3 years ago

What is the size of the smallest vertical plane mirror in which a 6 ft tall person standing erect can see her full-length image?

Physics

1 answer:

Alex Ar [27]3 years ago

5 0

Answer:

3 ft

..................

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Light hits a clear plastic bottle and a granite rock. Which choice most accurately describes the effect of visible light on the

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#4 is the accurate answer.

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The African bush elephant weights over 8 tons, which is more than the weight of 4 cars! At maximum speed, it can run up to 40 km

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3 years ago

Which one of the following statements concerning emf is true?

Andrej [43]

Answer:

C) Emf is the force exerted on a single charge to move it from one terminal to the other of an emf device.

Explanation:

Electromotive force, abbreviation E or emf, electrical energy per unit supplied from an energy source, such as an electrical generator or a battery. In the engine or battery, electricity is transformed from one source to another as the device works on the electrical charge that is passed within itself.

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A 10.0-kg box is pulled by a horizontal wire in a circle on a rough horizontal surface for which the coefficient of kinetic fric

QveST [7]

Answer:

a) $W_{f}=307.87 J$

b) $W_{f}=615.752 J$

c) Therefore it is a nonconservative force

Explanation:

Distance traveled in one complete circular trip against friction

$d=2\pi *r$

The force of friction is

$F_{f}=u*F_{N}$

$F_{N}=w*g$

The work of friction is the force of friction in the distance so

$W_{f}=-F_{f}*d$

a).

$F_{N}=10kg*9.8\frac{m}{s^2}$

$F_{N}=98N$

$F_{f}=0.250*98N$

$F_{f}=24.5N$

$W_{f}=-24.5N*2\pi*2m$

$W_{f}=307.87 J$

b).

$W_{f}=-24.5N*2\pi*4m$

$W_{f}=615.752 J$

c).

Since the circle returns to its initial position in both cases and the work done by the friction force different in both cases, so the friction force does depend on the path;

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