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777dan777 [17]
3 years ago
12

A ball is thrown horizontally from the top of

Physics
1 answer:
nordsb [41]3 years ago
7 0

Answer:

54.0 m/s

Explanation:

We can start by calculating the time it takes for the ball to reach the ground. This can be done by using the equation for the vertical position of the ball at time t:

y(t) = h + u_y t - \frac{1}{2}gt^2

where

h = 140 m is the initial height

u_y =0 is the initial vertical velocity (the ball is thrown horizontally)

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

When the ball reaches the ground, y=0, so we solve for t to find the time of flight:

0=h-\frac{1}{2}gt^2\\t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2(140)}{9.8}}=5.35 s

We can find the vertical speed of the ball at the moment of the impact by using

v_y=u_y+gt

Using t = 5.35 s,

v_y=0+(9.8)(5.35)=52.4 m/s

The motion of the ball along the horizontal direction is a uniform motion - so the horizontal velocity is constant during the whole motion, and it is given by

v_x = \frac{d}{t}

where

d = 69 m

is the distance travelled horizontally. Using t = 5.35 s,

v_x = \frac{69}{5.35}=12.9 m/s

And therefore, the speed of the ball at the moment of the impact is given by

v=\sqrt{v_x^2+v_y^2}=\sqrt{(12.9)^2+(52.4)^2}=54.0 m/s

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Light in air enter crown glass (n = 1.52) at an angle of 35 degrees. What is the refracted angle?
Dovator [93]

Answer:

22.17 degree

Explanation:

n = 1.52

Angle of incidence, i = 35 degree

Let the angle of refraction is r.

use the Snell's law

n = Sin i / Sin r

Sin r = Sin i / n = Sin 35 / 1 .52

Sin r = 0.37735

r = 22.17 degree

Thus, the ray is refracted at an angle of 22.17 degree.

8 0
3 years ago
A curved road has a radius of 120 m and a cant angle of 48 degrees. What is the maximum speed to stay on the curve in the absenc
zalisa [80]

Answer:

Maximum speed, v = 36 m/s                                                          

Explanation:

Given that,

The radius of the curved road, r = 120 m

Road is at an angle of 48 degrees. We need to find the maximum speed of stay on the curve in the absence of friction. On a banked curve, the angle at which it is cant is given by :

tan\theta=\dfrac{v^2}{rg}

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v=\sqrt{rg\ tan\theta}

v=\sqrt{120\times 9.8\times \ tan(48)}

v = 36.13 m/s

or

v = 36 m/s

So, the maximum speed to stay on the curve in the absence of friction is 36 m/s. Hence, this is the required solution.

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3 years ago
A downhill skier reaches the steepest part of a trail. Her speed increases from 9 m/s to 18 m/s in 3 seconds. What is her averag
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Answer:

3m/s²

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what is a state of well being that is achieved through a combination of good die regular phisical exercises and other partices t
snow_lady [41]

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<h3>What is a state of physical well-being?</h3>

The ability to maintain a healthy quality of life that allows us to get the most out of our everyday activities without undue weariness or physical stress is referred to as physical wellness. It entails taking care of our bodies and acknowledging that our everyday routines and behaviours have a substantial impact on our general health, well-being, and quality of life.

This section contains further information about:

keeping that body moving - benefits of regular mobility in your work or study periods

finding your 30 - recommendations for regular exercise while isolated eating well getting a good night's sleep maintaining routine health check-ups

learn more about physical well-being refer:

brainly.com/question/12712584

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