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2 years ago

Which is measured by the power of a machine?

Physics

1 answer:

Alina [70]2 years ago

7 0

the rate of work done or doing work is usually measured by the power of a machine .

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A large sphere has a mass of 175 kg and is suspended by a chain from the ceiling. The mass of the chain is 12.0 kg. What is the

Elina [12.6K]

Each point in the chain supports the weight of all the mass below it.

At the bottom end of the chain, the weight is (175 x 9.8) = 1,715 N .
At the top of the chain, the weight is (175 + 12) x (9.8) = 1,833 N .

The tension in the chain varies linearly from 1,715N at the bottom
to 1,833N at the top.

5 0

2 years ago

A boy whirls a stone in a horizontal circle of radius 1.50m and at height 2.00m above level ground. The string breaks, and the s

Eddi Din [679]

Answer:

$a_{cp}=162.2m/s^2$

Explanation:

The time the stone takes to fall can be calculated considering only the vertical component with the formula:

$y=y_0+v_{0y}t+\frac{a_yt^2}{2}$

Taking the inital height as 0m and downward direction positive, since it departs from (vertical) rest we have:

$y=\frac{gt^2}{2}$

Which gives us a time:

$t=\sqrt{\frac{2y}{g}}=\sqrt{\frac{2(2m)}{(9.8m/s^2)}}=0.64s$

Horizontally, on that time the stone travelled a distance x=10m, which means its horizontal speed was:

$v_x=\frac{x}{t}=\frac{10m}{0.64s}=15.6m/s$

Since <u>this speed is the tangential velocity</u> while whirling, the centripetal acceleration of the stone was:

$a_{cp}=\frac{v_x^2}{r}=\frac{(15.6m/s)^2}{(1.5m)}=162.2m/s^2$

7 0

3 years ago

If a diffuse gas of atoms is trapped, cooled, and compressed, the de Broglie wavelengths of some atoms can become larger than th

skelet666 [1.2K]

Answer:

a) λ = 0.5346 10⁻⁹ m, b) 1.13

Explanation:

a) The wave-particle duality is

λ = $\frac{\hbar }{p}$

the expression for energy kinetic is

E = p² / 2m

energy is also related to temperature

E = $\frac{3}{2} \ kT$

we substitute

p =

λ =

Rubidium's mass is m = 85 uma

we calculate

λ =

λ=

λ = 0.5346 10⁻⁹ m

b) the relationship of the two lengths is

λ /0.47 nm = 0.53 / 0.47 = 1.13

7 0

3 years ago

Which items did Mendeleev write down on note cards while he was observing

Alinara [238K]

Mendeleev wrote down atomic mass

7 0

2 years ago

Read 2 more answers

The current in a wire is 0.72 A, calculate the charge that passes through the wire in 7 mins

yKpoI14uk [10]

We know, I = Q / t
Here, I = 0.72 A
t = 7 min = 7*60 = 420 s

Substitute their values,
0.72 = Q / 420
Q = 420 * 0.72
Q = 302.4 C

In short, Your Answer would be 302.4 Coulombs

Hope this helps!

4 0

3 years ago