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Aleksandr [31]
2 years ago
13

1) Name one thing that can cause global warming

Physics
1 answer:
max2010maxim [7]2 years ago
6 0
Air pollution!! Can I have brainlyist:))
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What is the distance from axis about which a uniform, balsa-wood sphere will have the same moment of inertia as does a thin-wall
andrey2020 [161]

Answer:

D_{s} ≈ 2.1 R

Explanation:

The moment of inertia of the bodies can be calculated by the equation

     I = ∫ r² dm

For bodies with symmetry this tabulated, the moment of inertia of the center of mass

Sphere               Is_{cm} = 2/5 M R²

Spherical shell   Ic_{cm} = 2/3 M R²

The parallel axes theorem allows us to calculate the moment of inertia with respect to different axes, without knowing the moment of inertia of the center of mass

    I = I_{cm} + M D²

Where M is the mass of the body and D is the distance from the center of mass to the axis of rotation

Let's start with the spherical shell, axis is along a diameter

     D = 2R

    Ic = Ic_{cm} + M D²

    Ic = 2/3 MR² + M (2R)²

    Ic = M R² (2/3 + 4)

    Ic = 14/3 M R²

The sphere

    Is =Is_{cm} + M [D_{s}²

    Is = Ic

    2/5 MR² + M D_{s}² = 14/3 MR²

    D_{s}² = R² (14/3 - 2/5)

    D_{s} = √ (R² (64/15)

    D_{s} = 2,066 R

3 0
3 years ago
Would a pair of scissors with really long blades and a short handle be practical? Why or why not?
Lana71 [14]
Yes, for balance.hope this helped.

6 0
3 years ago
The point in a planet's orbit where it is closest to the Sun is the _____.
hammer [34]
This is called the perihelion.
5 0
3 years ago
An independent-measures design is also known as a _______________ design.
lesya692 [45]

An Independent Group/ between-subjects design differs from a within-subjects design in that a between-subjects design. The correct option is B.

<h3>What is independent measure design?</h3>

Studying between subjects (or between groups): As various subjects are used to test each condition, each subject is only exposed to a single user interface. internal topic (or iterative measurement) The same topic evaluates every circumstance (that is, all user interfaces).

Each participant in a topic or intergroup design only encounters one condition, and the group differences between individuals under various conditions are compared. The in-subject design, in which every participant is exposed to every condition, is the antithesis of this.

Learn more about between subject design here:

brainly.com/question/13860902

#SPJ4

3 0
1 year ago
in what distance can a 1500kg automobile be stopped if the brake is applied when the speed is 20m/s and the coefficient of slidi
natali 33 [55]

1) The braking force is provided by the frictional force, which is given by:

F_f=\mu m g

where

\mu=0.7 is the coefficient of friction

m=1500 kg is the mass of the car

g=9.81 m/s^2 is the gravitational acceleration


Substituting numbers into the equation, we find

F_f= (0.7)(1500 kg)(9.81 m/s^2)=10301 N


2) The work done by the frictional force to stop the car is equal to the product between the force and the distance d:

W=-F_fd (1)

where we put a negative sign because the force is in the opposite direction of the motion of the car.


3) For the work-energy theorem, the work done by the frictional force is equal to the variation of kinetic energy of the car:

\Delta K=K_f -K_i =W (2)

The final kinetic energy is zero, so the variation of kinetic energy is just equal to the initial kinetic energy of the car:

\Delta K=-K_i=-\frac{1}{2}mv^2=-\frac{1}{2}(1500 kg)(20 m/s)^2=-300000 J


4) By equalizing eq. (1) and (2), we find the distance, d:

-K_i = -Fd

d=\frac{K_i}{F}=\frac{300000 J}{10301 N}=29.1 m

8 0
3 years ago
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