entangled and hence move with the same final velocity v.

40 kg × 4 m/s - 60 kg × 3 m/s = (40 kg + 60 kg ) v

160 kg m/s - 180 kg m/s = 100 kg v

v = -0.2 m/s

Hence, the entangled players would move with a speed of 0.2 m/s in the direction direction of the motion of second soccer player.

A bulldozer does 45,000 joules of work to push a boulder a distance of 30 meters.How much force is applied to push the?

Answers

Answer:

1500N

Explanation:

we have ,

w= f*d

45,000 =f * 30

f=45000/30

f=1500N..

How do fission nuclear reactions differ from fusion nuclear reactions? Fission reactions involve the conversion of matter into energy, but fusion reactions do not. Fusion reactions involve the conversion of matter into energy, but fission reactions do not. Fission reactions are used to generate electricity for consumers, but fusion reactions are not. Fusion reactions are used to generate electricity for consumers, but fission reactions are not.

Answers

How do fission nuclear reactions differ from fusion nuclear reactions?

A. Fission reactions involve the conversion of matter into energy, but fusion reactions do not.

B. Fusion reactions involve the conversion of matter into energy, but fission reactions do not.

C. Fission reactions are used to generate electricity for consumers, but fusion reactions are not.

D. Fusion reactions are used to generate electricity for consumers, but fission reactions are not.

Answer:

Explanation:

Both fission and fusion are nuclear reactions that produce energy, but their applications differs.

Fission is the splitting of a large (heavy, unstable) nucleus into smaller ones, and fusion is the process where nuclei of small atoms are combine together to form the nuclei of larger atoms releasing vast amounts of energy.

The correct answer is c. Fission reactions are used to generate electricity for consumers, but fusion reactions are not.

The physics of fusion is the process that makes the sun shine, and that makes the hydrogen bomb explode.

Answer:

Explanation: