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Arlecino [84]
3 years ago
5

You kick a soccer ball with a speed of 18 m/s at an angle of 43. How long does it take the the ball to reach the top of its traj

ectory
Physics
1 answer:
harkovskaia [24]3 years ago
4 0

The ball reaches the top of its trajectory after 1.25 s

Explanation:

The motion of the ball is a projectile motion, which consists of two independent motions:  

- A uniform motion (at constant velocity) along the horizontal direction  

- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction

To solve the problem we are only interested in the vertical motion of the ball. The vertical velocity of the ball at time t is given by

v_y = u_y -gt

where

u_y is the initial vertical velocity

g=9.8 m/s^2 is the acceleration of gravity

t is the time

The ball reaches its maximum heigth when its vertical velocity is zero:

v_y = 0

Also, the initial vertical velocity is given by

u_y = u sin \theta

where

u = 18 m/s is the initial speed

\theta=43^{\circ} is the angle of projection

Solving the equation for t, we find the time at which the ball reaches the maximum height:

0=u sin \theta -gt\\t=\frac{u sin \theta}{g}=\frac{(18)(sin 43^{\circ})}{9.8}=1.25 s

 

Learn more about projectile motion:

brainly.com/question/8751410

#LearnwithBrainly

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erik [133]

Answer:

E_total = 1.30 10¹⁰ C / m²

Explanation:

The intensity of the electric field is

     E = k q / r²

on a positive charge proof

The total electric field at the midpoint is

as q₁= 6 10⁻⁶ C the field is outgoing to the right

for charge q₂ = -3 10⁻⁶ C, the field is directed to the right, therefore

E_total = E₁ + E₂

E_total = k q₁ / r₁² + k q₂ / r₂²

r₁ = r₂ = r = 4 10⁻² m

E_total = k/r² (q₁ + q₂)

 we calculate

E_total = 9 10⁹ / (4 10⁻²)²   (6.0 10⁻⁶ +3.0 10⁻⁶)

E_total = 1.30 10¹⁰ C / m²

8 0
3 years ago
An electron is ejected from the cathode by a photon with an energy slightly greater than the work function of the cathode. How w
Ksivusya [100]

It will be approximately equal.

<h3>How will the final kinetic energy change?</h3>

We can infer that all of the energy in the electron is Potential energy (PE) because the energy provided by the photon is hardly enough to outweigh the work function.

It will gain kinetic energy (KE) as it advances in the direction of the anode because it is moving through an electric field. All of the PE will have been transformed to KE by the time it reaches the anode.

According to the question

K = hf - W

W = Work function

The energy of photons is comparable. After conversion, there was only a little amount of KE remaining.

Therefore, PE (W) essentially equals KE (K).

It will about be equal.

Learn more about work function here:

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3 0
2 years ago
A truck travels 1430 m uphill along a road that makes a constant angle of 5.76◦ with the horizontal.
Alex73 [517]

Answer:

The horizontal component of displacement is d' = 1422.7 m

Explanation:

Given data,

The distance covered by the truck, d = 1430 m

The angle formed with the horizontal, Ф = 5.76°

The displacement is a vector quantity.

The horizontal component of displacement is given by,

                                 d' = d cos Ф

                                     = 1430 cos 5.76°

                                     = 1422.7 m

Hence, the horizontal component of displacement is d' = 1422.7 m

5 0
3 years ago
You wrap a wire around a piece of iron. If you slowly increase the strength of an electric current flowing through the wire, you
Maksim231197 [3]
The correct answer is A. the magnet to become stronger

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4 0
3 years ago
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What form of matter is "vapor"?
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Vapor is usually made with water and it would be made with gas. 
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