All categories

3 years ago

The efficiency of a screw is low because of _____.

Physics

2 answers:

Alla [95]3 years ago

7 0

Answer:

The efficiency of a screw is low because of friction.

Explanation:

A screw is a simple machine that is used to convert a torque to linear force and rotational motion to linear motion. The efficiency of a screw is given by :

$\eta=\dfrac{Fl}{2\pi T}$

Where

l = pitch distance in mm

T = torque in N-m

The efficiency of screw is less because the output is less as compared to input or there is more input than output. This implies that there is more friction.

Hence, the correct option is (b) "friction".

AfilCa [17]3 years ago

6 0

The correct answer that would best complete the given statement above would be the second option. A screw is an inclined plane wrapped around a cylinder. The efficiency of a screw is low because there is more input than output. In other words, it is because of friction. Hope this answer helps.

You might be interested in

Houses with carpet are much quieter than houses with tile or hardwood floors because of sound wave A) absorption. B) diffraction

fgiga [73]

Answer 
A). Absorption

Explanation 
Sound travels inform of waves. Waves have certain properties. They can be reflected, diffracted refracted, they can also be absorbed. Some materials such as cotton and other soft materials absorbs wave sounds. When this waves are absorbs sound cannot be heard.
For this reason, houses with carpet are much quieter because carpet absorbs sound wave better than hardwood, and tiles.

6 0

4 years ago

Read 2 more answers

In the fastest measured tennis serve, the ball left the racquet at 73.14 m/s . A served tennis ball is typically in contact with

Dominik [7]

Answer:

2.286 km/s²

Explanation:

Since acceleration a = (v - u)/t where u = initial horizontal velocity of ball = 0 m/s (since it starts from rest), v = final horizontal velocity of ball at serve = 73.14 m/s and t = time taken for serve = 32.0 ms = 0.032 s

Substituting the values of the variables into the equation, we have

a = (v - u)/t

a = (73.14 m/s - 0 m/s)/0.032 s

a = 73.14 m/s/0.032 s

a = 2285.625 m/s²

a = 2.285625 km/s²

a ≅ 2.286 km/s²

So, the x - component of the ball's acceleration during the serve is 2.286 km/s²

5 0

3 years ago

A force is applied to a 2.8 kg mass and produces 3.9 m/s 2 acceleration. what acceleration would be produced by the same force a

OverLord2011 [107]

Force applied on first mass = 2.8×3.9 = 10.92N
same force = 8.2×a
therefore
a = 10.92÷8.2 = 1.33ms-²

3 0

4 years ago

Many people confuse the terms energy, work, and power. Explain how they are alike and how they are different

nikitadnepr [17]

Work, is the speed at which energy transfers.
Energy, is the capacity to do work.
Power, is the rate at which work is done.

3 0

3 years ago

A high-speed ""bullet"" train accelerates and decelerates at the rate 4 ft/s 2 . Its maximum cruising speed is 90 mi/hr. (a) Wha

NemiM [27]

Answer:

23 mi

Explanation:

Let us first record all the values we have

acceleration = 4 ft/s

max speed = 90 mi/hr * 1 hr/3600s * 5280 ft/1 mi = 132 ft/s

We can use the equation of linear motion since acceleration is constant

distance covered = distance during acceleration + distance during costant

velocity

$s = \frac{v_{f} ^{2} - v_{i} ^{2} }{2a} + v_{i}t\\\\s = \frac{132 ^{2} - 0^{2} }{2*4} + 132*900\\s = 120 978ft$

distance in miles = 120 978 ft * 1 mi/5280 ft = 22.9125 mi ≈ 23 mi

4 0

3 years ago