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dimulka [17.4K]
3 years ago
14

If you press as hard as you can against a brick wall until you begin to sweating and breathing hard did you do any work on the w

all? Explain.
Physics
1 answer:
Reika [66]3 years ago
4 0
No, as long as nothing moves you aren't doing work, since W=F.s. You have no s, so no W
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A 3 N force pushing to the right on a box causes it to accelerate 6 m/s² to the right. What is the mass of the box?
Aloiza [94]

18 kg would be the answer to that


8 0
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Does the sign of the charge (positive or negative) affect how that charge is dissipated? Explain.
labwork [276]
This is an add proceeded by
5 0
3 years ago
A pencil is rolled off a table of height 0.92 m. If it has horizontal speed pf 1.4 m/s, how long does it take the pencil to reac
Alenkasestr [34]

The distance an object falls, from rest, in gravity is

                         D  =  (1/2) (G) (T²)

                        'T' is the number seconds it falls.

In this problem,

                         0.92 meter = (1/2) (9.8) (T²)

Divide each side by  4.9 :   0.92 / 4.9 = T²

Take the square root
of each side:                          √(0.92/4.9) = T

                                                  0.433 sec = T    

The horizontal speed doesn't make a bit of difference in
how long it takes to reach the floor.  BUT ... if you want to
know how far from the table the pencil lands, you can find
that with the horizontal speed.

The pencil is in the air for  0.433 second.
In that time, it travels
                                   (0.433s) x (1.4 m/s) = 0.606 meter

from the edge of the table.
 
3 0
3 years ago
4.6 billion years ago the earth is created from what
Lina20 [59]

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6 0
3 years ago
The ball of a ballpoint pen is 0.5 mm in diameter and has an ASTM grain size of 12. How many grainsare there in the ball
Alina [70]

Answer:

the number of grains in the ball is 274,848

Explanation:

Given that;

diameter = 0.5 mm

so radius r = 0.25 mm

first we determine the volume of the ball using the following equation;

V = 4/3×πr³

we substitute

V = 4/3×π(0.25)³

V =  0.06544 mm³

Now form table 1.1 "Grain sizes" a metal with grain size number of 12 has about 4,200,000 grains/mm³

so;

Number of grains N = 0.06544 × 4,200,000

N = 274,848 grains

Therefore, the number of grains in the ball is 274,848

5 0
3 years ago
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