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xxTIMURxx [149]
3 years ago
5

Please answer these!

Physics
1 answer:
malfutka [58]3 years ago
3 0

10, 11 and 14:

speed = (frequency)x(wavelength)

12: wavelength=(speed)/(frequency)

13 and 15:

frequency = (speed) / (wavelength)

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How are the raincoats waterproof? explain​
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Answer:

Rain jackets are coated in durable water-repellant (DWR) finish, a hydrophobic glaze that allows the coats to be breathable, yet waterproof. It lets water vapor—like sweat—out, but keeps rain from getting in. ... Without a DWR, the raincoat is just a coat. So, you'll need to recoat it.

Explanation:

This is according to the web

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If cats always land on their feet, how do they get hurt when they fall?
Ulleksa [173]
The impact front the fall, depending on the distance, has an effect on the impact of their bones crushing with the pressure from the fall.
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You are driving to the grocery store at 20 m/s. You are 110 m from an intersection when the light turns red. You have a reaction
Lynna [10]

Answer:

a)

reaction time = 0.70 s

distance travelled in reaction time = v*t

= 20 m/s * 0.70 s

= 14 m

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Answer: 96 m

b)

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d = 96 m

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vf^2 = vi^2 + 2*a*d

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Answer: -2.08 m/s^2

c)

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vf = vi + a*t

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8 0
2 years ago
Part A:
kobusy [5.1K]
In a perfectly ELASTIC collision between two perfectly rigid objects <span>both the momentum and the kinetic energy of the system are conserved.hope it helps</span>
7 0
3 years ago
Read 2 more answers
A pirate ship shoots a cannon towards an oncoming ship. The cannon ball has a mass of 25 kg and the ship has a mass of 2500 kg.
mars1129 [50]

Answer:

25 m/s in the opposite direction with the ship recoil velocity.

Explanation:

Assume the ship recoil velocity and velocity of the cannon ball aligns. By the law of momentum conservation, the momentum is conserved before and after the shooting. Before the shooting, the total momentum is 0 due to system is at rest. Therefore, the total momentum after the shooting must also be 0:

m_sv_s + m_bv_b = 0

where m_s = 2500 kg, m_b = 25 kg are masses of the ship and ball respectively. v_s = 0.25 m/s, v_b are the velocities of the ship and ball respectively, after the shooting.

2500*0.25 + 25*v_b = 0

25v_b = -2500*0.25

v_b = -2500*0.25/25 = -25 m/s

So the cannon ball has a velocity of 25 m/s in the opposite direction with the ship recoil velocity.

3 0
3 years ago
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