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3 years ago

3 Below, someone is trying to balance a plank with

Physics

1 answer:

belka [17]3 years ago

8 0

Answer:

a. The moment of the 4 N force is 16 N·m clockwise

b. The moment of the 6 N force is 12 N·m anticlockwise

Explanation:

In the figure, we have;

The distance from the point 'O', to the 6 N force = 2 m

The position of the 6 N force relative to the point 'O' = To the left of 'O'

The distance from the point 'O', to the 4 N force = 4 m

The position of the 4 N force relative to the point 'O' = To the right of 'O'

a. The moment of a force about a point, M = The force, F × The perpendicular distance of the force from the point

a. The moment of the 4 N force = 4 N × 4 m = 16 N·m clockwise

b. The moment of the 6 N force = 6 N × 2 m = 12 N·m anticlockwise.

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A uniform disk with radius 0.650 m

VashaNatasha [74]

Answer:

$a = 13.758\,\frac{m}{s^{2}}$

Explanation:

First, the instant associated to the angular displacement is:

$(1.10\,\frac{rad}{s} )\cdot t + (6.30\,\frac{rad}{s^{3}} )\cdot t^{2} - 0.628\,rad = 0$

Roots of the second-order polynomial are:

$t_{1} \approx 0.240\,s, t_{2} \approx -0.415\,s$

Only the first root is physically reasonable.

The angular velocity is obtained by deriving the angular displacement function:

$\omega (0.240\,s) = 1.10\,\frac{rad}{s}+ (12.6\,\frac{rad}{s^{2}})\cdot (0.240\,s)$

$\omega (0.240\,s) = 4.124\,\frac{rad}{s}$

The angular acceleration is obtained by deriving the previous function:

$\alpha (0.240\,s) = 12.6\,\frac{rad}{s^{2}}$

The resultant linear acceleration on the rim of the disk is:

$a_{t} = (0.650\,m)\cdot (12.6\,\frac{rad}{s^{2}} )$

$a_{t} = 8.190\,\frac{m}{s^{2}}$

$a_{n} = (0.650\,m)\cdot (4.124\,\frac{rad}{s} )^{2}$

$a_{n} = 11.055\,\frac{m}{s^{2}}$

$a = \sqrt{a_{t}^{2}+a_{n}^{2}}$

$a = 13.758\,\frac{m}{s^{2}}$

3 0

3 years ago

Does time machine really exist?

Genrish500 [490]

No...and even if it did the present that you are in would not be the same...theres no need for time machine because whatever happens , happens for good because its from GOD.

7 0

4 years ago

Read 2 more answers

Heather and Jerry are standing on a bridge 60 m above a river Heather throws a rock straight down with a speed of 14 m/s. Jerry,

melisa1 [442]

Answer:

Time elapsed = 2.856

SECOND ROCK HAS FASTER SPEED

Explanation:

This can be achieved in 2 ways, and it is clear from the careful study that the travel time is attributed to the time required to cross the path above the bridge by the 2nd stone i.e.

14 = 9.8 * t

t = 1.428 sec and

time between 2 splash = 2 * 1.428 = 2. 857 sec

2nd way

let time for 1st spalsh be t and

second splash be t1.

from equation of motion

so 60 = 14t + 0.5 * 9.8 * t * t

4.9 t^2 + 14t -60 = 0

On solving, we get t = 2.351 sec

for t_1, we have some extra time, which can be divided into t2 and t3.

14 = 9.8 * t2

t2 = 1.428 sec

total time taken by 2 is

T = 1.428 + 1.428 + 2.351

so we get t_1 = 5.207 sec

time elapsed is = T - t

= 5.207 - 2.351

Time elapsed = 2.856

SECOND ROCK HAS FASTER SPEED

4 0

3 years ago

Hurricane or typhoons occur when large areas of the open ocean soak up heat from the sun t or f

11Alexandr11 [23.1K]

Answer: true

Explanation:

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3 years ago

At what speed, in m/s, would a moving clock lose 1.3ns in 1.0 day according to experimenters on the ground?

OleMash [197]

Answer:

v=0.14c

Explanation:

5 0

3 years ago