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3 years ago

Which of the following statements are true about gravity? Check all that

Physics

1 answer:

mamaluj [8]3 years ago

4 0

Answer:

c d and e

Explanation:

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Using component notation, enter the vector B⃗ B→B_vec in the answer box. Enter your answer as a pair of vector components, separ

Tomtit [17]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The value is $\vec B = 2, -3$

Explanation:

Looking at the graph in the diagram we see each unit is equal to 1 both in the x axis and in the y- axis

Now the value of B along the x axis is

$B_x = 2$

and along the y axis the value is

$B_y = -3$

Hence the vector B is

$\vec B =(B_x , B_y)= ( 2, -3)$

8 0

3 years ago

A certain wire, 3 m long, stretches by 1.2 mm when under tension of 200 N. By how much does an equally thick wire 6 m long, made

shusha [124]

Answer:

2.4 mm

Explanation:

Given that:

Initial Original length of the wire L = 3 mm

The stretch of the first wire ΔL= 1. 2 mm

The length of the second wire L'' = 6 mm

The stretch of the second wire ΔL'' = ???

Considering the Tension of the system; the Young modulus and the cross sectional remains constant ; as such:

$\frac{Y}{Y''} = \frac{FL}{A \Delta L} *\frac{A \Delta L''}{FL''}$

$1= \frac{L \Delta L''}{L'' \Delta L}$

$\Delta L''= \frac{L'' \Delta L }{L}$

$\Delta L''= \frac{6 \ m * 1.2 \ mm }{3 \ m}$

$\Delta L''=2.4 \ mm$

Thus, the same material under the same tension stretches 2.4 mm

8 0

3 years ago

Read 2 more answers

A 1 kg particle moves upward from the origin to (23) m. Wit is work done by the force of gravity which is in - y direction s B.

sveta [45]

Answer:

Explanation:

mass, m = 1 kg

Position (2, 3 ) m

height, h = 2 m

acceleration due to gravity, g = 9.8 m/s^2

Here, no force is acting in horizontal direction, the force of gravity is acting in vertical direction, so the work done by the gravitational force is to be calculated.

Force mass x acceleration due to gravity

F = 1 x 9.8 = 9.8 N

Work = force x displacement x CosФ

Where, Ф be the angle between force vector and the displacement vector.

Here the value of Ф is 180° as the force acting vertically downward and the displacement is upward

So, W = 9.8 x 2 x Cos 180°

W = - 19.6 J

Thus, option (A) is correct.

4 0

3 years ago

After a displacement of 17 m, a train on a straight track is at the position xf = –2.5 m

EastWind [94]

-19.5m

-19.5+17=-2.5m

5 0

3 years ago

Read 2 more answers

How much positive electric charge is in 10 moles of carbon? NA=6.022×1023mol−1, e=1.60×10−19C.

levacccp [35]

Answer:

4.75 x 10^-25 kg

Explanation:

5 0

3 years ago