Maria and Ben are both suffering from a hereditary disease, as described in the following table.

PLEASE HELP ME FAST!!!!!!!!!!!!!!!! WILL GIVE BRAINLIEST!!! PLEASE. Explain in three to five complete sentences, why scientists

zavuch27 [327]

Well iron, nickle, and cobalt can be natural magnets because they have minerals or metals that generate a stable magnetic field without artificial inducement. A piece of wood cannot be a natural magnet because it does not have metals or minerals that allow it to generate a stable magnetic field. Other types of metals that are magnetic are man made.

5 0

3 years ago

A cannon ball is shot horizontally off a 37.0 m cliff and lands a distance of 18.5 m

4vir4ik [10]

Answer:

vₓ = 6.73 m/s

Explanation:

Assuming no other external influences than gravity, in the horizontal direction (which we make to coincide with the x- axis) , speed is constant, so, applying the definition of average velocity, we can write the following equation:

$v_{x} = \frac{\Delta x}{\Delta t} (1)$

Now, in the vertical direction (coincident with the y- axis) , as both movements are independent each other, initial velocity is zero, so we can write the following equation for the vertical displacement:

$\Delta h = \frac{1}{2} * g * t^{2} (2)$

where Δh = -37.0 m , g = -9.8 m/s2
Solving (2) for t, we get:

$t = \sqrt{\frac{2*\Delta h}{g} } =\sqrt{\frac{2*37.0m}{9.8m/s2}} = 2.75 s (3)$

Taking t₀ = 0, ⇒ Δt = t
Replacing (3) in (1), we get:

$v_{x} = \frac{\Delta x}{\Delta t} = \frac{x}{t} = \frac{18.5m}{2.75s} = 6.73 m/s$

As the horizontal velocity is constant, the initial horizontal velocity is just the average one, i.e., 6.73 m/s.

5 0

3 years ago

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. what is the car's acceleration in meters per secon

barxatty [35]

Acceleration = change in velocity divided by time taken...

I.e Acceleration = (Final velocity - Initial Velocity) /time taken...

The question says the body accelerate from rest... Therefore it's initial velocity = 0

It reach a speed(velocity) of 20m/s.. My final velocity

And the time taken to attain the velocity = 5 seconds....

Therefore

acceleration = (20-0)/5

a = 20/5

a = 4ms¯²

Hope this helped....

3 0

3 years ago

How are Classical and positivist theories similar and different?

ELEN [110]

Answer: PLease see Explanation

Explanation:The key idea behind this theory was to use scientific methods to understand criminality and crime. ... The major difference between the two theories are that classical school is mainly based on free will and suggests that crime as a choice, whereas positivism criminology argues that crime is not a choice.

Please get me 5 star and 1 heart

3 0

2 years ago

A new ride being built at an amusement park includes a vertical drop of 126.5 meters. Starting from rest, the ride vertically dr

navik [9.2K]

Answer:

Potential energy converted = 4.2*10^7 [J]

Explanation:

This problem has to be analysed under the principle of energy conservation. For this case potential energy that is transformed into kinetic energy, but however not all potential energy is transformed into kinetic energy, as we are told that some of this energy dissipates in the form of heat. We must first find the potential energy.

Potential energy

$E_{p} =m*g*h\\where:\\m = mass =3.5*10^4[kg]\\g = gravity = 9.81[m/s^2]\\h = elevation = 126.5 [m]\\therefore\\E_{k} = 3.5*10^4*9.81*126.5\\E_{k} = 43433775 [J]$

Kinetic Energy

$E_{k}=\frac{1}{2} * m*v^{2}\\ where:\\v = velocity = 10[m/s]\\therefore:\\E_{k}=\frac{1}{2} * 3.5*10^4*10^{2}\\\\E_{k}=1750000[J]$

As we can see, not all potential energy has been transformed into kinetic energy. That is, part of this energy dissipates as thermal energy, so this difference of energies will be equal to the loss of energy represented as dissipated energy.

$Thermal Energy\\T_{e} = 43433775-1750000\\T_{e} =41683775[J]$

The previous value can be approximated to 4.2 * 10^7 [J]

7 0

3 years ago