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
vlada-n [284]
2 years ago
15

Demarcus launches a small weight into the air. The weight takes 6.4 seconds to reach the ground again. At what time did the weig

ht have a vertical velocity of 0 meters per second?

Physics
1 answer:
Monica [59]2 years ago
5 0
The answer is A.
During the process, the only force imposed on the small weight is gravity.
The time from launching to the highest is the same as the time from the highest to the ground. And the vertical velocity at 0 m/s is at the highest position.
You might be interested in
Water (density = 1 ´ 103 kg/m3) flows at 10 m/s through a pipe with radius 0.030 m. the pipe goes up to the second floor of the
Hatshy [7]

density of water = 1000 kg/m^3

velocity of flow = 10 m/s

radius of pipe = 0.030 m

Height of second floor = 2 m

Now we can use here Bernuoli's Equation to find the speed of water flow at second floor

P_1 + 1/2\rho v_1^2 + \rho g h_1= P_2 + 1/2 \rho v_2^2 + \rho g h_2

P + 1/2 * 1000 * 10^2 + 1000* 9.8 * 0 = P + 1/2 * 1000 * v^2 + 1000*9.8*2

v = 7.8 m/s

Now in order to find the radius of pipe we can use equation of continuity

A_1 v_1 = A_2 v_2

\pi *0.030^2 * 10 = \pi * r^2 * 7.8

r = 0.034 m

So radius of pipe at second floor is 0.034 meter

3 0
3 years ago
Please help me i dont understand it <br><br><br><br> This subject is Earth science
Anton [14]
Here are your answers

6 0
3 years ago
The image above was taken by the spacecraft Messenger as it flew by the planet Mercury. The terrain shown in this image is typic
lorasvet [3.4K]
The answer is

C


Hope this helps
7 0
3 years ago
Which sequence shows the chain of energy transfers that create surface currents on the ocean?
Papessa [141]

Answer:

The correct answer is A. The sun is the energy source of the surface currents in the ocean

6 0
2 years ago
Explain what it means when we say a substance is magnetic
MariettaO [177]
A magnetic field is a force field, invisibly pushing electrically charged objects just as a gravitational field pulls objects with mass. Whereas all objects with mass exert a gravitational field, however, not all objects have a magnetic field. Magnetic fields are created by electrical charges. Thanks to their structure at the atomic level, some substances -- like the iron in magnets -- have a permanent magnetic field.
5 0
3 years ago
Other questions:
  • Rank the six combinations of electric charges on the basis of the electric force acting on q1. Define forces pointing to the rig
    7·1 answer
  • What is the strongest interparticle force is each substance ch3cl?
    13·1 answer
  • What rule should be used to transform a table of data to represent the
    13·1 answer
  • In a ballistics test, a 28-g bullet pierces a sand bag that is 30cm thick. If the initial bullet velocity was 55 m/s and it emer
    14·1 answer
  • A jogger runs at a constant rate of 10.0 m every 2.0 seconds. The jogger starts at the origin and runs in the positive direction
    14·1 answer
  • A 60 kilogram student jumps down from a laboratory counter. At the instant he lands on the floor hus speed is 3 meters per secon
    14·1 answer
  • Questions are in the picture ^ (please answer separately)
    13·2 answers
  • Which technological advancement made the Pony Express unnecessary?
    9·2 answers
  • What benefits does preforming this investigation in the physical world have over the computer simulation?
    11·1 answer
  • Please help <br> Physics is so confusing
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!