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4 years ago

Which glass is used in astrology? what is its focal length?

Physics

2 answers:

s2008m [1.1K]4 years ago

8 0

Answer:

Convex lens is used in astrology. "For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive, and is the distance at which a beam of collimated light will be focused to a single spot."

Explanation:

Maksim231197 [3]4 years ago

5 0

Answer:

Convex lens is used in astrology

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The image shows a model of the gravitational field around Earth. Which best describes the model?

GuDViN [60]

Answer: The model is described by :

The strength of the field increases as you get closer to Earth, as shown by the smaller spaces between the circles.

Explanation :

According to universal gravitational law, the force acting in the universe between two objects is given by :

$F=G\dfrac{m_1m_2}{r^2}$

It is clear that the gravitational force depends directly on the product of masses and inversely on the square of the distance between them.

The given image shows a model of the gravitational field around Earth. The arrows in the image show the direction of the force. Gravitational field depends on the position of objects.

As we move closer to the earth, the force increases and hence the field increase.

So, the correct option is (D) " The strength of the field increases as you get closer to Earth, as shown by the smaller spaces between the circles ".

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4 years ago

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A solenoid with a ferromagnetic core is

Ivenika [448]

A coil of current - carrying wire that produces a magnetic field is called a solenoid. An ? is a solenoid with a ferromagnetic core. ?, a device that uses a solenoid to measure small amounts of current. An ? motor is a device that uses an electromagnet to turn an axle.

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3 years ago

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Match the measurements with the proper SI unit.

Ivan

Answer:

Acceleration:

C. Meters per second squared

Velocity:

B. Meters per second

Distance:

A. Meters

Explanation:

We must remember that the international system of measures (SI) takes into account for the length as the main unit the meter, for the mass the kilogram, for the time the second.

The acceleration is calculated using the following expression

a = v/t = (m/s/s) = (m/s^2]

The velocity is calculated using the following expression

v = x/t = (m)/(s) = (m/s)

The distance for the SI system is given in meters

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3 years ago

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Could you please solve it with shiwing the full work

tia_tia [17]

Answer:

1.V= 640.48 m/s :total velocity in t= 5s

2. Y= 5.79m : vertical distance above the height of release (in meters) where the ball will hit a wall 13.0 m away

3. v =25m/s

4. s= (-1.5t³+26t ) m

Explanation:

1. Parabolic movement in the x-y plane , t=5s

V₀=638.6 m/s=Vx :Constant velocity in x

Vy=V₀y +gt= 0+9.8*5 = 49 m/s : variable velocity in y

$v=\sqrt{v_{x} ^{2} +v_{y} ^{2} }$

$v=\sqrt{ 638.6^{2} +49 ^{2} }$

V= 640.48 m/s : total velocity in t= 5s

2. $v_{ox} =v_{o} cos33.2=20.9*cos33,2= 17.49 m/s$

$v_{oy}=v_{o}*sin33,2 =20.9*sin33,2=11.44 m/s$

x=v₀x*t

13=v₀x*t

13=17.49*t

t=13/17.49=0.743s : time for 13.0 m away

th=v₀y/g=11.44/9.8= 1,17s :time for maximum height

at t=0.743 sthe ball is going up ,then g is negative

y=v₀y*t - 1/2 *g¨*t²

y=11.44*0.743 -1/2*9.8*0.743²

y= 5.79m : vertical distance above the height of release (in meters) where the ball will hit a wall 13.0 m away

3. s = (1t3 + -5t2 + 3) m

v=3t²-10t=3*25-50=75-50=25m/s

at t=0, s=3 m

at t=5s s=5³-5*5²+3

4. a = (-9t) m/s2

a=dv/dt=-9t

dv=-9tdt

v=∫ -9tdt

v=-9t²/2 + C1 equation (1)

in t=0 , v₀=26m/s ,in the equation (1) C1= 26

v=-9t²/2 + 26=ds/dt

ds=( -9t²/2 + 26)dt

s= ∫( -9t²/2 + 26)dt

s= -9t³/6+26t+C2 Equation 2

t = 0, s = 0 , C2=0

s= (-9t³/6+26t ) m

s= (-1.5t³+26t ) m

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3 years ago

A car is traveling at 20 m/s. It takes the car 120s to go from one intersection to a second. What was the displacement of the ca

Bad White [126]

We don't know if the road is perfectly straight between the intersections, or if the road bends, curves, or turns between them. So we don't have enough information to calculate the displacement between them.

But we can calculate the distance the car traveled between them.

Distance = (speed) (time)

Distance = (20 m/s) (120 s)

Distance = 2,400 meters

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3 years ago

Which glass is used in astrology?​ what is its focal length?​

Which glass is used in astrology? what is its focal length?