PHYSICS MIDDLE SCHOOL

A baseball with a mass of 0.15 kg is moving at a speed of 40 m/s. What isthe baseball's kinetic energy?

Answers

Answer 1
Answer:

Answer:

120 J

Explanation:

KE = mv²/2 = (0.15 kg * [40 m/s]²)/2 = 120 J
Answer 2
Answer:

Answer:

120 J

Explanation:

KE = 1/2 mv²

KE = 1/2 (0.15)(40)²

KE = 1/2 (0.15)(1600)

KE = 1/2 (240)

KE = 120 J

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What is the speed of an arrow that takes 1.25 seconds to hit a target 75
meters away?

Answers

Answer:

60m/s

Explanation:

v=s÷t

75m÷1.25s=60m/s

Answer

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Explanation:

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The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle? (a)The moon pulls more on the shuttle. (b)The earth pulls more on the shuttle. (c)Both are equal due to equal distances.(d)Both are equal due to the mass of the shuttle.

Answers

Answer: B. The earth pulls more on the shuttle

Explanation:

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Answers

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Can someone help me on no. 6

Answers


Efficiency = (energy that does the job) / (total energy used)

               =                               (45 J)  /  (120J)

I think you can handle the division.

What is the major force that keeps the moon in it's orbit around the earth?

Answers

gravity is the answers
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· A hot, just-minted copper coin is placed in 101 g of water to cool. The watertemperature changes by 8.39°C, and the temperature of the coin changes
by 68.0°C. What is the mass of the coin?
Please helppp!!!

Answers

The mass of the copper coin placed in 101g of water is 135.3g.

COLORIMETER:

The mass of the copper coin can be calculated using the following expression:

Since; Q = mc∆T

Where;

  • Q = heat absorbed or released
  • m = mass of substance
  • c = specific heat capacity of substance
  • ∆T = change in temperature
  • mc∆T (water) = mc∆T (copper)

According to the question;

COPPER METAL:

  • m = ?
  • c = 0.385 J/g°C
  • ∆T = 68°C

WATER:

m = 101g

c = 4.18 J/g°C

∆T = 8.39°C

⇒ 101 × 4.18 × 8.39 = (0.385 × m × 68)

⇒ 3542.09 = 26.18m

⇒ m = 3542.09 ÷ 26.18

⇒ m = 135.3g

Therefore, the mass of the copper coin placed in 101g of water is 135.3g.

Learn more about specific heat at: brainly.com/question/13439286

#SPJ2

Answer:

135g

Explanation:
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