All categories

3 years ago

A 500.-kg roller coaster car starts from rest at the top of a 60.0-meter hill.

1 answer:

8 0

1.47x10^5 Joules
The gravitational potential energy will be the mass of the object, multiplied by the height upon which it can drop, multiplied by the local gravitational acceleration. And since it started at the top of a 60.0 meter hill, halfway will be at 30.0 meters. So
500 kg * 30.0 m * 9.8 m/s^2 = 147000 kg*m^2/s^ = 147000 Joules.
Using scientific notation and 3 significant figures gives 1.47x10^5 Joules.

You might be interested in

A whale comes to the surface to breathe and then dives at an angle 24 degrees to the horizontal surface of the water. The whale

WARRIOR [948]

Given that,

A whale dives at an angle of 24 degrees to the horizontal surface of the water.

The whale continues in a straight line 145 m.

To find,

The horizontal and vertical components of the displacement of the whale.

Solution,

The horizontal component of displacement is :

$d_x=d\cos\theta\\\\=145\times \cos(24)\\\\=132.46\ m$

The vertical component of displacement is :

$d_y=d\sin\theta\\\\=145\times \sin(24)\\\\=58.97\ m$

<h3>Hence, the horizontal and vertical components of the displacement of the whale are 132.46 m and 58.97 m.</h3>

7 0

2 years ago

How do I calculate the amount of work done using the information on the graphs given?

Nataly [62]

Answer:with the power of math and physic

Explanation:

3 0

1 year ago

1. Suppose you have a metal bar. Its mass is 57.9g and its volume is 3cm'. What is its<br> density?

mariarad [96]

¡Hellow!

How we know, for calculate density, we can use the formule:

$\boxed{\textbf{p = m / v} }$

<u>Where:</u>

$\sqrt{$ p = Density = ?

$\sqrt{$ m = Mass = 57,9 g

$\sqrt{$ v = Volume = 3 cm³

Let's replace according we information:

p = 57,9 g / 3 cm³

p = 19,3 g/cm³

The density of the metal bar is <u>19,3 g/cm³.</u>

<u></u>

¿Good luck?

3 0

3 years ago

You are on an interstellar mission from the Earth to the 8,7 light-years distant star Sirius. Your spaceship can travel with 70%

marishachu [46]

Answer:

Time = 12.43 years

Mass = 4.71.43kg

Explanation:

Given the following :

Distance = 8.7 light years

Speed = 70% the speed of light

Diameter = 6m

Lengtg = 25m

Density = 1 hydrogen atom/m^3

Mass of proton(Me) = 1.673x 10^-27

A.) time it takes your spaceship to reach Sirius :

From the relation: Speed = (distance / time)

Time = distance / speed

Time = (70/100) × 1 light year

Distance = 8.7 light years

Time = 8.7 / 0.7 = 12.4285 years

Time = 12.43 years

B.) Mass of inter-stellar gas that collides with the spaceship can be calcuted by finding the product of the surface area of the cylindrical space ship and the mass of proton.

That is ;

surface area * mass of proton

Surface area of a cylinder = 2πrh + πr^2×Me

= 2πrh + Me×πr^2)

=( 2 × 22/7 × 3 × 25) + (22/7 × 3^2 × 1.673 * 10^-27)

= 2× 235.714 + 28.285) × 1.673 * 10^-27

= 471.428 + 47.31 * 10^-27

= 471.428 + 4.73 × 10^-26

= 4.71.43kg approximately

7 0

3 years ago

Two or more different monomers will link to form a

-BARSIC- [3]

d. natural gas is the answer

7 0

3 years ago