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
gladu [14]
3 years ago
14

At the same moment from the top of a building 3.0 × 10 2 m tall, one rock is dropped and one is thrown downward with an initial

velocity of 26 m/s. both of them experience negligible air resistance. how much earlier does the thrown rock strike the ground?
Physics
2 answers:
Bess [88]3 years ago
5 0
The equation that relates distance, velocities, acceleration, and time is,
                   d = V₀t + 0.5gt²
where d is distance,
V₀ is the initial velocity,
t is time, and 
g is the acceleration due to gravity (equal to 9.8 m/s²)

(1) Dropped rock,
                  (3 x 10² m ) = 0(t) + 0.5(9.8 m/s²)(t²)
The value of t from this equation is 24.73 s

(2) Thrown rock with V₀ = 26 m/s
                (3 x 10² m) = (26)(t) + 0.5(9.8 m/s²)(t²)
The value of t from the equation is 5.61 s

The difference between the tim,
        difference = 24.73 s - 5.61 s
          difference = 19.12 s

<em>ANSWER: 19.12 s</em>
erik [133]3 years ago
3 0

Answer:

t = 5.607 sec

Explanation:

s = ut + (1/2)at²

you can figure out the time that the dropped ball to hit the ground quite easily because u = 0 m/s, therefore

s = (1/2)at²

t² =2s/a

t = sqrt(2s/a)

assuming the acceleration from gravity is 9.81 m/s²

t = sqrt(2*300m/9.81 m/s²)

t = 7.8 s

You can use the quadratic equation to find t for the thrown rock and then subtract them.  Or you can calculate the final velocity of the thrown rock with v^2 = u^2 + 2as and then use v = u + at to find the time for the thrown rock.

v² = (26 m/s)² + 2 * (9.81 m/s^2 * 300 m)

v² =6562

v = 81 m/s

v = u + at

t = (v - u)/s

t = (81 m/s - 26 m/s)/9.81 m/s^2

t = 5.607 sec

You might be interested in
The force that pulls planets torwards the sun is called​
Studentka2010 [4]

Answer:

gravity

Explanation:

Gravity pulls the planets toward the Sun. Gravity pulls the moon toward Earth. Gravity pulls us toward the Earth. Gravity is a force. Inertia.

7 0
3 years ago
Which of the following statements is true?
Mandarinka [93]
Hi there!
Your answer would be
A and C.
Hope this helped, please give brainliest!

5 0
3 years ago
Read 2 more answers
41. 2072 Set E Q.No. 11 A source of sound produces a note of
Nimfa-mama [501]
A. is the answer for this
4 0
2 years ago
What is the acceleration during the pushing-off phase, in m/27 Express your answer in meters per second squared. A bush baby, an
Sindrei [870]

Answer:

a = 12.78 g's

Explanation:

Height reached by the object after push off is given as

H = 2.3 m

v_f^2 - v_i^2 = 2 a s

now we have

0 - v^2 = 2(-9.81)(2.3)

v = 6.72 m/s

now we know that this push last for total distance of 0.18 m

so during the push we will have

v_f^2 - v_i^2 = 2 a d

6.72^2 - 0 = 2a(0.18)

a = 125.35 m/s^2

now in terms of g = 9.81 m/s/s we have

a = \frac{125.35}{9.81} gs

a = 12.78 g's

6 0
2 years ago
Describe how ultrasound and infrasound are used in specific industrial applications and provide detailed examples.
Angelina_Jolie [31]
In scientific terms, ultrasound is a sound pressure, cyclic in nature, that has a greater frequency than the limit at the top of human hearing capabilities. What this means is that an ultrasonic sound can’t be heard by the human ear because their frequency is too high for our ears to pick up. In healthy young adults, this upper hearing capability is an average of 20 kilohertz. Ultrasound has many applications in several fields. Perhaps the best known application for ultrasound is sonography. This is where medical staff use the high pitched noise to produce a picture of a fetus while in the mother’s womb. Another use however, doesn’t directly concern humans at all. Bats use the high pitched noises to see in the dark and get an accurate reading on their preys internal structure. A popular belief is that an ultrasonic sound has the ability to turn the locking mechanism in a door lock, as demonstrated on some spy movies. On the opposite side of this are infrasonic sounds. These are noises with a frequency less than the lowest level of human hearing capabilities is 20 hertz. It is possible for humans to perceive infrasonic sounds, but only if the air pressure is sufficient. Although the war is the main tool for hearing these low sounds, it is possible for other parts of the body to “feel them”. Infrasound can be used to send signals in the army to special machines that can pick them up. These can be used to transmit vital data. Animals are able to pick up some low infrasonic noises which warn them of natural disasters before they happen, generally earthquakes and tsunamis.


I hope some of this information I gave you can help you. I came up with everything myself to help you.
4 0
3 years ago
Other questions:
  • 0.45 kg soccer ball changes its velocity by 20.0 m/s due to a force applied to it in 0.10 seconds. What force was necessary for
    12·1 answer
  • An asteroid orbiting the Sun has a mass of 4.00×1016 kg. At a particular instant, it experiences a gravitational force of 3.14×1
    11·1 answer
  • Electromagnetic force is present when electromagnetic fields
    6·2 answers
  • If a mass of .343 kg moves down a 5m ramp in 5.8 seconds, what is the velocity and KE developed by the moving mass
    5·1 answer
  • The substance that a wave moves through is called a __________.
    6·2 answers
  • Which statements describe the sun? Check all that apply
    8·2 answers
  • Light travels through water at 2.2506 x 108 m/s. A person shines a light at a friend that is underwater. If the ray in the water
    10·2 answers
  • How are electromagnetic waves able to travel without a medium?
    15·1 answer
  • Jennifer and Jamie have a class assignment to identify an example of climate change and an example of a change in weather. They
    10·1 answer
  • It takes a 7N force to cause a 0.028 kg object to begin moving. What is the acceleration of the object as it begins to move?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!