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
Shtirlitz [24]
3 years ago
12

A pitcher throws a baseball towards home plate. The baseball, which has a mass of 142 g, approaches the plate with 128 J of kine

tic energy.
Calculate the speed of the baseball.
Physics
1 answer:
mylen [45]3 years ago
5 0
Mass=142g
K.E=128 J
Speed or Velocity=?
K.E=1/2*m*v^2
128=1/2*142*v^2
128=72*v^2
v^2=128/72
v^2=1.777
by taking square rt 
v= 1.333ms-1
so the speed will be 1.333 ms-1
You might be interested in
38. You are fishing and catch a fish with a mass of
adoni [48]

Answer:

1.7333333m/s²

Explanation:

Tension of the line = the weight + force from pulling up the fish

30N = mg + ma

30 = (6)(9.8) + (6)a

10.4 = 6a

∴ a = 1.7333333m/s²

6 0
3 years ago
The picture below shows a wheelbarrow. Using a wheelbarrow can make it easier to lift a heavy object by
timofeeve [1]

Answer:

B IS CORRECT

Explanation:

8 0
3 years ago
Fill in the blanks.<br>In what way are speed and velocity different?​
IrinaVladis [17]
Volocity can be the wave length of the speed like the volume.
8 0
3 years ago
Read 2 more answers
A -kilogram car travels at a constant speed of 20. meters per second around a horizontal circular track. The diameter of the tra
Tatiana [17]

Answer:

The centripetal acceleration of the car is 8\ m/s^2.

Explanation:

Let the mass of the car, m=10^3\ kg

Diameter of the circular path, d = 100 m

Speed of car, v = 20 m/s

Radius, r = 50 m

When an object moves in a circular path, the centripetal acceleration acts on it. It is given by :

a=\dfrac{v^2}{r}

a=\dfrac{(20\ m/s)^2}{50\ m}

a=8\ m/s^2

So, the centripetal acceleration of the car is 8\ m/s^2. Hence, this is the required solution.

4 0
3 years ago
Which of the following involve an increase in the entropy of the system under consideration? a. melting of a solid b. evaporatio
Mama L [17]

Explanation:

Since, entropy is the measure of degree of randomness. So, more randomly the molecules of a substance are moving more will be its entropy.

  • For example, when a solid melts then it means heat is absorbed by it due to which its molecules have gained energy. As a result, they collide with each other and hence, entropy will increase.
  • Evaporation of a liquid will also cause the liquid to change its state from liquid to gas. This means molecules will go far away from each other leading to an increase in the entropy.
  • Sublimation is a process of conversion of a solid into gaseous phase without going through liquid phase. So, in this case also entropy will increase due to gain in energy by the molecules of a solid.
  • In freezing, molecules of a substance come closer to each other and acquire less energy. Hence, entropy decreases.
  • Mixing is a process of combining two or more substances physically with each other. This leads to increase in entropy of a substance.
  • In separation molecules are separated from each other leading to a decrease in energy. Hence, entropy will also decrease.
  • Diffusion is a process in which molecules are able to rapidly move from one place to another. Hence, entropy increases when diffusion takes place.

Thus, we can conclude that melting of a solid, evaporation of a liquid, sublimation, mixing and diffusion involve an increase in the entropy of the system under consideration.

8 0
3 years ago
Other questions:
  • A 5.00-a current runs through a 12-gauge copper wire (diameter 2.05 mm) and through a light bulb. copper has 8.5 * 1028 free ele
    14·2 answers
  • What is the net displacement of the particle between 0 seconds and 80 serving seconds
    11·1 answer
  • Volume of an block is 5 cm3. If the density of the block is 250 g/cm3, what is the mass of the block ?​
    12·1 answer
  • A certain simple pendulum has a period on the earth of 2.00 s . part a what is its period on the surface of mars, where g=3.71m/
    10·1 answer
  • Small paragraph explaining how how potential and kinetic energy are related
    8·2 answers
  • A soccer player kicks a ball with a speed of 30 m/s at an angle of 10. How long does the ball stay in the air?
    12·1 answer
  • Neha swims in a 90 m long pool. She covers 180 m in
    13·1 answer
  • kenneth warmed up a 100- ml sample of air in and expandable container. he displayed the resluts in the following graph. the resl
    13·1 answer
  • Calculate the speed of a bus that travels a distance of 55 miles in 0.75 hours.
    10·2 answers
  • What is the mechanical advantage of a pulley system​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!