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
Varvara68 [4.7K]
3 years ago
14

Jill pulls on a rope to lift a 12 kg pail out of a well, while the clumsy Jack watches. For a 10.0 meter segment of the lift, sh

e lifts the bucket straight up at constant speed. How much power is required to complete this task in 5.0 seconds?
Physics
1 answer:
kvv77 [185]3 years ago
7 0
Definition of power is the amount of work done per unit of time:
P=\frac{W}{t}
We need to calculate the work done by Jill. 
Work is defined as the force acting along the path: 
W=F\cdot h
In this case, Jill is working against the force of gravity along the path of 10 meters:
W=mgh=12\cdot9.81\cdot 10=1177.2 J
Now we can calculate the power:
P=\frac{1177.2}{5}= 235.44 W
You might be interested in
Due to efficiency considerations related to its bow wake, the supersonic transport aircraft must maintain a cruising speed that
givi [52]

Answer:

decreases.

Explanation:

When the aircraft is flies from the warm air into the  colder air then its speed will be decreases.

as we know that

we know mach number is constant  

so that here Mach number M is expressed as  

M = \frac{u}{v}      .............................1

here u is  Local flow velocity with respect to the boundarie and v is the speed of sound in the medium

If the aircraft flies from hot air to cold air, the speed of sound in the medium will decrease. But the Mach number remains constant. Therefore, the local flow velocity relative to the boundaries also decreases.

7 0
3 years ago
What is the formula of finding displacement​
xenn [34]
Displacement is the final position of the object minus the initial position of the object.
Xf - Xi. Displacement is not the distance of the object. If you go to the right 10m and to the left another 10m, your displacement is 0m. But your distance is 20m
8 0
3 years ago
El Niño occurs every 2 to 12 years. true false
Novosadov [1.4K]
True
It is True I took the test
5 0
3 years ago
Read 2 more answers
Is is false or true The closer objects are, the stronger the gravitational force between them.
____ [38]

Answer:

<em>TRUE</em>

Explanation:

The gravitational force between two objects becomes<u><em> weaker</em></u><em> if the two objects are </em><u><em>moved apart</em></u> and <em>stronger</em><em> if they are brought </em><em>closer</em><em> together</em>; that is, the force depends on the distance between the objects

5 0
3 years ago
All of the following have been associated with amount of cortisol within the body except __________. A. experiencing problems wi
zhannawk [14.2K]

Answer: B. development of female sex

Development of female sex characteristic is not associated with the amount of cortisol in the body.

Explanation:

Cortisol is a steroid hormone secreted by the adrenal gland. It facilitates stress response, regulates blood sugar level and helps fight infections. High cortisol level leads to Cushing syndrome and low cortisol level leads to Addison disease.

Obesity is a  symptom of Cushing syndrome while weight loss is a symptom of Addison disease. Thus levels of cortisol can affect body weight as well.  When in a stressful situation, our body pumps excess cortisol.

Cortisol level in our body is generally high in the mornings and low in the midnight.

3 0
3 years ago
Read 2 more answers
Other questions:
  • Let’s consider several models of the Earth’s radiation properties. In each part, assume that the Earth's radiative output balanc
    5·1 answer
  • A river current has a velocity of 5 km/h relative to the shore. A boat moves in the same direction as the current at 4 km/h rela
    5·2 answers
  • The four giant gas planets that are made primarily of lightweight elements are
    8·1 answer
  • How much work is done when 0.0080 C is moved through a potential difference of 1.5 V?
    10·2 answers
  • Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?<br> es )))
    14·1 answer
  • What are different type of plastids explain them?​
    10·1 answer
  • The behavior of which objects are better explained by Einstein’s general theory of relativity than Newton’s universal law of gra
    14·2 answers
  • Although wave power does not produce pollution, some people may not want to invest in it because it is _____. 100 percent renewa
    8·2 answers
  • A 1400 kg car is moving at 33.8 m/s when a force is applied the opposite direction of the car's motion. The car slows down to 21
    12·1 answer
  • Based on this how many Carbon<br> Atoms would be on the products <br> Side
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!