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
Scrat [10]
3 years ago
6

A projectile lands at the same height from which it was launched. which initial velocity will result

Physics
1 answer:
Serhud [2]3 years ago
5 0

The required initial velocity that will result if a projectile lands at the same height from which it was launched is V₀ = V cosθ

First, we must understand that the component of the velocity along the vertical is due to maximum height achieved and expressed as usin θ.

The component of the velocity along the horizontal is due to the range of the object and is expressed as ucosθ.

If the <u>air resistance is ignored</u>, the velocity of the object will be constant throughout the flight and the initial velocity will be equal to the final velocity.

Hence the required initial velocity that will result if a projectile lands at the same height from which it was launched is V₀ = V cosθ

Learn more here; brainly.com/question/12870645

You might be interested in
A metal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpend
andrezito [222]

Answer:

Explanation:

We have a metal ring of diameter

d = 4.2cm = 0.042m

r = d/2 = 0.021m

And it is place between the north pole and south pole of a large magnet with the plane of it's area perpendicular to the magnetic field.

Given that the magnetic field is

B = 1.12 T

The rate of decrease of magnetic field is 0.2T/s, since it is decrease then,

dB/dt = -0.2 T/s

The induce electric field is given as,

From faradays law

ε = ∫E•dl = -dΦ/dt

Magnetic flux is given as

Φ = BA

Φ = πr²×B = πr²B

Also, ∫E•dl = E×2πr = 2πrE

So,

∫E•dl = -dΦ/dt

2πrE = -d(πr²B) / dt

r is a constant, then

2πrE = -πr² dB/dt

Divide both side by πr

2E = -r dB/dt

E = -r dB/dt / 2

E = -0.021 × -0.2 / 2

E = 0.0021 V/m

The magnetic field point from north to south pole and it is decreasing and this means that the magnetic flux is also decreasing, so the induce magnetic field must point in the same direction of the original magnetic field, so the induce current circulate counter-clockwise as viewed from the south pole

5 0
3 years ago
What is the magnitude of the velocity of a 25 kg mass that is moving with a momentum of 100 kg*m/s?
Gekata [30.6K]

Answer:

v= 4 m/s

Explanation:

Momenutm is, by definition, the product of mass and velocity.

p = mv

Let's replace what we know and solve for whatever's left

100 kg\cdot m/s = 25kg \cdot v \rightarrow v= 4 m/s

7 0
3 years ago
Michelle recently started selling her invention: A bed that looks like it floats in mid-air. The bed is actually suspended by ma
Tamiku [17]

Answer:

Explanation:

designer

illusionist

engineer

entrepreneur

salesperson

human

inventor

8 0
2 years ago
A 20-kg boy slides down a smooth, snow-covered hill on a plastic disk. The hill is at a 10° angle to the horizontal, and the slo
zvonat [6]

Answer:

13 m/s

Explanation:

I assume we are ignoring friction.

The boy's PE will all be converted to KE at the bottom of the hill.

to find PE = mgh   we need to know h

   h = 50 sin 10 = 8.68 meters

     then:    PE = 20 * 9.81 * 8.68 =<u> 1703.49</u> j

KE = 1/2 m v^2 = <u>1703 .49</u>

            v = 13 m/s

7 0
2 years ago
By calculating its wavelength (in nm), show that the second line in the Lyman series is UV radiation.
Rashid [163]

Answer:

 λ = 102.78  nm

This radiation is in the UV range,

Explanation:

Bohr's atomic model for the hydrogen atom states that the energy is

           E = - 13.606 / n²

where 13.606 eV   is the ground state energy and n is an integer

an atom transition is the jump of an electron from an initial state to a final state of lesser emergy

            ΔE = 13.606 (1 / n_{f}^{2} - 1 / n_{i}^{2})

the so-called Lyman series occurs when the final state nf = 1, so the second line occurs when ni = 3, let's calculate the energy of the emitted photon

            DE = 13.606 (1/1 - 1/3²)

            DE = 12.094 eV

let's reduce the energy to the SI system

            DE = 12.094 eV (1.6 10⁻¹⁹ J / 1 ev) = 10.35 10⁻¹⁹ J

let's find the wavelength is this energy, let's use Planck's equation to find the frequency

            E = h f

             f = E / h

            f = 19.35 10⁻¹⁹ / 6.63 10⁻³⁴

            f = 2.9186 10¹⁵ Hz

now we can look up the wavelength

           c = λ f

           λ = c / f

           λ = 3 10⁸ / 2.9186 10¹⁵

           λ = 1.0278  10⁻⁷ m

let's reduce to nm

            λ = 102.78  nm

This radiation is in the UV range, which occurs for wavelengths less than 400 nm.

5 0
3 years ago
Other questions:
  • Write any two importance of health education​
    15·1 answer
  • Se lanza hacia abajo un cuerpo de masa 2 kg con una velocidad de 1 m/s
    13·1 answer
  • Two particles, with identical positive charges and a separation of 2.85 x 10⁻² m, are released from rest. Immediately after the
    6·1 answer
  • According to the kinetic theory of gas particles, when do gas particles have some type of force between them?
    7·2 answers
  • The height of the Empire State Building is 318.00 meters. If a stone is dropped from the top of the building, what is the stone'
    8·1 answer
  • If X = 5 and Y = 3, what does Z equal? <br> 2X + 2Z = 10Y
    13·2 answers
  • Two bumper cars move in a straight line with the following equations of motion: x1 = -4.0 m + (1.1 m/s )t x2 = 8.8 m + (-2.9 m/s
    12·1 answer
  • What type of medium (solids, liquids, or gases) do sound waves travel fastest in?
    9·1 answer
  • Buoyant force acts in the opposite direction as the force of
    14·1 answer
  • If a critical mass of fissionable material in a spherical shape is flattened like a hamburger, it will be?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!