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3 years ago

Can you help me? Thanks! 10+ points!

Physics

2 answers:

kykrilka [37]3 years ago

7 0

If u need any other help I’d help ! Honestly the person above me answered but feel free to message me if u need help ! I don’t really need the points !

Elis [28]3 years ago

4 0

Explanation:

velocity: average velocity equals Displacement /change in time.

Kinetic energy: K=1/2mv^2 (m = Mass) ( v = Velocity).

speed using the kinetic energy is also KE =1/2mv^2

(M in Kg) (V in m/s)

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Will plane flat mirror will make a real or virtual image? Real Virtual

Varvara68 [4.7K]

Image formed by a plane mirror is always virtual which means that the light rays do not actually come from the image but upright and these of the same shape and size are the object it is reflecting.

4 0

3 years ago

If you increase the mass but leave the volume the same what happens to the density of the object

atroni [7]

Density is a property of an object or substance that can be described through the correlation of the mass of an object over its volume.

Mathematically, density = mass / volume.
In description, the relationship of density and mass is positively correlated and with volume, inversely.
Since density and mass is positively correlated then if you increase the mass, the density of the object will also increase leaving density and volume the same.

Example:
Mass = 10 g changes to 20
Volume = 5 cm3
Density =?

1. D = m / v
2. D = 10 g / 5 cm3
3. D = 2 g / cm3
4. D = 20 g / 5 cm3
5. D = 4g/cm3

3 0

3 years ago

Two masses, m1 & m2 are separated by a distance of 12 m between their centers. The gravitational force attraction between th

Artemon [7]

The universal law of gravitation says that the gravitational force between the two masses is

F₁ = G m₁ m₂ / r ² = 6.0 × 10⁻⁶ N

where r = 12 m. When the distance between the two masses is reduced to R = 4 m, i.e. 1/3 of the original distance r, we have

F₂ = G m₁ m₂ / R ² = G m₁ m₂ / (r/3)² = 1/9 G m₁ m₂ / r ² = 1/9 F₁

so that the resulting gravitational force has 1/9 the first magnitude, or

F₂ = 1/9 (6.0 × 10⁻⁶ N) ≈ 6.7 × 10⁻⁷ N

6 0

3 years ago

Spiral fracture of bone: Spiral fracture of bone occurs due to twisting of the limb, and is a very common skiing accident. The f

Pavlova-9 [17]

Answer:

principal stresses :б1 = 32.62mPa б2 = 31.38mPa

Max Shear stress : 16.31 mPa

Orientation of max principle plane = 44.43°

Orientation of minimum principal plane = 134.43°

Explanation:

Given data:

Torque = 50 N-m

weight = 80 kgs

half of weight is subjected to each leg

radius of bone = 10 mm = 0.010 m

a) Determine the principal stresses and shear stress

first calculate the max shear stress ( this will occur in the outermost element

= 16T / π*d^3 where : T = 50 , d = 0.020 m

hence max shear stress = 32 mPa

next determine compressive stress

= ( 40*g) / π/4*d^2 . where : d = 0.020 m , g = 9.81

hence compressive stress = 1.24 mPa

draw and calculate the radius of Mohr's circle

radius of Mohr's circle = 32.0060

Hence principal stresses = 32.0060 ± 0.62

б1 = 32.62mPa

б2 = 31.38mPa

attached below is the remaining part of the solution

3 0

3 years ago

If 51.9 C of charge are transferred in a specific lightning strike and the potential difference is ∆V = 10.93 MV, how much energ

MA_775_DIABLO [31]

Quantity of charge unloaded = 51.9 Coulombs

Potential difference = 10.93 megavolts = 1.093 x 10⁷ volts

1 volt = 1 joule per coulomb

1.093 x 10⁷ volts = 1.093 x 10⁷ joules per coulomb

Energy = (1.093 x 10⁷ J/C) x (51.9 C)

Energy = 567.267 megaJoules

That's 5.67 x 10⁸ Joules .

==> My wife's blow-dryer is marked 1260 watts.

If the energy in this lightning strike could be collected, bottled, stored, and used as needed, it could run my wife's blow-dryer for 125 hours. That would save us more than $30 on our electric bill !

8 0

3 years ago