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
inysia [295]
3 years ago
15

Ellen needs to move a heavy box across the floor and then place it on a shelf that is four feet above the floor. Which use of ma

chines would most likely require the least amount of force in order to get the box on the shelf?
A. sliding the box up an inclined plane to the shelf
B. rolling the box up an inclined plane on a cart
C. sliding the box across the floor and then lifting it using a pulley
D. rolling the box across the floor in a cart and then using a pulley
Physics
2 answers:
dusya [7]3 years ago
4 0
<span>D. rolling the box across the floor in a cart and then using a pulley </span>
slava [35]3 years ago
4 0

The answer among the choices is option C. Sliding the box across the floor and lifting it using a pulley.

You might be interested in
Martha must carry a 45 N package up three flights of stairs. Each flight of stairs has a height of 2.3m, and the actual distance
Darina [25.2K]

Answer:

310.5 J

Explanation:

The total work done by Martha is equal to the increase in gravitational potential energy of the package, which is equal to

\Delta U = mg\Delta h

where

(mg) = 45 N is the weight of the package

\Delta h is the increase in height of the package

The package is carried up 3 flights of stairs, each one with a height of 2.3 m, so the total increase in heigth is

\Delta h = 3 \cdot 2.3 m=6.9 m

And so, the work done by Martha is

U=(45 N)(6.9 m)=310.5 J

3 0
3 years ago
What will be the force if the particle's charge is tripled and the electric field strength is halved? Give your answer in terms
Alexus [3.1K]

Answer:

1.5F

Explanation:

Using

E= F/q

Where F= force

E= electric field

q=charge

F= Eq

So if qis tripled and E is halved we have

F= (E/2)3q

F= 1.5Eq=>> 1.5F

4 0
2 years ago
Jake is in chemistry class. He makes a list of the chemicals his instructor described and the properties of each.
koban [17]
Silver: bonds with other atoms because of the weak forces of the valence electrons 
FALSE - The strong forces of the valence electrons is actually the reason why silver bonds with other atoms.

Water: bonds allow for liquid state at room temperature and prevent conduction 
FALSE - Water is a good conductor.

Carbon: bonds with other atoms through strong shared electrical bonds 
TRUE - Carbon shares covalent bonds with other atoms.

Niobium: bonds allow for a strong conductivity found in stainless steel
FALSE - Iron and Carbon make up steel.
6 0
3 years ago
Read 2 more answers
Which officeholders are elected by the electoral college
NikAS [45]

Answer:Electoral Vote

Explanation:i did it before

4 0
2 years ago
PLEASE HELP ME WITH MY HOMEWORK!!!!!
IgorC [24]

Known :

l = 7 cm

w = 4 cm

Asked :

h = ...?

Answer :

V = B triangle × h (long)

35 = ½ × 4 × h × 7

35 = ½ × 28 × h

35 = 14 h

h = 35 ÷ 14

h = 2,5 cm

Sorry if I am wrong, I only study

5 0
3 years ago
Other questions:
  • A battery charges capacitor A until the potential difference between the two conductors of the capacitor is V.
    9·2 answers
  • Well into the twentieth century, many scientists believed the ocean floor was
    6·1 answer
  • As the diver jumps, the board bends down. At this point, what kind of energy does the board have?
    7·1 answer
  • A motorbike accelerates from rest at 12m/s in 3s on a level road. If the force is 3000n what is the total mass of the cyclist an
    14·2 answers
  • One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a s
    7·1 answer
  • 2. Which pair of objects has the largest gravitational force?
    8·1 answer
  • What is the main idea of the paragraph in one sentence?
    6·2 answers
  • 1. Black Panther ran 567.5 ks to the east in 2.3 hours then tumed around and ran 2218 km to
    7·1 answer
  • A 5kg cart moving to the right with a velocity of 16 m/s collides with a concrete wall and
    12·1 answer
  • If you jog for 1 hr and travel 10 km, the calculation of 10 km/hr describes your.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!