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3 years ago

Jay kicks a soccer ball Upward at an angle of 45 with a velocity of 20 m/s landing 2.8 seconds later

Physics

1 answer:

Lisa [10]3 years ago

5 0

Answer:hello what are we to do

Explanation:

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Question 8 (1 point)

sineoko [7]

Answer:

Explanation:

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2 years ago

What is a GOOD AND DETAILED introduction on a thermos. will be awarded 25 points im desperate

ANEK [815]

A thermos as another name - it's called the vacuum flask. It's used for<span> storing cryogens when it has certain boiling points that are much lower than the actual room temperature. Many people use thermoses as a cup for drinking, specifically coffee, teas, and other hot drinks.

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3 years ago

4. What are three tips parents can use to improve communication with their children? Discuss one that you think is most importan

Mumz [18]

Have them give up there phone for 15 minutes
talk to them when there in a good mood
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3 years ago

The mass of a hot-air balloon and its cargo (not including the air inside) is 170 kg. The air outside is at 10.0°C and 101 kPa.

scoundrel [369]

Answer:

108.37°C

Explanation:

P₁ = Initial pressure = 101 kPa

V₁ = Initial volume = 530 m³

T₁ = Initial temperature = 10°C = 10+273.15 =283.15 K

P₂ = Final pressure = 101 kPa (because it is open to atmosphere)

V₂ = Final volume = 530 m³

P₁V₁ = n₁RT₁

⇒101×530 = n₁RT₁

⇒53530 J = n₁RT₁

P₂V₂ = n₂RT₂

⇒53530 J = n₂RT₂

$\frac{m_1}{m_2}=\frac{\rho V_1}{\rho V_1-170}\\\Rightarrow \frac{m_1}{m_2}=\frac{1.244\times 530}{1.244\times 530-170}=1.347\\\Rightarrow \frac{m_1}{m_2}=1.347\\\Rightarrow \frac{n_1}{n_2}=1.347$

Dividing the first two equations we get

$1=\frac{n_1}{n_2}\frac{T_1}{T_2}\\\Rightarrow 1=1.347\frac{283.15}{T_2}\\\Rightarrow T_2=1.347\times 283.15= 381.52\ K$

∴Temperature must the air in the balloon be warmed before the balloon will lift off is 381.25-273.15 = 108.37°C

8 0

3 years ago

Bullets spin when shot from a rifle or handgun. What causes this spinning?

tamaranim1 [39]

Answer:

The spark from the primer ignites the gunpowder. Gas converted from the burning powder rapidly expands in the cartridge. The expanding gas forces the bullet out of the cartridge and down the barrel with great speed. The rifling in the barrel causes the bullet to spin as it travels out of the barrel.

Explanation:

7 0

2 years ago

Jay kicks a soccer ball Upward at an angle of 45 with a velocity of 20 m/s landing 2.8 seconds later​

Jay kicks a soccer ball Upward at an angle of 45 with a velocity of 20 m/s landing 2.8 seconds later