3 years ago

True Or False for each question

Physics

1 answer:

Nana76 [90]3 years ago

6 0

7 true

8 false

9 false

10 false

11 false

12 true

13 true

hope this helps!

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Austin buys a new moped he travel 3 km south and then 4 km east and then 3km north how far does he need to go to get back to whe

Ira Lisetskai [31]

The first thing to do is to define the origin of the coordinate system as the point at which the moped journey begins.
Then, you must write the position vector:
r = -3j + 4i + 3j
Rewriting
r = 4i
To go back to where you started, you must go
d = -4i
That is to say, must travel a distance of 4Km to the west.
Answer
West, 4km.

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3 years ago

Consider steady heat transfer between two large parallel plates at constant temperatures of T1 = 210 K and T2 = 150 K that are L

snow_lady [41]

Answer:

$Q=81.56\ W/m^2$

Explanation:

Given that

$T_1= 210 K$

$T_2= 150 K$

Emissivity of surfaces(∈) = 1

We know that heat transfer between two surfaces due to radiation ,when both surfaces are black bodies

$Q=\sigma (T_1^4-T_2^4)\ W/m^2$

So now by putting the values

$Q=\sigma (T_1^4-T_2^4)\ W/m^2$

$Q=5.67\times 10^{-8}(210^4-150^4)\ W/m^2$

$Q=81.56\ W/m^2$

So rate of heat transfer per unit area

$Q=81.56\ W/m^2$

8 0

3 years ago

Explorers on a small airless planet used a spring gun to launch a ball bearing vertically upward from the surface at a launch ve

Oksana_A [137]

Answer:

gs = 0.6 m/s^2

Explanation:

Given data:

velocity = 12 m/s

height s = 12t -(1/2) g_s t^2

Given velocity is the derivatives of height

$v(t) = \frac{d}{dt} s(t)$

$= \frac{d}{dt}(12t -\frac{1}{2} g_s t^2)$

$= 12 - g_s t$

when velocity tend to 0 , maximum height is reached

$v(t) = 12 - g_s t$

$0 = 12 - g_s t$

$g_s = \frac{12}{t}$

at t = 20 sec ball reached the max height, so

$g_s = \frac{12}{20} = 0.6 m/s^2$

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3 years ago

What happens to the motion of an object when the forces acting on it are balanced? A. The motion changes. B. The motion does not

AlexFokin [52]

The answer is B the mation does not change..?? did i get ir right.

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3 years ago

What variables affect gravity

vlabodo [156]

Gravity is affected by the size of an object and the distance between the objects. When the mass of an object increases the force of gravity increases as well.

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