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RideAnS [48]
4 years ago
9

If I drop a watermelon from the top of one of the tower dorms at CSU, and it takes 3.34 seconds to hit the ground, calculate how

tall the building is in meters
Physics
1 answer:
WINSTONCH [101]4 years ago
4 0
T= 3.34

Vi= 0

A= 9.81

D= ?

d=Vit+1/2at^2

d= 1/2(9.81)(3.34)2

d= 54.7 or 55 meters tall
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A 3.00 kg object is fastened to a light spring, with the intervening cord passing over a pulley. The pulley is frictionless, and
finlep [7]

Answer:

Part a)

k = 588.6 N/m

Part b)

v = 0.7 m/s

Explanation:

As we know that initially block is at rest

now if block is released from rest then it will go down by 10 cm and again comes to rest

so here we have

Part a)

Work done by gravity + work done by spring force = change in kinetic energy

W_g + W_{spring} = 0 - 0

mg(0.10) + \frac{1}{2}k(0^2 - 0.10^2) = 0

3(9.81)(0.10) - \frac{1}{2}k(0.10)^2 = 0

k = 588.6 N/m

Part b)

Now when spring is stretch by x = 5 cm then the speed of the block is given as

mgx' + \frac{1}{2}k(0^2 - x'^2) = \frac{1}{2}mv^2 - 0

here we have

x' = 0.05 m

3(9.81)(0.05) - \frac{1}{2}(588.6)(0 - 0.05^2) = \frac{1}{2}(3) v^2

1.4715 - 0.736 = 1.5 v^2

v = 0.7 m/s

3 0
3 years ago
sound sensor display reads 40 dB inside and outside it reads 80dB. how many times louder is it outside than inside?
LuckyWell [14K]

The difference is (80 dB - 40 dB) = 40 dB.

The sound is 40 dB louder outside.

Each 10 dB means 10 times more sound power.

40 dB louder means 10x10x10x10 times more sound power.

That's <em>10,000 times</em> more sound power outside than inside.

6 0
2 years ago
The picture shows an aerialist walking on a tightrope and holding a balancing bar.
uysha [10]
A. The aerialist’s feet and the rope
6 0
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Read 2 more answers
Which trends is indirectly proportional to effective nuclear charge
Minchanka [31]

Answer:

Atomic size

Explanation:

In the periodic table , atomic size is indirectly proportional to the effective nuclear charge .the atomic size reduces from left to right across the table. This is because electrons are added to the same shell.

4 0
4 years ago
When electrons are transferred from one atom to another, and the two atoms unite as a result of the opposite charges, a(n) _____
podryga [215]

Answer: ionic compound

Explanation:

An ionic compound is formed when one element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and forms a positively charged ion called as cation. The element which accepts the electrons is known as electronegative element and forms a negatively charged ion called as anion.

For formation of sodium chloride:

Electronic configuration of sodium:

[Na]=1s^22s^22p^63s^1

Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.

[Na^+]=1s^22s^22p^63s^0

Electronic configuration of chlorine:

[Cl]=1s^22s^22p^63s^23p^5

Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.

[Cl^-]=1s^22s^22p^63s^23p^6

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic compound.

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3 years ago
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