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3 years ago

Calculate the time it would take a motor with a power of 0.6kW to lift a suitcase of 20kg a distance of 50cm

Physics

1 answer:

True [87]3 years ago

7 0

Answer:

0.163 s

Explanation:

Appying,

P = mgh/t................ Equation 1

Where P = power of the motor, m = mass of the suitcase, h = vertical distance, t = time, g = acceleration due to gravity.

make t the subject of the equation,

t = mgh/P................ Equation 2

Given: m = 20 kg, h = 50 cm = 0.5 m, P = 0.6 kW = 600 W

Constant: g = 9.8 m/s²

Substitute these values into equation 2

t = (20×0.5×9.8)/600

t = 0.163 s

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A 150g copper bowl contains 220g of water, both at 20.0oC, A very hot 300 g copper cylinder is dropped into the water, causing t

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3 years ago

A typical person's eye is 2.5 cm in diameter and has a near point (the closest an object can be and still be seen in focus) of 2

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Answer:

2.27 cm

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Explanation:

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Lens Equation

$\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\\\Rightarrow \frac{1}{f}=\frac{1}{25}+\frac{1}{2.5}\\\Rightarrow \frac{1}{f}=\frac{11}{25}\\\Rightarrow f=\frac{25}{11}=2.27\ cm$

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when $u=\infty$

$\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\\\Rightarrow \frac{1}{f}=\frac{1}{\infty}+\frac{1}{2.5}\\\Rightarrow \frac{1}{f}=\frac{1}{2.5}\\\Rightarrow f=\frac{2.5}{1}=2.5\ cm$

The maximum effective focal length of the focusing mechanism of the typical eye is 2.5 cm

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3 years ago

Give two important reasons to do a rough sketch of the crime scene?

Sergio [31]

Tampered evidence/tampered corpse?

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4 years ago

Question 11 (3 points)

kykrilka [37]

Answer:

С. 10.41 Ampere

Explanation:

Given that,

Power, P = 125 watts

Voltage, V = 12 volts

We need to find current. Power in terms of current and voltage is given by :

P = VI, I = current

$I=\dfrac{P}{V}\\\\I=\dfrac{125\ W}{12\ V}\\\\I=10.41\ A$

So, the current is 10.41 A.

5 0

3 years ago