I need help this is for physical Science! (need asap)

A section of a sphere has a radius of curvature of 0.72 m. If this section is painted with a reflective coating on both sides, w

vaieri [72.5K]

Answer:

The value is $f = 0.36 \ m$

Explanation:

From the question we are told that

The radius of curvature is $R = 0.72 \ m$

Generally the radius of curvature is mathematically represented as

$R = 2f$

Here $f$ is the focal length hence

$f = \frac{R}{2}$

=> $f = \frac{0.72}{2}$

=> $f = 0.36 \ m$

3 0

3 years ago

Two objects are moving at equal speed along a level, frictionless surface. The second object has twice the mass of the first obj

denis23 [38]

Answer:

E)The two objects rise to the same height : h₁=h₂ =( v²) / (2g)

Explanation:

With coefficient of kinetic friction, μk =0:

We apply the principle of energy conservation :

E₀ = Ef Formula (1)

K₀+U₀ = Kf + Uf Formula (2)

K = (1/2) *m*v² Formula (3)

U = m*g*h Formula (4)

Where:

E₀:

Initial total energy (J)

Ef: Final total energy (J)

K₀: Initial kinetic energy (J)

U₀: Initial potential energy (J)

Kf: Final kinetic energy (J)

Uf:

Final kinetic energy (J)

v : speed (m/s)

m: mass (kg)

h : hight (m)

Known data

v₁=v₂=v

m₁=m

m₂ =2m

μk =0 : coefficient of kinetic friction

Problem development

We apply formulas (1), (2), (3) and (4) for the first object ,(1):

E₀₁ = Ef₁

K₀₁+U₀₁ = Kf₁ + Uf₁ U₀₁=0 , Kf₁ =0 , m₁=m

(1/2) *m*v²+0 =0+m*g*h₁ :We eliminate m,then,

(1/2) *v²=g*h₁

h₁ =( v²) /(2g)

We apply formulas (1), (2), (3) and (4) for the second object ,(2):

E₀₂ = Ef₂

K₀₂+U₀₂ = Kf₂ + Uf₂ U₀₂=0 , Kf₂ =0 , m₂=2m

(1/2) *2m*v²+0 =0+2m*g*h₂ :We eliminate m,then,

(1/2) *2*v² =2*g*h₂ : We divide by 2 on both sides of the equation,then,

(1/2) *v²=g*h₂

h₂ =( v²) / (2g)

8 0

3 years ago

assume a nation's nominal GDP is $1.5 trillion with an inflation rate of 5%. find its real GDP. PLEASE HELPPPPPP

il63 [147K]

Formula is calculated by

GDP deflator =Nominal GDP/Real GDP ×(100/1)

7 0

4 years ago

Proton traveling across a capacitor A proton enters with a velocity v between the plates of a capacitor as shown in the figure.

yulyashka [42]

Answer:

Please see the direction of force in the attachment

Explanation:

As the particle enters the capacitor, it experiences electric. In order to move in the same direction as the electron was moving before entering the capacitor, the force due to the electric field of capacitor must be balanced by the magnetic field.

The direction of particle is shown in the attachment.

As we know,

Force = q (v *B)

3 0

3 years ago

Which statement explains what happened next? Positive feedback caused his pancreas to stop secreting insulin. Negative feedback

Volgvan

Answer:

Negative feedback caused his pancreas to produce more insulin.

Explanation:

Positive feedback is a feedback that causes an increase of product as a result of change while negative feedback is a feedback that causes a decrease in product as a result.

Negative feedback mechanism can be shown in the body as the control of blood sugar. The blood sugar is the product to be controlled. When there is an increase in blood sugar, the nerves sense a change. This change leads to secretion of insulin by the pancreas until homeostasis and then the secretion stops.

6 0

3 years ago

Read 2 more answers