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
Ludmilka [50]
3 years ago
12

You throw an 18.0 N rock into the air from ground level and observe that, when it is 15.0 m high, it is traveling upward at 17.0

m/s. Part A Use the work-energy principle to find the rock's speed just as it left the ground. Express your answer in meters per second. vground
Physics
1 answer:
stellarik [79]3 years ago
4 0

Answer:

Vi = 24.14 m/s

Explanation:

If we apply Law of Conservation of Energy or Work-Energy Principle here, we get: (neglecting friction)

Loss in K.E of the Rock = Gain in P.E of the Rock

(1/2)(m)(Vi² - Vf²) = mgh

Vi² - Vf² = 2gh

Vi² = Vf² + 2gh

Vi = √(Vf² + 2gh)

where,

Vi = Rock's Speed as it left the ground = ?

Vf = Final Speed = 17 m/s

g = 9.8 m/s²

h = height of rock = 15 m

Therefore,

Vi = √[(17 m/s)² + 2(9.8 m/s²)(15 m)]

Vi = √583 m²/s²

<u>Vi = 24.14 m/s</u>

You might be interested in
A kangaroo can jump straight up to a height of 2.0 m. What is its takeoff speed
12345 [234]
7.17m/s glad I could help
5 0
3 years ago
I need help for a assignment NOT A QUIZ
Debora [2.8K]

Answer:

what

ITS BLANK FOR ME I WISH I COULD HELP YOU

3 0
3 years ago
Read 2 more answers
How do you determine the wattage capacity needed by a power supply?
Lady bird [3.3K]
We could use the formula for the Power supply in order to find the wattage capacity and it would be:

P = V²/R or P = V * I

Hope this helps!
6 0
3 years ago
~~~!Here's the question!~~~
gtnhenbr [62]
The answer would most likely be A since obviously gravity weighs things down which helps the every other masses stay settled in place
6 0
3 years ago
Read 2 more answers
What is the wavelength of violet light that has a frequency of 7.5x10^14
Crank
Λ= V/f 
<span>but change it to represent the speed of light, c </span>
<span>λ= c/f </span>
<span>c = 3.00 x 10^8 m/s </span>
<span>Plug in your given info and solve for λ(wavelength) </span>
<span>λ= 3.00 x 10^8 m/s / 7.5 x 10^14 Hz
(3.00 x 10^8) / (7.5 x 10^14) = 300,000,000 / 750,000,000,000,000 = 0.0000004
Hope this helps :)
</span>
6 0
3 years ago
Read 2 more answers
Other questions:
  • 1. Discuss some of the dangers and obstacles that Nyad faced when sw
    14·1 answer
  • ¿A qué clase social pertenecen?
    6·1 answer
  • A 70 kg human sprinter can accelerate from rest to 10 m/s in 3.0 s. During the same time interval, a 30 kg greyhound can go from
    15·1 answer
  • Two equal mass carts approach each other with velocities equal in magnitude but opposite in direction. Friction can be neglected
    15·1 answer
  • A positive charge of 6.0 × 10-4 C is in an electric field that exerts a force of 4.5 × 10-4 N on it. What is the strength of the
    9·2 answers
  • g How many diffraction maxima are contained in a region of the Fraunhofer single-slit pattern, subtending an angle of 2.12°, for
    13·1 answer
  • Flasher units are being discussed. Technician A says that only a DOT-approved flasher unit should be used for turn signals. Tech
    13·1 answer
  • The net force of two forces F1 and F2 acting in the same direction is 85N.And if is 15N when they are exerted in opposite direct
    12·2 answers
  • A body of mass 11 kg is subjected to a net force of 20 N East for 30 s. Calculate the change in
    10·1 answer
  • Which of the following is not an SI unit. A. pound B. Newton C. Meter D. kilogram
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!