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
nignag [31]
2 years ago
11

A man is standing on the edge of a 20.0 m high cliff. He throws a rock horizontally with an initial velocity of 10.0 m/s.

Physics
1 answer:
Darina [25.2K]2 years ago
7 0

Answer:

<em>a. t = 2.02 s </em>

<em>b. d = 20.2 m</em>

Explanation:

<u>Horizontal Motion </u>

If an object is thrown horizontally from a height h with a speed v, it describes a curved path ruled exclusively by gravity until it eventually hits the ground.

The time the object takes to hit the ground can be calculated as follows:

\displaystyle t=\sqrt{\frac{2h}{g}}

The time does not depend on the initial speed.

The range or maximum horizontal distance traveled by the object can be calculated by the equation:

\displaystyle d=v.t

The man standing on the edge of the h=20 m cliff throws a rock with an initial horizontal speed of v=10 m/s.

a.

The time taken by the rock to reach the ground is:

\displaystyle t=\sqrt{\frac{2*20}{9.8}}

\displaystyle t=\sqrt{4.0816}

t = 2.02 s

b.

The range is:

\displaystyle d=10\cdot 2.02

d = 20.2 m

You might be interested in
Along some shorelines, incoming waves cause the water to simply rise and fall rather that form a surf zone. What does this tell
NARA [144]

Answer:

Explained

Explanation:

Along some shorelines, incoming waves cause the water to simply rise and fall and not form surfs because of the steepness of the shorelines. Long period waves wont form surfs at steep shores because of the breaking and unstability of waves. Wave breaks at the shallow waters. The breaking of the waves depends upon H/L ratio.

5 0
2 years ago
Coherent light of wavelength 525 nm passes through two thin slits that are 4.15×10^(−2) mm apart and then falls on a screen 7
IRINA_888 [86]

A) 4.7 cm

The formula for the angular spread of the nth-maximum from the central bright fringe for a diffraction from two slits is

sin \theta=\frac{n \lambda}{d}

where

n is the order of the maximum

\lambda is the wavelength

a is the distance between the slits

In this problem,

n = 5

\lambda=525 nm =5.25\cdot 10^{-7} m

a=4.15\cdot 10^{-2} mm=4.15\cdot 10^{-5} m

So we find

\theta=sin^{-1} (\frac{(5)(5.25\cdot 10^{-7} m)}{4.15\cdot 10^{-5} m})=3.62^{\circ}

And given the distance of the screen from the slits,

D=75.0 cm = 0.75 m

The distance of the 5th  bright fringe from the central bright fringe will be given by

y=D tan \theta = (0.75 m)tan 3.62^{\circ}=0.047 m = 4.7 cm

B) 8.1 cm

The formula to find the nth-minimum (dark fringe) in a diffraction pattern from double slit is a bit differente from the previous one:

sin \theta=\frac{(n+\frac{1}{2}) \lambda}{d}

To find the angle corresponding to the 8th dark fringe, we substitute n=8:

\theta=sin^{-1} (\frac{(8+\frac{1}{2})(5.25\cdot 10^{-7} m)}{4.15\cdot 10^{-5} m})=6.17^{\circ}

And the distance of the 8th dark fringe from the central bright fringe will be given by

y=D tan \theta = (0.75 m)tan 6.17^{\circ}=0.081 m = 8.1 cm

5 0
3 years ago
What is the power of a refrigerator with voltage 110 V and<br> current 0.8 A?
tia_tia [17]

Answer: 88

Explanation:

8 0
3 years ago
2. What kinds of statistics are used in sports? In a paragraph explain your answer with examples
Lostsunrise [7]

Answer: Sports Illustrated noted that analytics in a sport such as a football is widely used to manage injury prevention. Basketball coaches make use of statistics such as field-goal attempts, effective field goal percentage, free throw attempts, and free throw percentages.

Explanation: BRAINLEST?

4 0
2 years ago
What is happening in this picture?
Alexandra [31]
The answer is b no problem
7 0
3 years ago
Read 2 more answers
Other questions:
  • Assume each tick mark represents 1 cm. Calculate the total displacement from 0 if an object moves 3 cm to the left, then 7 cm to
    5·2 answers
  • In order for work to be done, what must be true?
    9·1 answer
  • A coach wants her team to have fun, win some games, and be a productive unit. What is the most important personality trait the c
    8·2 answers
  • Find the net rate of heat transfer by radiation in watts from a skier standing in the shade, given the following. She is complet
    9·1 answer
  • Two 3.0 mm × 3.0 mm electrodes are held 0.10 mm apart and are attached to 9.0 V battery. Without disconnecting the battery, a 0.
    10·1 answer
  • Present at least one example that illustrates acceleration. Is this a scalar or vector quantity? Explain why. ...?
    7·2 answers
  • Read the following story and tell me how Harper used the FITT principle. Harper works out 4-5 days a week for 60 minutes a day.
    11·1 answer
  • 1When you look through a magnifying glass, the objects you are looking at
    14·1 answer
  • HELP ME PLEASEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
    11·2 answers
  • A ball is thrown up into the air with 100 j of kinetic energy, which is transformed to gravitational potential energy at the top
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!