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3 years ago

You are skateboarding in your friend's driveway. You hit a rock and your

Physics

1 answer:

nekit [7.7K]3 years ago

3 0

Answer:

the rock hit the board you go flying because you board stops but you have energy still going so there for you go flying

Explanation:

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Consider a vertical elevator whose cabin has a total mass of 800 kg when fully loaded and 150 kg when empty. The weight of the e

Eddi Din [679]

Answer:

Part a)

$P = 4.71 \times 10^3 Watt$

Part b)

$P = 2.94 \times 10^3 W$

Part c)

$P = 9.4 \times 10^3 W$

Part d)

$P = 3.9 \times 10^3 W$

Explanation:

Part a)

When cabin is fully loaded and it is carried upwards at constant speed

then we will have

net tension force in the rope = mg

$T = (800)(9.81)$

$T = 7848 N$

now it is partially counterbalanced by 400 kg weight

so net extra force required

$F = 7848 - (400 \times 9.81)$

$F = 3924 N$

now power required is given as

$P = Fv$

$P = 3924 (1.2)$

$P = 4.71 \times 10^3 Watt$

Part b)

When empty cabin is descending down with constant speed

so in that case the force balance is given as

$F + (150 \times 9.8) = (400 \times 9.8)$

$F = 2450 N$

now power required is

$P = F.v$

$P = (2450)(1.2)$

$P = 2.94 \times 10^3 W$

Part c)

If no counter weight is used here then for part a)

$F = 7848 N$

now power required is

$P = F.v$

$P = 7848 (1.2)$

$P = 9.4 \times 10^3 W$

Part d)

Now in part b) if friction force of 800 N act in opposite direction

then we have

$F + (150 \times 9.8) = 800 +(400 \times 9.8)$

$F = 3250 N$

now power is

$P = (3250)(1.2)$

$P = 3.9 \times 10^3 W$

3 0

3 years ago

Find the voltage across the 15 Ohm resistor plz help ty

jonny [76]

Answer:

5.4 Volts is the answer!

Explanation:

Good luck with Acellus!

7 0

3 years ago

Why is physics important for high school students to learn?

Bond [772]

It is important for people to learn physics so that they can better understand the basic laws of the universe, and most importantly, so we can look at things with common sense, for you my friend i recommend watching <em>mythbusters</em>, they teach physics and make learning fun they teach you to look at the world with common sense. hope i helped!!! have a good day.

7 0

4 years ago

In which medium does sound travel the fastest?

AURORKA [14]

Answer:

Solids

Explanation:

The speed of sound is different in different mediums. Among solids, liquids, and gases, sound travels faster through solids. The particles in solids are more closes as compared to liquids and gases.

3 0

3 years ago

A 4.2 m board with a mass of 19 kg is pivoted at its center of gravity. A helium balloon attached 0.24 m from the left end of th

storchak [24]

Answer:

The torque on the board = 11.8 Nm in the anti-clockwise direction

Explanation:

Please find attached the explanation to the answer given.

Download docx

6 0

4 years ago