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dexar [7]
3 years ago
14

A construction worker uses 1,000 J of work to screw two boards together. The screw does 855 J of work. Calculate the efficiency

of the screw.
PLZ HELP!!!


​
Physics
1 answer:
Dovator [93]3 years ago
7 0

Answer:

The efficiency of the screw is 85.5%

Explanation:

to calculate efficiency you have to do

efficiency=energy output/ energy input × 100%

so e=855/1000 × 100%=85.5%

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Describe the shape of the earth besides round and tell me how it rotates​
NNADVOKAT [17]

Answer:

The Earth is in hydrostatic equilibrium pretty much. Which is to say that if it were entirely liquid it would still be the same shape ignoring minor differences like mountain ranges that are in any case indistinguishable on the large scale.

A spinning liquid sphere will flatten out somewhat at the axis poles and expand somewhat in its equatorial region and that’s the way the Earth is.

Hope it wirks

8 0
2 years ago
A stone is dropped from a cliff at time t = 0 and strikes the ground below.
Dafna1 [17]

Answer:

S=

2

1

gt

2

........(1)

And that of the other stone is

S=u(t−n)+

2

1

[g(t−n)

2

]........(2)

Since both the stones meet at the distance so equation (1)and equation(2) will be equal

2

1

gt

2

=u(t−n)+

2

1

[g(t−n)

2

]

gt

2

=2ut−2un+gt

2

+gn

2

−2gnt

t(2gn−2u)=gn

2

−2un

t=

(gn−u)

n(

2

gn

−u)

now putting value of t in equation(1)

s=

2

g

⎣

⎢

⎡

gn−u

2

[n(

2

gn

−u)]

⎦

⎥

⎤

2

S=

2

g

⎣

⎢

⎡

(gn−u)

2

n(

2

gn

−u)

⎦

⎥

⎤

Explanation:

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5 0
3 years ago
Which of the following is not a major component of soil?
Studentka2010 [4]

<span>Hello! The pointed component, which is not found in such a large amount is the earthworm. Others, such as air, for example, are permeating all soils. Hugs!</span>
7 0
3 years ago
An instrument that can detect the presence of an electric charge is a
vodka [1.7K]
Electroscope is the instrument that has the ability to detect the presence of an electric charge. Although electroscope has the power to measure the amount of charge, but for a perfect measurement the electrometer is used. Around the year 1600, electroscope was discovered by William Gilbert he British physician. This is a pretty primitive but highly effective instrument in regards to detecting the presence of electric charges. Two basic but effective electroscopes are the gold-leaf electroscope and the pith-ball electroscope.
5 0
4 years ago
How many protons, neutrons, and electrons does a neutral atom of copper-65 have?
meriva

Answer:

An atom of Cu-63 has 34 neutrons and an atom of Cu-65 has 36 neutrons. 27- The total number of electrons in an atom of Cu-65 is 29 because copper has atomic number of 29, which simply means that an atom of copper has 29 protons and 29 electrons.

Explanation:

4 0
3 years ago
Read 2 more answers
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