Which of the following is likely the best electrical insulator

Physics

1 answer:

Vesnalui [34]3 years ago

5 0

Is a vaccum cleaner there is no choices so here is one

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Q1: We drop this 0.1 kg apple 1 m. What speed does it hit the ground

77julia77 [94]

Potential energy is measured using formula Ep=mgh
m=mass (kg)
g= acceleration due to gravity (which is 9.8 on earth)
h= height in metres above ground

For this question
m=0.1
g=9.8
h=1
So Ep=0.1(9.8)(1)
Ep=0.98 Joules

When it is dropped all of this potential energy is converted into kinetic energy which can be measured using formula
Ek=1/2m(v^2) (v=final velocity)

Since all potential energy in this q is converted to kinetic we know Ek=0.98Joules and our mass is the same (0.1kg)

So when we sub everything in we get
0.98=1/2(0.1)(v^2)
0.98=0.05(v^2)||divide both side by 0.05
19.6=v^2 ||square root both sides
v=4.4 m/s

5 0

3 years ago

Anybody wanna help? (Picture Included?)

MrRissso [65]

There is your answer

4 0

3 years ago

Which situation is work not being done? A) A bookcase is slid across carpeting. B) A stack of books is carried at waist level ac

Nastasia [14]

Answer:

B) A stack of books is carried at waist level across a room

Explanation:

Work is defined as:

$W=Fd cos \theta$

where

F is the force applied

d is the displacement of the object

$\theta$ is the angle between the direction of the force and of the displacement

From the formula, we see that the work done is zero when the force and the displacement are perpendicular to each other. Let's now analyze each situation:

A) A bookcase is slid across carpeting. --> work is done, because the force that pushes the bookcase is in the same direction of the displacement

B) A stack of books is carried at waist level across a room. --> no work is done, because the force to carry the book is vertical, while the displacement of the books is horizontal

C) A chair is lifted vertically with respect to the floor. --> work is done, because the force that lifts the chair is vertical, and the displacement is vertical as well

D) A table is dropped onto the ground. --> work is done, because the force of gravity (that makes the table falling down) is vertical and the displacement of the table is also vertical.

5 0

3 years ago

PHYSICS! I AM TIMED!

Lana71 [14]

28J because mechanical energy is the sum of the potential energy and kinetic energy

8 0

3 years ago

Read 2 more answers

A body travels 10 meters during the first 5 seconds of its travel, and it travels a total of 30 meters over the first 10 seconds

Nesterboy [21]

Answer:

c. 4 meters/second