All categories

3 years ago

PLEASE HELP!!!!!!

Physics

2 answers:

Evgen [1.6K]3 years ago

8 0

Answer: The following answer was written by KaptainEasy, a user using this app, so credit goes to them. But I figured that it would be ok to send you their answer from a different post if I said that it hasn't been answered by me. Goodluck on future exams/assignments : )

"Rube Goldberg machines, follows the “law of conservation of energy”, this machine uses a chain reaction to complete a simple task in different manner,

In this machine, a various instant kinetic energy is transferred into potential energy and vice-versa , so the total energy remain conserved. Thus Rube Goldberg machines follows law of conservation of energy.

In this machine when marble rolls down from top it has kinetic energy. Then the marble hits and falls into a plastic cup, its kinetic energy is transferred into potential energy that lifts the soda can.Then potential energy is changed into kinetic energy. When the marble make contact with the next marble, then its kinetic energy is transferred to other marble. When marble falls its gravitational energy is released. This gravitational energy built up into kinetic energy, which was transferred to the domino. Each domino passes its energy to the next in a chain reaction until the last one sets off the mousetrap. As the mousetrap is set off, it discharges all of its stored potential energy which pulls back the scissors. The string tying down the balloon is cut, freeing the balloon and its potential energy stored."

prohojiy [21]3 years ago

5 0

Answer:

I don't know i am sry............

You might be interested in

What is the best definition

Cloud [144]

a is the correct answer

Explanation:

no.of proton defines atomic number in an atom

7 0

2 years ago

Read 2 more answers

You shoot an arrow into the air. Two seconds later (2.00 s) the arrow has gone straight upward to a height of 35.0 m above its l

sdas [7]

This question can be solved by using the equations of motion.

a) The initial speed of the arrow is was "9.81 m/s".

b) It took the arrow "1.13 s" to reach a height of 17.5 m.

We will use the second equation of motion to find out the initial speed of the arrow.

$h= v_it + \frac{1}{2}gt^2\\$

where,

vi = initial speed = ?

h = height = 35 m

t = time interval = 2 s

g = acceleration due to gravity = 9.81 m/s²

Therefore,

$35\ m = (v_i)(2\ s)+\frac{1}{2}(9.81\ m/s^2)(2\ s)^2\\\\v_i(2\ s)=19.62\ m\\\\v_i = \frac{19.62\ m}{2\ s}$

To find the time taken by the arrow to reach 17.5 m, we will use the second equation of motion again.

$h= v_it + \frac{1}{2}gt^2\\$

where,

g = acceleration due to gravity = 9.81 m/s²

h = height = 17.5 m

vi = initial speed = 9.81 m/s

t = time = ?

Therefore,

$17.5 = (9.81)t+\frac{1}{2}(9.81)t^2\\4.905t^2+9.81t-17.5=0$

solving this quadratic equation using the quadratic formula, we get:

t = -3.13 s (OR) t = 1.13 s

Since time can not have a negative value.

Therefore,

Learn more about equations of motion here:

brainly.com/question/20594939?referrer=searchResults

The attached picture shows the equations of motion in the horizontal and vertical directions.

4 0

2 years ago

Solve for (b) how many revolutions it takes for the cd to reach its maximum angular velocity in 1.36s?

Digiron [165]

Angular displacement of the cd is 3.25 rev

Explanation:

The question is incomplete. It is not given what is the maximum angular velocity of the cd.

Here we are going to assume that the maximum angular velocity is:

$\omega = 30 rad/s$

The motion of the cd is an accelerated angular motion, therefore we can use the following suvat equation:

$\theta = (\frac{\omega_0 + \omega}{2})t$

where:

$\theta$ is the angular displacement of the cd during the time interval t

$\omega_0$ is the initial angular velocity of the cd

$\omega$ is the final angular velocity

Here we have:

t = 1.36 s

$\omega_0 = 0$ (assuming the cd starts from rest)

Therefore, the angular displacement of the cd during this time is:

$\theta=(\frac{0+30}{2})(1.36)=20.4 rad$

And since $1 rev = 2 \pi rad$ , we can convert into number of revolutions completed:

$\theta = 20.4 rad \cdot \frac{1}{2\pi rad/rev}=3.25 rev$

Learn more about angular motion:

brainly.com/question/9575487

brainly.com/question/9329700

brainly.com/question/2506028

#LearnwithBrainly

8 0

3 years ago

a weightlifter lifts a 1000 newton barbell above his head from the floor to a height of 2.5 meters. he holds the barbell there f

solniwko [45]

Work done = Potential Energy = (mg)h

   mg = weight of the ball

   = 1000 N * 2.5 m = 2500 Joules.

The work done during the 5 second is 2500 Joules.

7 0

3 years ago

A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling west at 20.0 m/s. The cars stick together. What is

andriy [413]

Answer:

17.27m/s

Explanation:

M1U1 + M2U2 = (M1+M2)V

(900x15) + (750 x 20) = (900+750)V

13500+15000 = (1650)V

28500 = 1650v

V = 28500/1650 = 17.27m/s

V = 17.27m/s

5 0

3 years ago