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Anit [1.1K]
3 years ago
8

Plane 1 leaves city A at 7 am and flies at a speed of 250 mph in a straight line towards city B, located 1000 miles North of cit

y A. Plane 2 leaves city C located 300 miles East and 400 miles North of city A at 7:30 am and flies West at a speed v mph. The planes fly at the same altitude. For which value of v do they collide ?
Physics
1 answer:
Reika [66]3 years ago
8 0

Answer:v=142.85 mph

Explanation:

Given

Distance between two cities is 1000 miles

Speed of plane 1 id 250 mph

Plane 1 leaves at 7 am and Plane 2 leaves at 7:30 am

They will collide if plane 2 travels 300 miles and Plane  1 travels 400 miles in t and t+0.5 hr  respectively

Time taken by plane 2

t=\frac{300}{v}----1

time taken by plane  1 to travel 400 miles

t+0.5=\frac{400}{250}-----2

substitute value of t in 2

\frac{300}{v}+0.5=\frac{400}{250}

\frac{300}{v}=2.1

v=\frac{300}{2.1}=142.85 mph

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Art [367]

Answer:

The false statement is in option 'd': The center of mass of an object must lie within the object.

Explanation:

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As we can see for homogenous symmetrical objects such as a sphere,cube,disc the center of mass is located at the centroid of the shapes itself but in many shapes it is located outside the body also.

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6 0
3 years ago
What velocity does a 2kg mass have when its kinetic energy is 16 J
alexandr402 [8]
We can use the equation for kinetic energy, K=1/2mv².
Your given variables are already in the correct units, so we can just plug in the variables and solve for v. 

K = 1/2mv²
16 = 1/2(2)v²
16 = (1)v²
√16 = v
v = 4 m/s

Therefore, the velocity of a 2 kg mass with 16 J of kinetic energy is 4 m/s.
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7 0
3 years ago
Imagine that you are going to visit your friend. Before you get there, you decide to stop at the variety store. If you walk 200
SashulF [63]

Answer:

400m

Explanation:

Brainliest? :))

Let your initial displacement from your home to the store be

Dd

>

1 and your displacement from the store to your friend’s house

be Dd

>

2.

Given: Dd

>

1 = 200 m [N]; Dd

>

2 = 600 m [S]

Required: Dd

>

T

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>

T 5 Dd

>

1 1 Dd

>

2

Solution: Figure 6 shows the given vectors, with the tip of Dd

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1

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2. The resultant vector Dd

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T is drawn in red,

from the tail of Dd

>

1 to the tip of Dd

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2. The direction of Dd

>

T is [S].

Dd

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T measures 4 cm in length in Figure 6, so using the scale of

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6 0
2 years ago
When reaching a boundary between two media (1 and 2), an incident ray is partially reflected and partially refracted. The ray is
lukranit [14]

Answer:

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Explanation:

According to Snell's Law,

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θ₁ = arctan 1 = 45°

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3 years ago
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