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
zhenek [66]
3 years ago
13

Sheila did 110 J of work to move a chair 2 m to the right. How much force did Sheila use to Sheila use to move the chair

Physics
2 answers:
lutik1710 [3]3 years ago
8 0
Work = Force*Distance

Force = Work/Distance
110/2=55 N
satela [25.4K]3 years ago
4 0

Work done =  Force * Distance moved in the direction of the force.

110 J          =    F  * 2 m

110/2 =    F
55  = F

Therefore, force is 55N.
You might be interested in
The length of a football field is closest to<br> (1) 1000 cm (3) 1000 km<br> (2) 1000 dm (4) 1000 mm
Sergeu [11.5K]

For this case, the first thing you should know is that the length of a football field is around 100 meters.

We must then look for a measure close to this value.

We have the following unit conversion:

1 meter = 10 decimeters

Applying the conversion we have:

(1000 dm)*(\frac{1}{10} \frac{m}{dm}) = 100 m

Therefore, the measure closest to a soccer field is:

1000 dm

Answer:

The length of a football field is closest to:

(2) 1000 dm

5 0
3 years ago
Read 2 more answers
Two people stand facing each other at roller skating rink then push off each other
9966 [12]

a) 0 kg m/s

b) 0 kg m/s

c) +3 m/s

d) 60 N

Explanation:

a)

The momentum of an object is a vector quantity given by:

p=mv

where

m is the mass of the object

v is the velocity of the object

In this problem, we have a system of two people, so the total momentum will be the sum of the individual momenta of the two people:

p=p_1 + p_2

Which can be rewritten as

p=m_1 u_1 + m_2 u_2

where m_1,m_2 are the masses of the two people and u_1,u_2 their initial velocities.

However, the two people are initially at rest, so

u_1 = 0\\u_2 = 0

Therefore the total momentum is

p=0+0=0

b)

The principle of conservation of momentum states that when there are no external forces acting on a system, the total momentum of the system is conserved, so we can write:

p_i = p_f

where

p_i is the total momentum of the system before

p_f is the total momentum of the system after

In this problem,

p_i = 0

As we calculated in part a: this is because the total momentum of the two people before they push off each other is zero.

Therefore, according to the law of conservation of momentum,

p_f = p_i = 0

So the total momentum is zero also after they push off each other.

c)

The total momentum of the girl and the boy after they push off each other can be written as:

p_f = m_1 v_1 + m_2 v_2 (1)

where:

m_1 = 30 kg is the mass of the girl

v_1 = -5 m/s is her velocity (she moves backward, so the negative sign)

m_2 = 50 kg is the mass of the boy

v_2 is the velocity of the boy

As calculated in part b), we also know that the total momentum of the girl and the boy is

p_f = 0 (2)

By combining eq(1) and eq(2) we get

0=m_1 v_1 + m_2 v_2

And solving for v2 we find the velocity of the boy:

v_2=-\frac{m_1 v_1}{m_2}=-\frac{(30)(-5)}{50}=+3 m/s

and the positive sign means he is moving forward.

d)

We can solve this part by applying the impulse theorem, which states that the change in momentum of an object is equal to the product between the force applied on it and the duration of the collision:

\Delta p = F\Delta t

where

\Delta p is the change in momentum

F is the force

\Delta t is the time during which the force is applied

In this problem:

\Delta t = 2.5 s

For the boy, the change in momentum is:

\Delta p = m_2 (v_2 - u_2)

And since

m_2 = 50 kg\\u_2 = 0 m/s\\v_2 = 3 m/s

We have

\Delta p = (50)(3-0)=150 kg m/s

So, the force exerted between the boy and the girl is:

F=\frac{\Delta p}{\Delta t}=\frac{150}{2.5}=60 N

8 0
3 years ago
Devon has several toy car bodies and motors. The motors have the same mass, but they provide different amounts of force, as show
Grace [21]

Answer:

pretty sure its motor 2, with body 1

Explanation:

4 0
3 years ago
Read 2 more answers
Think of an animal and list two resources that it might compete for in its community . Then describe what adaptions the animals
Viefleur [7K]
An animal is a lion, it may compete for food and it’s territory. The animal may have to fight other animals to get these things
6 0
3 years ago
Describe the main distinguishing features of spiral, elliptical, and irregular galaxies.
hram777 [196]

Answer:

Spiral galaxies consist of a flat, rotating disk of stars, gas and dust, and a central concentration of stars known as the bulge. These are surrounded by a much fainter halo of stars, many of which reside in globular clusters.

Elliptical galaxies have smooth, featureless light-profiles and range in shape from nearly spherical to highly flattened, and in size from hundreds of millions to over one trillion stars. In the outer regions, many stars are grouped into globular clusters. Most elliptical galaxies are composed of older, low-mass stars, with a sparse interstellar medium and minimal star formation activity They are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure. Collectively they are thought to make up about a quarter of all galaxies.

irregular galaxies were once spiral or elliptical galaxies but were deformed by gravitational action. they are shapeless.

5 0
3 years ago
Other questions:
  • Una cuerda de violin vibra con una frecuencia fundamental de 435 Hz. Cual sera su frecuencia de vibracion si se le somete a una
    15·1 answer
  • In some states, the highway patrol uses planes carrying radar devices to monitor traffic. As the plane flies over traffic, the r
    8·2 answers
  • Instantaneous speed is measured
    14·1 answer
  • A rock from space in Earth's Atmosphere would be considered?
    6·1 answer
  • Which kind of pressure prevents stars of extremely large mass from forming?
    15·2 answers
  • A force of 10 lb is required to hold a spring stretched 4 in. beyond its natural length. How much work W is done in stretching i
    13·2 answers
  • If a jumping frog can give itself the same initial speed regardless of the direction in which it jumps (forward or straight up),
    10·1 answer
  • True or false: Equilibrium occurs when the quantity supplied exceeds the quantity demanded.
    9·2 answers
  • What happens to molecules when their kinetic energy decreases?
    9·1 answer
  • Anything that has volume or mass
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!