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4 years ago

How much total work is done by the force in lifting the elevator from 0.0 m to 9.0 m?

Physics

1 answer:

aksik [14]4 years ago

8 0

The total work is

(mass of the elevator, kg) x (9.8 m/s²) x (9.0 m) Joules .

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Desde que altura debes de lanzar una canica de 50g para que adquiera una energia de 100j

AnnZ [28]

Answer:

204 m

Explanation:

When the marble is dropped from a certain height, its gravitational potential energy converts into kinetic energy. So the kinetic energy gained is equal to the variation of gravitational potential energy:

$\Delta U=mg\Delta h$

where

m is the mass of the marble

g = 9.8 m/s^2 is the acceleration of gravity

$\Delta h$ is the change in height

In this problem, we have

m = 50 g = 0.05 kg

$\Delta U = 100 J$

Solving the formula for $\Delta h$ , we find the necessary height from which the marble should be dropped:

$\Delta h = \frac{\Delta U}{mg}=\frac{100}{(0.05)(9.8)}=204 m$

7 0

3 years ago

Which of the following equations represents Ohm’s Law? Select all that apply.

Vera_Pavlovna [14]

Answer : The correct options are, V=IR, I=V/R and R=V/I

Explanation :

Ohm's law : It is defined as an electric current is directly proportional to voltage and inversely proportional to resistance.

Formula of Ohm's law :

$V=I\times R$

Or,

$R=\frac{V}{I}$

or,

$I=\frac{V}{R}$

where,

R = resistance of a circuit

V = voltage of circuit

I = current flowing in a circuit

Hence, the correct options are, V=IR, I=V/R and R=V/I

6 0

3 years ago

Read 2 more answers

Our solar system is located in the center of the milky way galaxy. true or false

drek231 [11]

This question is true

4 0

3 years ago

An astronaut is said to be weightless when he/she travels in a satellite. Does it mean that the earth does not attract him/her

LekaFEV [45]

First of all, what a weight is? weight is m × g.. and when a person is in space then the force of gravity isn't acting on him or her, so yeah it will not have weight, but remember gravity is a very very low, now if a body has more mass, more gravity will act on it right? just imagine the mass of a person and that of earth.. now yes, earth will do exert a force on the astronaut but is negiligable.

7 0

3 years ago

What gravitational force does the moon produce

dangina [55]

Answer:

$F = 1.94 \times 10^{20} N$