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atroni [7]
3 years ago
13

Why do people cover their flowers on a cool night. Think about radiation absorption conduction and temperature

Physics
1 answer:
Blababa [14]3 years ago
3 0
When the temperature lowers the plants can freeze and die. One way to prevent that is to cover the plants so they dont freeze 

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A box sliding on a horizontal frictionless surface encounters a spring attached to a rigid wall and compresses the spring by a c
GaryK [48]

Answer:

a) K = 49.5 J  b) k = 1378 N / m c) ΔE = 34 J  d)  μ = 0.399

Explanation:

For this exercise we will use the concepts of energy

a) The initial kinetic energy is

    K = ½ m v²

    K = ½ 3.96 5²

    K = 49.5 J

b) let's use energy conservation

    Em₀ = K = ½ m v²

    Em_{f} = Ke = ½ k x²

    Em₀ =  Em_{f}

    ½ m v² = ½ k x²

    k = m v² / x²

    k = 3.96 5² / 0.268²

    k = 1378 N / m

c) Let's calculate the final energy of the spring

     Em_{f} = Ke = ½ k x²

    Em_{f} = ½ 1378 0.15²

     Em_{f} = 15.5 J

The initial energy is the kinetics of the block

    Em₀ = 49.5 J

The lost energy is the difference with the initial

    ΔE =  Em_{f} - Em₀

    ΔE = 15.5 - 49.5

    ΔE = - 34 J

the negative sign means that the energy dissipates

d) For this part we use the concept of work

   W = F d cos θ = ΔK

In this case the force is the friction force that always opposes displacement, so the angle 180 ° and cos 180 = -1

    W = -fr d = ΔK

The force of friction is

   fr = μ N

With Newton's second law

    N-w = 0

    N = W = mg

Let's calculate

   -μ mg d = Kf -K₀o

    μ = K₀ / mgd

    μ = 49.5 / (3.96  9.8  3.20)

    μ = 0.399

8 0
3 years ago
What is the maximum and minimum wavelength of echolocation?
nadezda [96]
I believe the answer is 40,000 Hz to 100,000 Hz
7 0
3 years ago
Read 2 more answers
What is centripetal force<br>hello​
Gwar [14]

Answer:

A centripetal force is a net force that acts on an object to keep it moving along a circular path

8 0
2 years ago
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Your ear is capable of differentiating sounds that arrive at each ear just 0.34 ms apart, which is useful in determining where l
goblinko [34]

Answer:

Δt = 5.29 x 10⁻⁴ s = 0.529 ms

Explanation:

The simple formula of the distance covered in uniform motion can be used to find the interval between when the sound arrives at the right ear and the sound arrives at the left ear.

\Delta s = v\Delta t\\\\\Delta t = \frac{\Delta s}{v}

where,

Δt = required time interval = ?

Δs = distance between ears = 18 cm = 0.18 m

v = speed of sound = 340 m/s

Therefore,

\Delta t = \frac{0.18\ m}{340\ m/s}

<u>Δt = 5.29 x 10⁻⁴ s = 0.529 ms</u>

4 0
3 years ago
What never change despite what planet you go to
laiz [17]
Your mass will never change despite if you go to Jupiter, Uranus, Mars, Earth, or any planet.
7 0
3 years ago
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