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miv72 [106K]
3 years ago
10

Carole is very tired and makes coffee. Why would Newton say that she must use her hand to pick up the cup? A) The idiom that eve

ry action has an equal and opposite reaction applies. B) An object at rest will stay in at rest unless acted upon by an external force. C) Acceleration of the object is indirectly proportional to the balanced forces. D) The coffee's inertia accelerates with the force due to the unbalanced forces
Physics
2 answers:
Angelina_Jolie [31]3 years ago
7 0

Answer:

The correct answer is  option B.

Explanation:

Newton laws of motion:

1.An object will remain at rest or in motion in a straight line unless an external force tries to change its state.

2. The force is equal to the change in momentum with respect to time.

        Force = mass × Acceleration

3. Every action has an equal and opposite reaction.

So, when in order to pick her cup she has to exert some force on cup which was at rest. Moment she exerts the force on cup to pick she just changes its state from rest to motion.

kozerog [31]3 years ago
5 0

Carole is very tired and makes coffee. Newton would say that she must use her hand to pick up the cup, because an object at rest will stay at rest unless acted upon by an external force. <em>(B)</em>

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Calculate the recoil speed of a 1.4 kg rifle shooting 0.006 kg bullets with muzzle speed of 800 m/a.3.43 m/s
Angelina_Jolie [31]

Answer:

a) 3.43 m/s

Explanation:

Due to the law of conservation of momentum, the total momentum of the bullet - rifle system must be conserved.

The total momentum before the bullet is shot is zero, because they are both at rest, so:

p_i = 0

Instead the total momentum of the system after the shot is:

p_f = mv+MV

where:

m = 0.006 kg is the mass of the bullet

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The total momentum is conserved, therefore we can write:

p_i = p_f

Which means:

0=mv+MV

Solving for V, we can find the recoil velocity of the rifle:

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5 0
3 years ago
A long solenoid of radius 3 cm has 1100 turns per meter. If the solenoid carries a current of 1.5 A, then calculate the magnetic
Arada [10]

Answer:

The magnetic field at the center of the solenoid is 2.1  × 10⁻³ T

Explanation:

The magnetic field B at the center of the solenoid is given by

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So B = μ₀ni

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= 2.07345 × 10⁻³ T

≅ 2.1  × 10⁻³ T

So the magnetic field at the center of the solenoid is 2.1  × 10⁻³ T

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