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
Sloan [31]
3 years ago
11

A batter hits a pop-up straight up over home plate at an initial velocity of 21 m/s. the ball is caught by the catcher at the sa

me height that it was hit. at what velocity does the ball land in the catcher's mitt? neglect air resistance. (take the positive direction to be upwards.)
Physics
2 answers:
Tamiku [17]3 years ago
8 0
<span>The ball rises, converting the initial Kinetic Energy (KE) into Potential Energy (PE), until it comes to rest at a given height, at which point all of the KE has been converted to PE. At that point, it begins to accelerate back downward, until it reaches the catcher's mitt, at the same KE with which it was initially hit. So overall no change in energy as there is no difference in height so the speed should be same but as positive direction is taken to be upwards and ball is now going down the speed will be -21m/s</span>
pishuonlain [190]3 years ago
4 0

Our intial velocity is -21 m/s

 

The computation for this problem would be:

vf² = vi² + 2ad 

vf = +/- sqrt[vi² + 2ad] 

since d = 0, 

vf = +/- sqrt[vi²] 

vf = +/- vi 

vf = -vi, from the time when the final velocity must be in the opposite direction of the initial velocity, the answer would be:

vf = - 21 m/s

You might be interested in
What is the mass of an object that creates 33750 J of energy by traveling at 30 m/s
OleMash [197]
Answer: Mass of the object is  75 kg.
4 0
3 years ago
Read 2 more answers
The birth defect caused by the Zika Virus to unborn infants is called__________?
lions [1.4K]
It is B, Microcephaly. Hope I helped! :))
3 0
3 years ago
You will now examine the relationship between the number of field lines through a surface and the tangle betwcen A and E) angle
nikitadnepr [17]

Answer:

a. cosθ b. E.A

Explanation:

a.The electric flux, Φ passing through a given area is directly proportional to the number of electric field , E, the area it passes through A and the cosine of the angle between E and A. So, if we have a surface, S of surface area A and an area vector dA normal to the surface S and electric field lines of field strength E passing through it, the component of the electric field in the direction of the area vector produces the electric flux through the area. If θ the angle between the electric field E and the area vector dA is zero ,that is θ = 0, the flux through the area is maximum. If  θ = 90 (perpendicular) the flux is zero. If θ = 180 the flux is negative. Also, as A or E increase or decrease, the electric flux increases or decreases respectively. From our trigonometric functions, we know that 0 ≤ cos θ ≤ 1 for  90 ≤ θ ≤ 0 and -1 ≤ cos θ ≤ 0 for 180 ≤ θ ≤ 90. Since these satisfy the limiting conditions for the values of our electric flux, then cos θ is the required trigonometric function. In the attachment, there is a graph which shows the relationship between electric flux and the angle between the electric field lines and the area. It is a cosine function  

b. From above, we have established that our electric flux, Ф = EAcosθ. Since this is the expression for the dot product of two vectors E and A where E is the number of electric field lines passing through the surface and A is the area of the surface and θ the angle between them, we write the electric flux as Ф = E.A  

4 0
3 years ago
Does uniform acceleration means increasing acceleration?
tatiyna
Yes. It means that the acceleration increases at a constant rate, for example 3 mph every second.
5 0
3 years ago
To maintain your body temperature your body converts chemical potential energy into thermal energy true or false
max2010maxim [7]
 It's is True that your body temperature your body converts chemical potential energy into thermal energy
7 0
3 years ago
Read 2 more answers
Other questions:
  • How much force acts on one surface of a rectangular bedroom wall that is 2.20 m by 3.20 m when atmosspheric pressure is?
    15·1 answer
  • Scientific notation for 0.0058201
    9·1 answer
  • Suppose a profit-maximizing firm in a competitive market produces rubber bands. When the market price for rubber bands falls bel
    7·1 answer
  • What is energy and object has due to its motion
    11·1 answer
  • A spring of negligible mass and force constant k = 410 N/m is hung vertically, and a 0.200 kg pan is suspended from its lower en
    10·1 answer
  • In a new scenario, the block only makes it (exactly) half-way through the rough spot. How far was the spring compressed from its
    7·1 answer
  • Consider a car moving at a constant velocity. Recall that, for any object to move at a constant velocity, the net force acting o
    13·2 answers
  • What creates the changes in step 1,2,3 of the nitrogen cycle
    9·1 answer
  • Changr 20 min in to hr​
    5·1 answer
  • Current assets minus current liabilities is known as
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!