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
Marysya12 [62]
3 years ago
9

3. A 142 g baseball is thrown at a speed of 42.9 m/s. What is the kinetic energy of the baseball at this moment?

Physics
1 answer:
krok68 [10]3 years ago
8 0
Kinetic energy=1/2mv^2
=1/2(142*10^-3)(42.9)^2=130.6=131J
You might be interested in
The speed of sound is measured to be 340 m/s on a certain day.
ziro4ka [17]
Answer: 1,224 km/h

Explanation:

To do this, we pick the first unit and convert
Picking m first and converting to km:
Since we're converting from a non-prefix to a prefix, we divide the value by the prefix were taking it to. In this case, kilo = 10³ which means we're going to divide our value by 1000 to convert it from m to km
340 m/s ÷ 1000 = 0.34 km/s
Now, let's convert our seconds to hour:
We'll need to calculate how many hours is equivalent to one second first;
1 hr = 60×60 seconds
X hr = 1 second
*Cross multiply*
1 × 1 = X × 60 × 60
1 = 3,600 X
X = 1 / 3,600
X = 2.778×10⁻⁴ hour
So, in the place of "1 Second", we're going to be inserting 2.778×10⁻⁴ hour instead
0.34 km / s = 0.34 km / 2.778×10⁻⁴ hour
(0.34 / 2.778×10⁻⁴) km/hour
1,224 km/h.
340 m/s = 1,224 km/h
6 0
2 years ago
Three 7 0hm resistors are connected in series across a 10 V battery. What is the equivalent resistance of the circuit?
Tomtit [17]

Given

Three 7 ohm resistor are in series.

The battery is V=10V

To find

The equivalent resistance

Explanation

When the resistance are in series then the resistance are added to find its equivalent.

Thus the equivalent resistance is:

R=7+7+7=21\Omega

Conclusion

The equivalent resistance is 21 ohm

4 0
11 months ago
What is the relationship between frequency ad wavelenght
Law Incorporation [45]

Answer:

Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength. For this reason, the wavelength ratio is the inverse of the frequency ratio.

7 0
3 years ago
Read 2 more answers
A 1.5kw vacuum cleaner is used for half an hour. Calculate its energy usage.​
juin [17]

Answer:

its energy usage is 0.05

Explanation:

1.5kw/30=0.05

8 0
2 years ago
15. A car is stationary at the top of a hill with the engine
White raven [17]

Answer:

kinetic energy

Explanation:

hop it is helpful

mark me brainlist

5 0
3 years ago
Other questions:
  • If the vertical component of velocity for a projectile is 7.3 meters/second, what is its hang time?
    11·1 answer
  • What does this mean Atoms and elements are the basic back bone of the universe .
    8·1 answer
  • A car moves at a constant speed of 10 m/s. If the car doesn't accelerate during the next 40 s how far will it go?
    9·1 answer
  • What are the products in the reaction in the introduction above? Select all that apply.
    8·1 answer
  • A compact car moving at 60 m/s has 320,000 J of kinetic energy. What is its mass?
    8·1 answer
  • A plate of uniform areal density is bounded by the four curves: where and are in meters. Point has coordinates and . What is the
    6·1 answer
  • Which of the following statements is correct A. College degree isn't as important as it was in the past b. Over time, I can earn
    14·1 answer
  • To have the highest magnification in a telescope, the focal length of the objective lens should be _________ and the focal lengt
    15·1 answer
  • Why does liquid water boil away when exposed to the Martian atmosphere?
    7·1 answer
  • An arrow is launched with an initial velocity of 7.6 m/s at an angle of 42 degrees above the horizontal. What is the horizontal
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!