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Julli [10]
3 years ago
6

A ball is thrown horizontally from a cliff and hits the ground 4 seconds later 40 meters from the base of the cliff. How high wa

s the cliff (rounded to the nearest tenth of a meter)?
Physics
2 answers:
DochEvi [55]3 years ago
8 0
<span>A ball is thrown horizontally from a cliff at a speed of 15 m/s and strikes the ground 45 meters from the base of the cliff. How high was the cliff (rounded to the nearest meter)</span>
sashaice [31]3 years ago
7 0

Answer:

h= 78.4 m

Explanation:

The ball moves with a uniformly accelerated movement in the vertical direction (y), we apply the following formulas:

vfy= v₀y+g*t Formula (1)

vfy²=v₀y²+2*g*h Formula (2)

h: hight in meters (m)    

t : time in seconds (s)

v₀y: initial speed in y  (m/s)  

vfy: final speed in y ( m/s   )

g: accelerationdue to gravity  (m/s² )

Known Data

v₀y= 0

t= 4 s

g= 9,8 m/s²

We apply the formula (1) to calculate vfy

vfy= v₀y+g*t

vfy= 0+ (9,8)*(4)

vfy= 39.2 m/s

We apply the formula (2) to calculate h

vfy²=v₀y²+2*g*h

(39.2)²=0+2*9.8*h

h = (39.2)²  /  (2*9.8)

h= 78.4 m

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Is a process that modifies light waves so they vibrate in a single plane
madam [21]

The process you're fishing for is "polarization", but that's a

misleading description.

Polarization doesn't do anything to change the light waves. 

It simply filters out (absorbs, as with a polarizing filter) the

light waves that aren't vibrating in the desired plane, and

allows only those that are to pass.

The intensity of a light beam is always reduced after

polarizing it, because much (most) of the original light

has been removed.

A laser light source may be thought of as an exception,

since everything coming out of the laser is polarized.

8 0
4 years ago
A string is wrapped several times around the rim of a small hoop with radius 8.00 cm and mass 0.180 kg. The free end of the stri
Dmitrij [34]

Answer:

(a). The angular speed of the rotating is 33.8 rad/s.

(b). The speed of its center is 2.7 m/s.

Explanation:

Given that,

Radius = 8.00 cm

Mass = 0.180 kg

Height = 75.0 m

We need to calculate the angular speed of the rotating

Using conservation of energy

\dfrac{1}{2}I\omega_{1}^2+\dfrac{1}{2}mv_{1}^{2}+mgh_{1}=\dfrac{1}{2}I\omega_{2}^2+\dfrac{1}{2}mv_{2}^{2}+mgh_{2}

Here, initial velocity and angular velocity are equal to zero.

mgh_{1}=\dfrac{1}{2}I\omega_{2}^2+\dfrac{1}{2}mv_{2}^{2}+mgh_{2}

mg(h_{1}-h_{2})=\dfrac{1}{2}I\omega_{2}^2+\dfrac{1}{2}mv_{2}^{2}

mgH=\dfrac{1}{2}mr^2\omega_{2}^2+\dfrac{1}{2}m(r\omega_{2})^2

Here, H = h_{1}-h_{2}

gH=r^2\omega_{2}^2

\omega_{2}^2=\dfrac{gH}{r^2}

\omega_{2}=\sqrt{\dfrac{9.8\times75.0\times10^{-2}}{(8.00\times10^{-2})^2}}

\omega_{2}=33.8\ rad/s

The angular speed of the rotating is 33.8 rad/s.

(b). We need to calculate the speed of its center

Using formula of speed

v=r\omega

Put the value into the formula

v=8.00\times10^{-2}\times33.8

v=2.7\ m/s

Hence, (a). The angular speed of the rotating is 33.8 rad/s.

(b). The speed of its center is 2.7 m/s.

3 0
3 years ago
Read 2 more answers
While a block slides forward 1.35 m, a force pulls back at a 135 direction, doing -17.8 J of work. what is the magnitude of the
Verdich [7]

The magnitude of the force is 18.6 N

Explanation:

The work done by a force on an object is given by

W=Fd cos \theta

where

F is the magnitude of the force

d is the displacement of the object

\theta is the angle between the direction of the force and of the displacement

For the block in this problem, we have

W=-17.8 J is the work done

d = 1.35 m is the displacement of the block

\theta=135^{\circ} is the angle between the force and the displacement

Solving for F, we find the magnitude of the force:

F=\frac{W}{d cos \theta}=\frac{-17.8}{(1.35)(cos 135)}=18.6 N

Learn more about work here:

brainly.com/question/6763771

brainly.com/question/6443626

#LearnwithBrainly

8 0
4 years ago
Which of the following is a true statement? A. Electromagnetic waves consist of only changing electric fields. B. Electromagneti
just olya [345]
C. Electromagnetic waves don't always need a medium to travel. Note that they do vary in wavelength and frequency however their speed is fixed. Also, EM waves are always transverse and they consist of vibrating electric and magnetic fields.
7 0
4 years ago
Read 2 more answers
HELP!!! I have no idea how to calculate this.
stiks02 [169]

\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}

Actually Welcome to the Concept of the kinematics of a body.

Since, we know that Velocity = Distance / time

hence, V = 20/5 = 4 m/s

hence the velocity of the RC car is 4 m/s westwards direction.

4 0
3 years ago
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