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Kruka [31]
3 years ago
15

An ice skater spins with her arms outstretched at 1 revolution per second. She pulls her arms in toward her body. Does her angul

ar momentum change? Ignore friction with the ice.
Physics
1 answer:
MA_775_DIABLO [31]3 years ago
7 0

Answer:

Her angular momentum does not change.

Explanation:

Conservation of angular momentum: It states that there is no change in the angular momentum when no torque outside the system is applied to the body.

In the given problem, an ice skater spins her arm outstretched. She pulls her arms in towards her body.

The angular momentum of an ice skaters remains same as the there is no external torque applied on an ice skater. The initial angular momentum  and the final angular momentum of the given system are same. Therefore, the angular momentum is conserved.

Therefore, her angular momentum does not change.

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What is the magnitude of a point charge that would create an electric field of 1.18 N/C at points 0.822 m away?
katrin [286]

Answer:

q = 8.85 x 10⁻¹¹ C

Explanation:

given,

Electric field, E = 1.18 N/C

distance, r = 0.822 m

Charge magnitude = ?

using formula of electric field.

E = \dfrac{kq}{r^2}

k is the coulomb constant

q= \dfrac{Er^2}{k}

q= \dfrac{1.18\times 0.822^2}{9\times 10^9}

  q = 8.85 x 10⁻¹¹ C

The magnitude of charge is equal to q = 8.85 x 10⁻¹¹ C

4 0
3 years ago
The area of a triangle is 30 m². Using the equation A=12bh A = 1 2 b h , where b is base and h is height, solve for h if b = 3 m
Mama L [17]

Answer:

20 metres

Explanation:

Given that the area of a triangle is 30 square metres (m²). Using the equation A = 1/2bh, this is the formula for the triangle.

where b is base and h is height

Given that b = 3 metres.

To calculate h, Substitute b and A into the equation

30 = 1/2 × 3 × h

3h = 60

h = 60/3

h = 20 m

Therefore, h is equal to 20 metres

8 0
3 years ago
a 13 kg sled is moving at a speed of 3.0 m/s. at which of the following speeds will the sled have tace as mucb as the kinetic
Natali5045456 [20]
A 13-kg sled is moving at a speed of 3.0 m/s. At which of the following speed will the sled have twice as much kinetic energy?

<span>4.2 m/s</span>
6 0
3 years ago
A 1650 kg car accelerates at a rate of 4.0 m/s^2. How much force is the car's engine producing?
Westkost [7]
F = M A

Force = (mass) x (acceleration) 

                   = (1,650 kg) (4 m/s²) = 6,600 kg-m/s² = <em>6,600 Newtons</em>
7 0
3 years ago
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What type of material can charges move through easily?
Katyanochek1 [597]
Pass through it easily is called a Metals such as iron, steel, copper, and aluminum are good conductors.
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3 years ago
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