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3 years ago

Molecules cool a cloud and are usually located on the edges of the cloud. T/F

Physics

1 answer:

allochka39001 [22]3 years ago

4 0

I think true but not sure about it

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Which of the following astronomers was the first to propose elliptical orbits for the planets in our solar system?A.Brahe.Kepler

Anastasy [175]

B. Kepler, he made the laws for planetary motion

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4 years ago

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Anger is to angry as fire is to what

finlep [7]

<span>Anger is to angry as fire is to blazing. </span>

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3 years ago

Math Practice: Cart A loaded with blocks (600g) moving left at 0.7m/s hits stationary cart B (200g).

Vika [28.1K]

Answer:

The velocity of cart B after the collision is 1.29 m/s.

Explanation:

We can find the velocity of cart B by conservation of linear momentum:

$p_{i} = p_{f}$

$m_{A}v_{A_{i}} + m_{B}v_{B_{i}} = m_{A}v_{A_{f}} + m_{B}v_{B_{f}}$

Where:

$m_{A}$ is the mass of cart A = 600 g = 0.6 kg

$m_{B}$ is the mass of cart B = 200 g = 0.2 kg

$v_{A_{i}}$ is the inital velocity of cart A = 0.7 m/s

$v_{A_{f}}$ is the final velocity of cart A = 0.27 m/s

$v_{B_{i}}$ is the initial velocity of cart B = 0

$v_{B_{f}}$ is the final velocity of cart B =?

Taking the left direction as the positive horizontal direction:

$0.6 kg*0.7 m/s + 0 = 0.6 kg*0.27 m/s + 0.2 kg*v_{B_{f}}$

$v_{B_{f}} = 1.29 m/s$

Therefore, the velocity of cart B after the collision is 1.29 m/s.

I hope it helps you!

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3 years ago

An old streetcar rounds a flat corner of radius 6.80 m, at 18.0 km/h. What angle with the vertical will be made by the loosely h

natka813 [3]

Answer:

$\alpha =20.564^{o}$

Explanation:

Given data

Radius R=6.80 m

Velocity v=18 km/h =5 m/s

First we need to set up for Force in vertical (y) and horizontal (x)

∑Fy=0=TCosα-W

∑Fx=ma=Fc=TSinα

Solve Vertical force equation for T,substituting mg for W

$TCos\alpha -W=0\\TCos\alpha=W\\TCos\alpha=mg\\T=(mg/Cos\alpha)$

Substitute expression for Fc and T into horizontal force and simplify it we get

$Fc=TSin\alpha\\ where\\Fc=(mv^{2}/R )\\So\\(mv^{2}/R )=(mg/Cos\alpha )Sin\alpha\\(mv^{2}/R )=mg*tan\alpha\\ tan\alpha =\frac{v^{2} }{Rg}\\ \alpha =tan^{-1}(\frac{(5m/s)^{2} }{(6.80m)(9,8m/s^{2} )} )\\ \alpha =20.564^{o}$

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3 years ago

A car travels at a constant speed of 30km/h for .80h what is the total distance

Simora [160]

Answer:

2400 km

Explanation:

30km for 1hr

Need up to 80 hrs , multiply both 80 and 30

So its 2400km

4 0

3 years ago