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3 years ago

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A wrecking ball is suspended by two cables as shown below. If the tension in cable 2 is 12 000 N, what is the weight of the wrec

king ball?

1 answer:

Paul [167]3 years ago

5 0

Wrecking ball wow get Miley Cyrus also I’m sorry I’m joking bout it and you should report the person who be putting “links”

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The return-air ventilation duct in a home has a cross-sectional area of 900 cm^2. The air in a room that has dimensions 7.0 m ××

koban [17]

Answer:

0.86 m/s

Explanation:

A = cross-sectional area of the duct = 900 cm² = 900 x 10⁻⁴ m²

v = speed of air in the duct

t = time period of circulation = 40 min = 40 x 60 sec = 2400 sec

V = Volume of the air in the room = volume of room = 7 x 11 x 2.4 = 184.8 m³

Volume of air in the room is given as

V = A v t

inserting the values

184.8 = (900 x 10⁻⁴) (2400) v

v = 0.86 m/s

6 0

3 years ago

A partially filled bag of cement with mass of 16 kg falls 40 m into a river from a bridge. What is its speed just before it hits

Verizon [17]

Answer:

28 metres

Explanation:

when the bag is about to hit the ground

potential energy = kinetic energy

$mgh = \frac{1}{2}mv^{2}$

where m = mass

g = acceleration due to gravity

v = speed

when you simplify the above equation and make v subject of the formular we have

$v=\sqrt{2gh}$

where g = 9.8m/s

h = 40

$v=\sqrt{2\times 9.8\times 40}=28m$

5 0

3 years ago

Why concave lens is called diverging lens

dangina [55]

When a parallel beam of light passes through a convex lens, the rays become farther from one another when the come out. This process of rays is called ''to diverge''. The concave lens makes rays of light diverge, so it is called diverging lens.

6 0

3 years ago

A uniform electric field exists everywhere in the x, y plane. This electric field has a magnitude of 4700 N/C and is directed in

denis23 [38]

Answer:

a) 7300 N/C

b) 2100 N/C

c) 5371.2 N/C

Explanation:

The uniform electric field = (4700î) N/C

The electric field due to a point charge is given as

E = kq/r²

k = Coulomb's constant = (9.0 × 10⁹) Nm²/C²

|q| = the charge = (8.35 × 10⁻⁹) C

Note that for a negative charge, the electric field is directed from the point towards the charge.

a) x = -0.17 m.

r = (-0.17î) m

magnitude of r = 0.17 m

E = (9.0 × 10⁹ × 8.35 × 10⁻⁹)/0.17²

E = 2600 N/C

In vector form

E = (2600î) N/C (it is positive, since the field is directed from x = -0.17 m to the origin)

E(total) = 4700î + 2600î = (7300î) N/C

Magnitude = 7300 N/C

b) At x = 0.17 m

E = kq/r² gives us the same magnitude

E = 2600 N/C

But in vector form

E = (-2600î) N/C (this is because the field due to the charge is directed from x = 0.17 m to the origin, in the negative x-direction)

E(total) = 4700î - 2600î = (2100î) N/C

Magnitude = 2100 N/C

c) At y = 0.17 m

E = kq/r² is still equal in magnitude to 2600 N/C

But in vector form

E = (-2600j) N/C (directed from y = 0.17 m to the origin along the negative y-direction)

E(total) = (4700î - 2600j) N/C

Magnitude = √[4700² + (-2600)²]

Magnitude = 5371.2 N/C

Hope this Helps!!!

3 0

3 years ago

Read 2 more answers

This question is about magnets and net force (I think.) Please no absurd answers!

kobusy [5.1K]

Answer:

D

Explanation:

Ok this is what I think I think it's D because when two mangnets have a force upon one thing at the same time I don't think it would move

5 0

3 years ago

Read 2 more answers