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
just olya [345]
3 years ago
12

kid shoots a BB gun directly upward at a ock of birds. The initial velocity of the BB is21 m/s. If the BB hits a bird at less th

an 1 m/s then it will not harm the bird. Calculate the minimumheight above the gun at which the birds may safely y. Use a magnitude of acceleration of 9.8m
Physics
1 answer:
Mademuasel [1]3 years ago
3 0

Answer:

22.5 m

Explanation:

Using v² = u² - 2gy where u = initial velocity of BB = 21 m/s, v = final velocity of BB = 1 m/s (since this is the required speed of BB in which it will not harm the birds), g = acceleration due to gravity = 9.8 m/s² and y = minimum height of BB above the gun at which the birds may safely fly.

Substituting the values of the variables into the equation, we have

v² = u² - 2gy

(1 m/s)² = (21 m/s)² - 2(9.8 m/s²)y

collecting like terms, we have

(1 m/s)² - (21 m/s)² = - 2(9.8 m/s²)y

1 m²/s² - 441 m²/s² = -(19.6 m/s²)y

simplifying, we have

- 440 m²/s² = -(19.6 m/s²)y

dividing through by -19.6 m/s², we have

y = - 440 m²/s² ÷ -19.6 m/s²

y = 22.45 m

y ≅ 22.5 m

You might be interested in
What causes interstellar dust and clouds into plants and stars
AnnZ [28]
I assume you mean planets eitherway interstellar dust and clouds have solid material and as well as minerals such as iron and over time solid chuncks start to fuse together and make a planet but with stars however it is different because a star has a little solid core surrounded by gasses (hydrogen and helium) to produce heat in a method called nuclear fusion so interstellar clouds contain gasses as well and solids as I previously said and form a star as well

this is from my understanding
5 0
4 years ago
NO ONE WILL HELP ME!!! IT'S MULTIPLE CHOICE!!! PLEASE HELP!!!
mario62 [17]
I think the first one is 40*40
8 0
4 years ago
Read 2 more answers
Estimate under what set of conditions it is possible, despite the spherical shape of the working electrode, to use linear diffus
goldfiish [28.3K]

When the experimental measurements diverge at very low values of the voltages. When the ratio of current to saturated current is very small. That is, i/I less than or equal to 1/100. When there is a finite current at Voltage

V = 0

Diffusion will have influence on current - voltage curve in the working electrode which is ionization detector.

The estimation under set of conditions that is possible, despite the spherical shape of the working electrode, to use linear diffusion equations to theoretically predict the current vs voltage curve expected in this experiment will be:

  • When the experimental measurements diverge at very low values of the voltages
  • when the ratio of current to saturated current is very small. That is, i/I less than or equal to 1/100
  • When there is a finite current at Voltage V = 0

Where

i = electric current

I = saturated current

V = voltage supplied

The curve expected will therefore give exponential curve from positive to negative domain because of the diffusion of ions from different directions

Learn more here: brainly.com/question/23985719

8 0
3 years ago
Physics is the study of matter and energy and their relationships.<br><br> True<br> False
prohojiy [21]
False because the physics is like a science and it’s like a math
8 0
3 years ago
Read 2 more answers
Coulomb's law is expressed mathematically as
nataly862011 [7]
Force between two charges  = 

     ( 1/4πε₀ ) · (Charge #1) · (Charge #2) / (Distance between them)²

  in the direction away from each other.

In other words, if the force is positive, the charges are repelling.
If the force is negative, the charges are attracting.
4 0
3 years ago
Other questions:
  • A pair of 10 μf capacitors in a high-power laser are charged to 1.7 kv. how much energy is stored in each capacitor
    15·2 answers
  • A spherical capacitor contains a charge of 3.50 nC when connected to a potential difference of 230.0 V. Its plates are separated
    8·1 answer
  • Lila is a track and field athlete. She must complete four laps around a circular track. The track itself is a 400 meter track an
    8·2 answers
  • The radar gun measures the frequency of the radar pulse echoing off your car. By what percentage is the measured frequency diffe
    7·1 answer
  • What is the acceleration of the car at segment C? 30 m/s2, –30 m/s2, 40 m/s2, or –40 m/s2
    12·2 answers
  • Use the mass spectrum of europium to determine the atomic mass of europium. where the peak representing eu-151 has an exact mass
    8·2 answers
  • When Marie sees the red traffic light, Marie brakes to a halt from a speed of 70 m/s in just 2 seconds. What is her deceleration
    6·1 answer
  • Match the following ERA’s Question 4
    10·1 answer
  • A ball is gently dropped from a height of 20 m. If its velocity Increases uniformly at the rate of 10 m s2, with what velocity w
    6·2 answers
  • After meeting the end the wave willa- reflect with larger amplitude.b- disappear.c- reflect with the same displacement. (not inv
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!