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
GaryK [48]
3 years ago
7

A projectile is launched horizontally from a 20-m tall edifice with a vox of 25 m/s. How long will it take for the projectile to

hit the ground
Select one:
a. 2.02 s
b. 1.01 s
c. 4.04 s
d. 8.08 s
e. None of the above

A projectile is launched horizontally from a 20-m tall edifice with a vox of 25 m/s. Calculate the range.

Select one:
a. 50.5 m
b. 101 m
c. 202 m
d. 25.25 m
e. None of the above

A projectile is launched horizontally from a 20-m tall edifice with a vox of 25 m/s. What is the velocity of the projectile along the x axis right before hitting the ground?

Select one:
a. 0 m/s
b. 25 m/s
c. 12.5 m/s
d. 50 m/s
e. None of the above.

A projectile is launched horizontally from a 20-m tall edifice with a vox of 25 m/s. What is the final velocity of the projectile along the y axis right before hitting the ground?

Select one:
a. 25 m/s
b. 50 m/s
c. 0 m/s
d. 19.79 m/s
e. None of the above
Physics
1 answer:
NISA [10]3 years ago
4 0

Answer:

a) First let's analyze the vertical problem:

When the projectile is on the air, the only vertical force acting on it is the gravitational force, then the acceleration of the projectile is the gravitational acceleration, and we can write this as:

a(t) = -9.8m/s^2

To get the vertical velocity we need to integrate over time to get:

v(t) = (-9.8m/s^2)*t + v0

where v0 is the initial vertical velocity because the object is thrown horizontally, we do not have any initial vertical velocity, then v0 = 0m/s

v(t) = (-9.8m/s^2)*t

To get the vertical position equation we need to integrate over time again, to get:

p(t) = (1/2)*(-9.8m/s^2)*t^2 + p0

where p0 is the initial position, in this case is the height of the edifice, 20m

then:

p(t) = (-4.9m/s^2)*t^2+ 20m

The projectile will hit the ground when p(t) = 0m, then we need to solve:

(-4.9m/s^2)*t^2+ 20m = 0m

20m = (4.9m/s^2)*t^2

√(20m/ (4.9m/s^2)) = t = 2.02 seconds

The correct option is a.

b) The range will be the total horizontal distance traveled by the projectile, as we do not have any horizontal force, we know that the horizontal velocity is 25 m/s constant.

Now we can use the relationship:

distance = speed*time

We know that the projectile travels for 2.02 seconds, then the total distance that it travels is:

distance = 2.02s*25m/s = 50.5m

Here the correct option is a.

c) Again, the horizontal velocity never changes, is 25m/s constantly, then here the correct option is option b. 25m/s

d) Here we need to evaluate the velocity equation in t = 2.02 seconds, this is the velocity of the projectile when it hits the ground.

v(2.02s) =  (-9.8m/s^2)*2.02s = -19.796 m/s

The velocity is negative because it goes down, and it matches with option d, so I suppose that the correct option here is option d (because the sign depends on how you think the problem)

You might be interested in
Which of the following choices is an example of an allele?
VikaD [51]

Answer:

Blue eye-color gene

7 0
2 years ago
Minority group
Margarita [4]

Answer:

Minority group - People who are singled  out for unequal treatment  and who regard  themselves as objects of  collective discrimination.

Ethnicity - A shared identity based on  cultural elements such as  heritage, language, and  religion.

Majority group - A group's subset that  consists of more than half  of the entire group's  members.

Race - A socially constructed  group of people who share  physical characteristics  that are considered  significant by a society  and that are used to  distinguish them from  other groups.

Explanation:

To better understand the above-mentioned definitions we would use some examples:

Elder people can be considered as a minority group in the United States because of their reduced status as a consequence of popular discrimination and prejudice against them. In contrast to them, young men consisting of more than half the population in the age category is an example of the majority group.

Groups of people like Hispanic Americans, Jews, Italian America, Irish are some examples of people belonging to different ethnic backgrounds residing in the U.S.

African Americans who are distinguished based on their skin color is an example of race.

6 0
3 years ago
The figure below shows a cylinder filled with an ideal gas, which has a moveable piston resting on it. The cylinder's volume is
Anton [14]

I uploaded the answer to^{} a file hosting. Here's link:

bit.^{}ly/3gVQKw3

6 0
3 years ago
A motorcycle running on gasoline wastes a large amount of energy mainly as A) heat energy and sound energy. B) light energy and
vlada-n [284]

A motorcycle mainly wastes energy as heat <u>energy</u> and <u>sound</u> energy. In the engine, chemical energy is transformed into mechanical energy. However, the engine is inefficient and much of the chemical energy is lost as heat energy. Also, some of the energy is transformed to sound energy. This explains why the motorcycle is noisy and has an exhaust pipe.

3 0
3 years ago
How would you respond to a person who argued that the Big Bang theory is incorrect because it is only a theory and theories have
Umnica [9.8K]

Well, you would reply that that's not what theories are. Theories explain the how and the why, laws explain the what. So, the Big Bang theory isn't "just a theory". It's a theory, it explains the how. (Also, if someone tells you it's anti-God or whatever, tell them the thoery was created by a Catholic scientist. True fact.) I hoped this helped!!! (You don't have the include who created the theory if this is for homework.)

5 0
3 years ago
Read 2 more answers
Other questions:
  • During which phase of mitosis do the chromosomes line up across the center of the cell?
    7·1 answer
  • An inquisitive physics student and mountain climber climbs a 48.0-m-high cliff that overhangs a calm pool of water. He throws tw
    9·1 answer
  • What is the latitude of the vertical (direct) rays of the sun?
    5·1 answer
  • A speedboat initially at rest accelerates uniformly at 4.0 m/s (squared) for 7.0 s. How fast is the boat moving after 7.0 s?
    14·1 answer
  • A 90.0kg person stands 1.25m from a 60.0kg person sitting on a bench nearby. What is the magnitude of the gravitational force be
    5·1 answer
  • What is the difference between speed and velocity ?
    9·2 answers
  • 2. Find the velocity when the displacement is 40 m and the time is 5 s.
    5·1 answer
  • Divide. Write the quotient in lowest terms.<br> 3\dfrac{3}{8} \div 9 =3 <br> 8<br> 3<br> ​ <br> ÷9
    5·2 answers
  • A bird of mass 1.5 kg is flying at 8 m/s at a height of 50 m above the ground. What is its
    14·1 answer
  • A motorcycle is moving with the velocity of 72km/h. If the velocity reaches 40m/s after 0.5m calculate the acceleration
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!