A simple machine has an efficiency of 0.75 and velocity ratio 12. Then what is the load that can be moved if an effort of 100N is applied?
Anonymous Quiz
20%
9N
57%
900N
13%
75N
10%
1200N
An effort is 200N is applied on to a wedge of 4cm thick and 12cm long to split a log of 500N into parts. Then what is the efficiency of the wedge?
Anonymous Quiz
47%
83.33%
28%
75%
17%
80. 34%
8%
66.67%
Which simple machine can not be used to increase force?
Anonymous Quiz
21%
Lever
25%
Wheel and axle
40%
Fixed pulley
15%
Movable pulley
❤1
A 10cm long and 2cm wide metal wedge is used to split a wood. What is the velocity ratio of the wedge?
Anonymous Quiz
9%
3
28%
0.2
51%
5
12%
20
A screw shaft has a diameter of 4cm and its adjacent threads are 0.314cm apart. What is the velocity ratio of the screw?
Anonymous Quiz
15%
10
29%
20
27%
30
29%
40
👍8
If an inclined plane of 4m length and 1m height has an efficiency of 0.5, what is its mechanical advantage?
Anonymous Quiz
10%
3
78%
2
11%
5
2%
6
Which one of the following statement is true about the classes of lever in simple machines?
Anonymous Quiz
51%
In 2nd class lever, load is located between effort and fulcrum.
25%
In 3rd class lever, fulcrum is located between load and effort.
15%
In 1st class lever, effort is located between fulcrum and load.
8%
In 2nd class lever, VR is less than MA.
Which one of the following statement is true about simple machines?
Anonymous Quiz
12%
If the machine is speed multipliers, then its VR > 1 due to its distance moved by load is large.
31%
If the machine is force multipliers, then its MA is greater than VR due to its load is large.
26%
If the machine has no energy loses, its efficiency is greater than 1 due to its MA is equal to VR.
31%
If the machine is force multipliers, its VR > 1 due to its distance moved by load is less.
If the efficiency of one machine is 100%, then which one of the following is not true?
Anonymous Quiz
12%
Its velocity ratio is equal to MA.
20%
Its IMA is equal to its AMA.
27%
There is no energy loses in the machine.
41%
The types of machines must be inclined plane, screw, and wedge to get 100% efficiency.
A 200N force is required to be applied at one end of 1m long lever. If the distance from the effort to fulcrum is 80cm, inorder to lift a load of 600N placed at the other end. What is the efficiency of the lever?
Anonymous Quiz
17%
83%
47%
75%
15%
17%
21%
25%
👍2
Which one of the following is NOT true about pulley systems?
Anonymous Quiz
26%
Fixed pulley has velocity ratio of 2.
21%
Movable pulley has velocity ratio of 2.
35%
Compound pulley is a combination of fixed and movable pulley.
18%
Fixed pulley has no mechanical advantage.
Forwarded from Maths Group11
❤2
Aster is as ____________ as Tola.
Anonymous Quiz
72%
short
14%
shorter than
7%
the shortest
7%
shorter
❤6
❤6
He enjoys _________ to music everyday.
Anonymous Quiz
27%
listen
59%
listening
10%
to listen
3%
listened
The book ____________ by our teacher a year ago.
Anonymous Quiz
17%
is written
71%
was written
9%
wrote
3%
were written
Before she reached to us, we ____________ her for a long time.
Anonymous Quiz
9%
have waited
33%
have been waiting
30%
had waited
28%
had been waiting
❤1
What is the sum of the roots of quadratic equation x² + 5x + 6 = 0 ?
Anonymous Quiz
18%
6
20%
-6
25%
5
36%
-5
❤1
Let A = {1,3,5,7} and B = {2, 4, 6, 8}, then what is A intersection of B?
Anonymous Quiz
85%
{ }
3%
{1}
7%
{1, 3}
5%
{{2, 3}, 5}