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
bekas [8.4K]
3 years ago
5

A cannonball is fired in such a way

Physics
1 answer:
Goryan [66]3 years ago
5 0

Answer:

θ = 53.13° above horizontal

Explanation:

Ignore air resistance.

The time the ball takes to reach its max height will equal the time to travel half the max range R.

√(2h/g) = (R/2)/vcosθ

vsinθ/g = R/2vcosθ

2v²sinθcosθ = Rg

2v²sinθcosθ = 3hg

v² = u² + 2gh

0² = v²sin²θ + 2gh

v²sin²θ = 2gh

v² = 2gh/sin²θ

               2v²sinθcosθ = 3hg

(2gh/sin²θ)2sinθcosθ = 3hg

            (2/sinθ)2cosθ = 3

                            cotθ = 3/4

                                 θ = 53.130

You might be interested in
Consider a monochromatic electromagnetic plane wave propagating in the x direction. At a particular point in space, the magnitud
weqwewe [10]

Answer:

a)   S = 2.35 10³   J/m²2 ,  

b)and the tape recorder must be in the positive Z-axis direction.

the answer is 5

c) the direction of the positive x axis

Explanation:

a) The Poynting vector or intensity of an electromagnetic wave is

          S = 1 /μ₀ E x B

if we use that the fields are in phase

          B = E / c

we substitute

         S = E² /μ₀ c

let's calculate

        s = 941 2 / (4π 10⁻⁷  3 10⁸)

        S = 2.35 10³   J/m²2

 

b) the two fields are perpendicular to each other and in the direction of propagation of the radiation

In this case, the electro field is in the y direction and the wave propagates in the ax direction, so the magnetic cap must be in the y-axis direction, and the tape recorder must be in the positive Z-axis direction.

the answer is 5

C) The poynting electrode has the direction of the electric field, by which or which should be in the direction of the positive x axis

4 0
3 years ago
_______ can be generally defined as a change in position. A. Volume B. Force C. Motion D. Mass
Law Incorporation [45]
C. motion can be defined as change in position.
8 0
4 years ago
Read 2 more answers
When the mass of a body is constant, then its acceleration is directly proportional to the force acting on it. When the force ac
Fed [463]

Answer:

True

Explanation:

8 0
3 years ago
Read 2 more answers
State Pascal''s principle. Give and example of its use
BabaBlast [244]
Well, it is also known as the transmission of fluid pressure. So, it is a principle in fluid mechanics that says that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such as the the pressure variations.
4 0
4 years ago
Hell please thanks!!!!!!’
Slav-nsk [51]

Answer:

liquid phase

Explanation:

it is liquid phase because molecules are not that tightly packed as solid and not that far away from each other as in gas phase.

5 0
3 years ago
Other questions:
  • The symbols for elements have either
    5·1 answer
  • How does the ocean influence climate?
    14·1 answer
  • The Vast Majority of all stars in the universe belong to which group?
    5·1 answer
  • While riding in a moving car, you toss an egg directly upward. Does the egg tend to land behind you, in front of you, or back in
    15·1 answer
  • What is the common name for tropospheric ozone
    8·1 answer
  • During a hurricane in 2008, the Westin Hotel in downtownNew Orleans suffered damage. Suppose a piece of glass dropped near the t
    7·1 answer
  • Is current was invented ​
    12·1 answer
  • Based on its location on the periodic table, which element is the best
    6·2 answers
  • Which of the following statements is false?
    12·1 answer
  • Which describes how to calculate density?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!