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
vampirchik [111]
3 years ago
12

Se lanza una pelota de béisbol desde la azotea de un edificio de 25 m de altura con velocidad inicial de magnitud 10 m/s y dirig

ida con un ángulo de 63.1° sobre la horizontal. A) ¿Qué rapidez tiene la pelota justo antes de tocar el suelo? Use métodos de energía y desprecie la resistencia del aire.
Physics
1 answer:
MissTica3 years ago
6 0

Answer:

 v_f = 24.3 m / s

Explanation:

A) In this exercise there is no friction so energy is conserved.

Starting point. On the roof of the building

         Em₀ = K + U = ½ m v₀² + m g y₀

Final point. On the floor

         Em_f = K = ½ m v_f²

         Emo = Em_g

         ½ m v₀² + m g y₀ = ½ m v_f²

        v_f² = v₀² + 2 g y₀

         

let's calculate

        v_f = √(10² + 2 9.8 25)

        v_f = 24.3 m / s

You might be interested in
When non-metric units were used in the United Kingdom, a unit of mass called the pound-mass (lbm) was employed, where 1lbm=0.453
Drupady [299]

Answer:

a) 0.022%

b) 10014.32 lb

Explanation:

a) Percentage uncertainty would be

0.0001\times \frac{100}{0.4539}=0.022%

Percent uncertainty is 0.022%

b) For 1 kg uncertainty mass in kg would be

\frac{1}{0.022}\times {100}=4545.5\ kg

Mass in pounds would be

\frac{4545.5}{0.4539}=10014.32\ lb

Mass in pound-mass is 10014.32 lb

8 0
3 years ago
The LIGHT/DARKcontrol of an automatic toaster is placed at a particular setting. The toast at this setting will always be the sa
hichkok12 [17]
The toast at this setting will always be the same color because the toaster uses a compensating thermostat. Depending on the setting, the compensating thermostat will be used to regulate the heat settings at different amounts of time. In one setting, the compensating thermostat could go on for much longer than the other setting before shutting off.
5 0
3 years ago
The standard measure used to compare sound intensities is the ______ .
uranmaximum [27]
The answer is Decibels. <span />
4 0
3 years ago
Read 2 more answers
What is the difference between work done by fuel and work done by moving object??<br>​
Arturiano [62]

Answer:

work done by fuel is conversion of chemical energy into mechanical whereas work done by moving object is due to its displacement by the application of force. actually, both of them give same meaning

3 0
2 years ago
Read 2 more answers
Does anyone know what these three are? I need help!
VashaNatasha [74]

Answer:

1. A

2. C

3. A

Explanation:

I'm so sorry if I am wrong

3 0
3 years ago
Other questions:
  • Why does the percentage of water vapor vary?
    10·1 answer
  • (WILL MARK BRAINLIEST AND 22pts) As the earth travels around the sun, the sun is always at one focus of an ellipse. What's at th
    12·2 answers
  • Will upvote!!!!
    13·2 answers
  • Do your relationships tend to have this quality?
    7·2 answers
  • Lithium has 3 protons. how many neutrons are in the isotope lithium -8
    15·2 answers
  • The back shelf of a car has a physics textbook on it. The coefficient of static friction of 0.44 between the book and the surfac
    11·1 answer
  • Consider the average speed of a runner who jogs around a track four times. The distance (400m) remains constant for each lap. Ho
    9·1 answer
  • What is the potential energy of a 32 kg child sitting on the floor? Explain.
    15·1 answer
  • A car of weight 11000 N moves with constant velocity along a horizontal road.A driving force of 5000 N acts on the car what is t
    14·1 answer
  • Riding a bicycle on a flat, smooth surface is a lot easier than riding it along a bumpy surface or up a hill. A bumpy surface cr
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!