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3 years ago

Can Anyone help me with this?

Physics

2 answers:

zepelin [54]3 years ago

8 0

1. velocity

2. direction

3 idk

4 idk

5 . d

agasfer [191]3 years ago

7 0

1. Velocity

2. Time

3. Idk

4. Idk

5. D. I think it may be A. but I think D.

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Which planet is terrestrial? Jupiter Mars Saturn Uranus

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Answer: The planet Mars is terrestrial.

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3 years ago

A mail carrier parks her postal truck and delivers packages. To do so, she walks east at a speed of 0.80 m/s for 4.0 min, then n

Murljashka [212]

Explanation:

Given that,

She walks in east,

Speed = 0.80 m/s

Time = 4.0 min

In north,

Speed = 0.50 m/s

Time = 5.5 min

In west,

Speed = 1.1 m/s

Time = 2.8 min

(a). We need to calculate the unit-vector velocities for each of the legs of her journey.

The velocity of her in east

$\vec{v_{1}}=0.80\ \hat{x}\ m/s$

$\vec{v_{2}}=0.50\ \hat{y}\ m/s$

$\vec{v_{3}}=1.1\ \hat{-x}\ m/s$

(b). We need to calculate the unit-vector displacements for each of the legs of her journey

Using formula of displacement

$\vec{d_{1}}=v_{1}\times t_{1}$

In east ,

$\vec{d_{1}}=0.80\times4.0\times60$

$\vec{d_{1}}=192\ \hat{x}\ m$

In north,

$\vec{d_{2}}=0.50\times5.5\times60$

$\vec{d_{2}}=165\ \hat{y}\ m$

In west,

$\vec{d_{3}}=1.1\times2.8\times60$

$\vec{d_{3}}=184.8\ \hat{-x}\ m$

(c). We need to calculate the net displacement from the postal truck after her journey is complete

$\vec{d}=\vec{d_{1}}+\vec{d_{2}}+\vec{d_{3}}$

Put the value in the formula

$\vec{d}=192\hat{x}+165\hat{y}+184.8\hat{-x}$

$\vec{d}=7.2\hat{x}+165\hat{y}$

We need to calculate the magnitude of the displacement

$d=\sqrt{(7.2)^2+(165)^2}$

$d=165.16\ m$

The magnitude of the displacement is 165.16 m.

Hence, This is the required solution.

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3 years ago

What is coefficient of thermal conductivity?

Keith_Richards [23]

Answer:

Explanation:

The amount of heat energy of any material to get moved per meter length for per unit change in temperature is called coefficient of thermal conductivity.

The value of coefficient of thermal conductivity is different for different materials.

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3 years ago