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
Ainat [17]
3 years ago
7

After hitting a long fly ball that goes over the right fielder's head and lands in the outfield, the batter decides to keep goin

g past second base and try for third base. The 67 kg player begins sliding 3.40 m from the base with a speed of 4.35 m/s. a.) If the player comes to rest at third base, how much work was done on the player by friction? b.) If the player comes to rest at third base, What was the coefficient of kinetic friction between the player and the ground?
Physics
1 answer:
jarptica [38.1K]3 years ago
5 0

Answer:

a) 633.39 J

b) 0.28

Explanation:

a)The kinetic energy of the player = \frac{1}{2} mv^{2}

Work done by friction = energy change of the player

                                    = \frac{1}{2} 67(4.35)^{2} = 633.9 J

b) Assuming the frictional force stays constant,

Work done by friction = Frictional force×distance

Frictional force = kinetic friction(μ)×normal reaction

Normal reaction = weight = mass×gravitational acceleration ( g=10m/s2 )

Combining these equations

633.9  =  F×3.4 ⇒ F = 186.44 N

F = μmg ⇒ μ = F/mg

                     = 186.44/670

                      = 0.28

You might be interested in
The water flowing through a 2.0 cm (inside diameter) pipe flows out through three 1.3 cm pipes. (a) If the flow rates in the thr
Verdich [7]

Answer:

a)54L/min

b)0.845

Explanation:

a) A x V=A_1V_1+ A_2V_2+A_3V_3

where suffix 1,2,3 refers to the three pipes.

            =27L/min+16L/min+11 L/min

            =54L/min

b) A x V=54L/min => \frac{\pi }{4} d^2 x v

   d= 2 cm

\frac{\pi }{4} d^2 x v = 54

v= \frac{4}{\pi } x \frac{54}{2^2}

-> A_1 x V_1=27L/min => \frac{\pi }{4} d_1^2 x v_1

d_1= 1.3cm

\frac{\pi }{4} d^2 x v_1 = 27

v_1= \frac{4}{\pi } x \frac{27}{1.3^2}

Next is to find the ratio of speed i.e \frac{v}{v_1}

\frac{4}{\pi } x \frac{54}{2^2} / \frac{4}{\pi } x \frac{27}{1.3^2} => \frac{54}{27} \frac{1.3^2}{2^2}

\frac{v}{v_1}= 0.845

8 0
3 years ago
Which of the following statements about energy is true? I. Kinetic energy cannot be transformed into another type of energy. II.
Mashcka [7]

Answer: B. II and III only

Explanation:

Let’s begin by explianing what energy is: the ability of matter to produce work in the form of movement, light, heat, among others. In this sense, there are several types of energy, but we will talk especifically in this case about <u>kinetic energy</u> and <u>potential energy</u>.

<u>Kinetic energy </u>is the energy an object or body has due to its movement and depends on the mass and velocity of the object or body.

To understande it better: If an object is at rest, its velocity is null and it does not have kinetic energy, however, if the object is moving, then it has kinetic energy.

On the other hand, <u>Potential energy</u> is known as <em>“stored energy”</em> that has the potential to be converted into energy of motion (kinetic energy) or another type of energy (thermal energy, for example). In addition, this energy is related to the work done when a certain force moves an object or body from its natural resting state along a distance to a new position.

So, according to this, Kinetic energy can be transformed into potential energy and Potential energy can be transformed into kinetic energy or any other type of energy. Hence, options II and III are correct.

8 0
3 years ago
Read 2 more answers
Which law of motion accounts for the following statement?
strojnjashka [21]
I know that its not the second law. I'm almost positive its the first one. Please let me know if I'm wrong. This sentence makes no sense when you put it with the third law. So, the first law is my guess...
3 0
3 years ago
Read 2 more answers
Calculer l intensité du courant qui le traverse
MissTica

Answer:

Le calcul du courant se fait avec deux éléments : la tension et la valeur de la résistance. Courant (A) = tension (V) / résistance (Ohm) ce qui donne la formule I = U/R.

please mark me as brainalist

6 0
2 years ago
1. An airplane flies 800 kilometers east from Denver to Wichita in one hour. Then the plane flies west back to Denver in the sam
Bumek [7]

B. The velocity of the second flight is negative compared to the speed.

3 0
3 years ago
Other questions:
  • If you have 4 kg of a sample with density of 1 897 g/ml what is the volume
    6·1 answer
  • Will give brainliest!!
    7·1 answer
  • How is the scientific meaning of acceleration different from how we use the term acceleration in everyday life?
    6·1 answer
  • If the centripetal and thus frictional force between the tires and the roadbed of a car moving in a circular path were reduced,
    10·2 answers
  • A car is moving 18 m/s to the eat. If it takes the car 5 seconds to reach a velocity of 19 m/s to the east, what is its accelera
    6·1 answer
  • Two cars, A and B , travel in a straight line. The distance of A from the starting point is given as a function of time by xA(t)
    6·1 answer
  • Do compressional waves need a medium? If so which one would be the fastest ans slowest medium.
    11·1 answer
  • Defination coulomb's law.
    7·1 answer
  • What type of energy requires the motion of an object?
    6·1 answer
  • When a bow releases an arrow, the arrow
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!