1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Katyanochek1 [597]
2 years ago
6

1. A particular lever is 90.0% efficient. If 50.0 J of work are done on the lever, then how much work does the lever do on its l

oad? 2.The mechanical advantage of a pulley system is 4.00. Using this pulley system, how much force do you need to exert to lift a 500.0 N box?
Physics
1 answer:
laila [671]2 years ago
8 0

Answer:

Explanation:

Using the efficiency formula;

Efficiency = Work done by the machine (output)/work done on the machine (input) ×100%

Efficiency =w/50 ×100

90 = 100w/50

Cross multiply

90×50 = 100W

4500 = 100W

W = 4500/100

W = 45Joules

Hence the lever does 45Joules of work on its load

2) Mechanical Advantage= Load/Effort

Given

MA = 4

Load = 500N

4 = 500/Effort

Effort = 500/4

Effort =125N

Hence the effort required to lift the load is 125N

You might be interested in
4. Why do you think people in south Louisiana specialize in seafood?
lbvjy [14]

Answer:

gang

Explanation:

yupppp

7 0
3 years ago
A 27 kg bear slides, from rest, 14 m down a lodgepole pine tree, moving with a speed of 6.1 m/s just before hitting the ground.
Nadusha1986 [10]
<h2>Thus the force of friction is 235 N</h2>

Explanation:

When the bear was at the height of 14 m . Its potential energy = m g h

here m is the mass of bear , g is acceleration due to gravity and h is the height .

Thus P.E =  27 x 10 x 14 = 3780 J

The K.E of the bear just before hitting = \frac{1}{2} m v²

=   \frac{1}{2} x 27 x ( 6.1 )²  = 490 J

The force of friction f = P.E - K.E = 3290 J

Because the work done = Force x Distance

Thus frictional force = \frac{3290}{14} = 235 N

3 0
3 years ago
How is biomass energy better than geothermal energy
aleksklad [387]
If you search that click the first link ;)
5 0
3 years ago
How is the phenomenon of reflection used in making a kaleidoscope​
dusya [7]

Answer:

The kaleidoscope

Explanation:

gives a number of images formed by reflection from the mirrors inclined to one another. Designers and artists use kaleidoscope to get ideas for new patterns to design wallpapers, jewellery and fabrics.

8 0
3 years ago
HELP ASAP!! <br> In 3-4 sentences, briefly summarize how our solar system formed.
Pachacha [2.7K]

Answer:

Explanation:

Our solar system is formed by a dust storm, which created the planets. This info is grabbed by NASA, and people believe this is how the Solar System is formed. The sun is formed like this too.

5 0
3 years ago
Read 2 more answers
Other questions:
  • When the net force of opposite forces is zero, the forces are
    5·2 answers
  • In a thunder and lightning storm there is a rule of thumb that many people follow. After seeing the lightning, count seconds to
    11·1 answer
  • A 69 kg zebra is traveling 7 m/s east. What is the zebra’s momentum? kg-m/s
    5·1 answer
  • An elevator cable breaks when a 925-kg elevator is 28.5 m above the top of a huge spring Ak = 8.00 * 104 N????mB at the bottom o
    14·2 answers
  • 10 points
    15·1 answer
  • How can we magnetise a piece of iron.
    13·1 answer
  • The resistance of the light bulb changed as the voltage (and current) changed. Why does this resistance change occur?
    11·1 answer
  • Gravity does not actually "pull" objects at
    5·1 answer
  • A car traveled 210 km in 1.5 hrs, what was the car's average speed?
    5·1 answer
  • Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 4930 km .
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!