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
givi [52]
3 years ago
7

Un ascensor sube con una velocidad constante de 2 m/s. Un niño que va en el ascensor lanza una piedra de 0.6 kg hacia arriba con

una velocidad de 5 m/s con relación al ascensor.
Obténgase:
a) el trabajo efectuado por el niño para lanzar la piedra,
Physics
1 answer:
Natasha_Volkova [10]3 years ago
6 0

Answer:

W = 7.5 J

Explanation:

W = KE

W = ½mv² = ½0.6(5²) = 7.5 J

Niño, piedra y ascensor están todos en el mismo marco de referencia inercial.

los 2 m / s no son importantes.

You might be interested in
There is a very slight change in gravity at the top of a mountain. Which property
son4ous [18]

Answer:

The entity that decreases is the Weight.

Explanation:

Every object on the surface of the earth is usually pulled downwards by the action of gravity. The force or weight is W = mg

Now, the farther one gets away from the surface of the earth by climbing a mountain, the further the person is from the Earth's centre of gravity.

We know that the formula for Force of gravity away from the Earth's surface is given by;

F_g = GM1M2/r²

So the greater the distance, the lesser the gravitational force.

Now, the gravitational force equals the weight of the individual.

Thus, the entity that decreases is the Weight of the individual.

8 0
3 years ago
What is an example of convection? A. A heater in a fish tank warming the water at the bottom of the tank B. Batteries in a flash
Keith_Richards [23]

Answer: C. Touching the stove and burning your hand

6 0
4 years ago
Read 2 more answers
the rover uses 4GHz frequency to transmit the picture. The rover’s transmission power is 200W. The transmission antenna gain is
Gnoma [55]

Answer:

A rover uses 4GHz frequency to transmit a picture. The rover’s transmission power is 200W. Distance = 55*10^9m. The transmission antenna gain is 10,000 and the receiving antenna gain is 100,000. What is the received signal strength at the Earth’s station, in W (assume Pi = 3.14)?

= 31.5 db

Explanation:

Path loss = 20㏒₁₀(4πdf / c)

               = 20㏒₁₀(d) + 20㏒₁₀(f) - 20㏒₁₀(4π / c)

               = 20㏒₁₀(55 × 10⁹) + 20㏒₁₀(4000) - 147.5

               = (20 × 77.4) + 20 ×  3.6 - 147.5

               = 154 + 72 - 147.5

               = 78.5 DB

Received signal strength(power)

Pr = Pt + Gt + Gr - Lp dBW

= 20 + 40 + 50 - 78.5

= 31.5 db

7 0
3 years ago
Technician A says that failure analysis will assist the technician in determining whether it is more cost effective to replace r
Jobisdone [24]

Answer:

The correct option is;

Technician A

Explanation:

Here we note  failure analysis will assist in determining the cause of failure and as such to determine the cost effectiveness of a repair or a replacement.

However, a warranty is a legal contract between the buyer of the engine and the manufacturer for the manufacturer to either repair the engine or compensate the the customer for all failures that occur within the period of the warranty. Therefore, technician B is not correct as he says the manufacturer may request the engine for analysis on why it failed which is not the same as the basis of a warranty.

6 0
3 years ago
How many simple machines are in a wine opener? The kind with the bottle opener at the head and two "arms."
Blababa [14]
It uses the corkscrew to anchor it to the cork and a lever to pull the cork out

Hope this helps buddy:D
7 0
3 years ago
Read 2 more answers
Other questions:
  • Is glass weigh more than wood
    10·2 answers
  • The radius of an atom is 0.5a what is the atomic volume of one mole of hydrogen<br>​
    7·1 answer
  • Which two statements are true about energy transformations?
    6·2 answers
  • Which of the following is a source of direct electric current?
    14·2 answers
  • How is gravitational force of earth is responsible for rainfall and snowfall
    12·1 answer
  • A kitten sits in a lightweight basket near the edge of a table. A person accidentally knocks the basket off the table. As the ki
    14·1 answer
  • Sound travels slowest through gas because the atoms in a gas are further apart than the other states of matter.
    11·1 answer
  • The light ray is traveling from Acrylite into air. The refractive index for air is 1.00. If the angle of incidence and the angle
    12·1 answer
  • What's newtons second law​
    6·1 answer
  • Why a surface that always have a perpendicular is an equipotential
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!