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3 years ago

7

Pls, help with this! I'm having trouble. will give points!!

1 answer:

seraphim [82]3 years ago

3 0

Answer:

yes

no

no

no

no

yes

Explanation:

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What is the change in internal energy if a gas loses 80 joules of heat, and then does 60

lana66690 [7]

Answer:

-140

Explanation:

A gas loses 80joules of heat.

The gas also does 60 joules of work

Therefore the change in internal energy can be calculated as follows

= -80 + (-60)

= -80-60

= -140

Hence the change in internal energy is -140

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3 years ago

An object is hanging by a string from the ceiling of an elevator. the elevator is moving upward with a constant speed. what is t

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Since the elevator is moving with a constant speed and not accelerating, the tension in the string is simply the normal, routine, everyday boring weight of the object. Since the elevator is moving with a constant speed and not accelerating, the tension in the string is simply the normal, routine, everyday boring weight of the object.

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4 years ago

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Emotional Intelligence includes:

vazorg [7]

Answer: True

Explanation

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3 years ago

Which is an everyday example of a diffraction grating?

olga_2 [115]

Answer:

A. CD Disk

Explanation:

Pits are placed in rows of the same width and equal distance, which form a diffraction grating on the mirror surface of the CD

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4 years ago

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You are camping with two friends, Joe and Karl. Since all three of you like your privacy, you don't pitch your tents close toget

Lemur [1.5K]

Answer:

Distance between Karl and Joe is 38.467 m

Solution:

Let us assume that you are at origin

Now, as per the question:

Joe's tent is 19 m away from yours in the direction $19.0^{\circ}$ north of east.

Now,

Using vector notation for Joe's location, we get:

$\vec{r_{J}} = 19cos(19.0^{\circ})\hat{i} + 19sin(19.0^{\circ})\hat{j}$

$\vec{r_{J}} = 17.96\hat{i} + 6.185\hat{j} m$

Now,

Karl's tent is 45 m away from yours and is in the direction $39.0^{\circ}$ south of east, i.e., $- 39.0^{\circ}$ from the positive x-axis:

Again, using vector notation for Karl's location, we get:

$\vec{r_{K}} = 45cos(-319.0^{\circ})\hat{i} + 45sin(- 39.0^{\circ})\hat{j}$

$\vec{r_{K}} = 34.97\hat{i} - 28.32\hat{j} m$

Now, obtain the vector difference between $\vec{r_{J}}$ and $\vec{r_{K}}$ :

$\vec{r_{K}} - \vec{r_{J}} = 34.97\hat{i} - 28.32\hat{j} - (17.96\hat{i} + 6.185\hat{j}) m$

$\vec{d} = \vec{r_{K}} - \vec{r_{J}} = 17.01\hat{i} - 34.51\hat{j} m$

Now, the distance between Karl and Joe, d:

|\vec{d}| = |17.01\hat{i} - 34.51\hat{j}|

$d = \sqrt{(17.01)^{2} + (34.51)^{2}} m$

d = 38.469 m

The distance between Karl's and Joe's tent is:

7 0

4 years ago