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Shkiper50 [21]
3 years ago
15

The field around a solenoid is similar to the field around a bar magnet. true or false?

Physics
1 answer:
OlgaM077 [116]3 years ago
8 0
The answer would be true :)
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A police car drives with a constant speed of 70km/hr. how long will it take to cover a distance of 135km?
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Explanation:

36. How long does it take a car to slow down from a speed of 54 km/h to 32 km/h over a distance of 65 m? Answer in seconds. 37.

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The gravitational force of attraction be-
Sliva [168]

Answer:

2.15 m

Explanation:

Newton's Law of Universal Gravitation:

\displaystyle F_g = G \frac{m_1 m_2}{r^2}  

  • \displaystyle F_g is the gravitational force of attraction
  • \displaystyle G is the universal gravitational constant
  • m_1 and m_2 are the two masses of the two objects
  • \displaystyle r is the distance between the centers of the two objects.

List the known values:

  • \displaystyle F_g = 3.47 \cdot 10^-^8 \ \text{N}  
  • \displaystyle G = 6.673 \cdot 10^-^1^1 \ \frac{Nm^2}{kg^2}
  • \displaystyle m_1 = 44.8 \ \text{kg} \\ m_2 = 53.9 \ \text{kg}
  • \displaystyle r =\ ?

Plug these values into the equation:

  • \displaystyle 3.47 \cdot 10^-^8 \ \text{N} = 6.673 \cdot 10^-^1^1 \ \frac{Nm^2}{kg^2} \frac{(44.8 \ \text{kg})(53.9 \ \text{kg})}{r^2}

Notice that the units \displaystyle \text{N}, \displaystyle \text{kg}^2, and \displaystyle \text{m} cancel out. We are left with the unit \displaystyle \text{m} for radius r.

Get rid of the units to make the problem easier to read.

  • \displaystyle 3.47 \cdot 10^-^8= 6.673 \cdot 10^-^1^1 \ \frac{(44.8)(53.9) \ }{r^2}  

Multiply the masses together.

  • \displaystyle 3.47 \cdot 10^-^8= 6.673 \cdot 10^-^1^1 \ \frac{(2414.72)}{r^2}

Multiply the gravitational constant and the masses together.

  • \displaystyle 3.47 \cdot 10^-^8= \frac{1.61134265\cdot 10^-^7}{r^2}

Solve for r^2 by dividing both sides by 3.47 * 10^(-8) and moving r^2 to the left.

  • \displaystyle r^2 = \frac{1.61134265\cdot 10^-^7}{3.47\cdot 10^-^8}
  • r^2 = 4.64363876

Take the square root of both sides.

  • r=2.154910383  

The students are sitting about 2.15 m apart from each other.

4 0
2 years ago
I need help on B. please help me
yuradex [85]
I think unbalanced forces is one of the reasons
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