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3 years ago

Which of the following are not vector directions?

Physics

2 answers:

Svetradugi [14.3K]3 years ago

6 0

Answer:

here north are not vector option b hope ur help

Verizon [17]3 years ago

4 0

Answer:

Hello! Your answer is BELOW.

Explanation:

Outside 45 degrees

35 degrees inside

Hope I helped Hope you make an 100%

-Amelia♥

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A car movingin a straight line starts at x = 0 at t = 0. It passes the point x = 25.0 m with a speed of 11.0 m????s at t = 3.00s

makvit [3.9K]

Answer:

Part a)

at t = 3.00 s

$v = 8.33 m/s$

at t = 20.0 s

$v = 19.25 m/s$

Part b)

at t = 3.00 s

$a = 3.67 m/s^2$

at t = 20.0 s

$a = 2.25 m/s^2$

Explanation:

The car starts at x = 0

Part a)

Now at t = 3.00 s

the position of the car is given as x = 25 m and its speed is given as v = 11 m/s

Now for average velocity we have

$v = \frac{displacement}{time}$

$v = \frac{25 - 0}{3}$

$v = 8.33 m/s$

Now for average acceleration we have

$a = \frac{v - 0}{t}$

$a = \frac{11 - 0}{3}$

$a = 3.67 m/s^2$

Part b)

Now at t = 20.0 s

the position of the car is given as x = 385 m and its speed is given as v = 45 m/s

Now for average velocity we have

$v = \frac{displacement}{time}$

$v = \frac{385 - 0}{20}$

$v = 19.25 m/s$

Now for average acceleration we have

$a = \frac{v - 0}{t}$

$a = \frac{45 - 0}{20}$

$a = 2.25 m/s^2$

4 0

3 years ago

Please explain why the numbers in front of chemical formulas, not the subscripts, must be changed to balance an equation.

Vlad1618 [11]

<span>The numbers in front of the chemical formulas change so that the equation will be balanced</span>

5 0

3 years ago

An object is placed at a distance of 60 cm from a concave lens of focal length 30cm.find the position and nature of the image?

ladessa [460]

Answer:

using the lens formula: 1/f = 1/u + 1/v

focal length f = -30 (negative because it is concave lens)

object distance u = 60

image distance v= unknown

1/-30 = 1/60 + 1/v

v = -20

So, the image is 20cm from lens (on the same side along with the object), and it is virtual (because of negative sign) and erect (concave lens must produce erect images).

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3 years ago

Harold is using what he knows about cause-and-effect relationships to write a paper explaining cloud shape. How could he describ

Gre4nikov [31]

Answer:c

Explanation:

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3 years ago

[URGENT] A swimmer wants to end up at a dock due north of her starting position on the south shore of a river. In still water he

Stells [14]

Explanation:

As you can see in the picture, we want the swimmer to go on a straight line, so the speed of the water must be equal to the speed of the swimmer along the x-axis. We also know the value of v, so we can calculate the of the cosine of the angle (alpha) between Vx and V. Thanks to the fundamental relation of gioniometry (cos^2(x) + sin^2(x) = 1) we can find the sine of alpha and calculate Vy. With Vy we can calculate the time that the swimmer will use for reaching the dock: s = Vy * t => t = s/(Vy).

I'll let you do all the calculations, you just have to plug in values.

6 0

3 years ago