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bearhunter [10]
3 years ago
10

Karen is sitting in a movie theater, 11 meters from the screen. The angle of elevation from her line of sight to the top of the

screen is 13°, and the angle of depression from her line of sight to the bottom of the screen is 49°. Find the height of the entire screen.
Physics
1 answer:
ZanzabumX [31]3 years ago
5 0

Answer:

15.2m

Explanation:

The height of the screen would be the sum of the elevation height and the depression height, both make a triangle with her distance to screen with their respective angles

H = h_e + h_d

H = 11tan13^0 + 11tan49^0

H = 11(tan13^0 + tan49^0)

H =11*1.38 = 15.2 m

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puteri [66]

Answer:

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8 0
3 years ago
The temperature of 10 kg of a substance rises by 55oC when heated. Calculate the
guajiro [1.7K]

Given :

The temperature of 10 kg of a substance rises by 55oC when heated.

To Find :

The  temperature rise when 22 kg of the substance is heated with the same quantity of heat.

Solution :

We know, change in temperature when heat is given to object is given by :

\Delta H = m S\Delta T

It is given that same amount of heat is given in both the cases also the substance is same.

So,

M_1 S \Delta T_1 = M_2 S \Delta T_2\\\\10\times 55 = 22 \times \Delta T_2\\\\\Delta T_2 = 25^o\ C

Hence, this is the required solution.

7 0
3 years ago
A 0.500-kilogram cart traveling to the right on a horizontal, frictionless surface at 2.20 meters per second collides head on wi
babunello [35]

Consider the motion towards right as positive and motion towards left as negative.

m₁ = mass of the cart moving to right = 0.500 kg

v₁ = initial velocity before collision of the cart moving towards right = 2.2 m/s

m₂ = mass of cart moving to left = 0.800 kg

v₂ = initial velocity before collision of the cart moving towards left = - 1.1 m/s

initial momentum of the system of carts before the collision is given as

P₁ = m₁ v₁ + m₂ v₂

P₁ = (0.500) (2.2) + (0.800) (- 1.1)

P₁ = 0.22 kg m/s

P₂ = momentum of system of carts after collision

As per conservation of momentum,

Momentum of system of carts after collision = Momentum of system of carts before collision

P₂ = P₁

P₂ = 0.22 kg m/s



8 0
3 years ago
If an object emits or reflects light, A. it has a smooth surface. B. it can be seen by the eye. C. it must be the color white. D
kirill [66]

Answer:

It can be seen by the eye

Explanation:

Took the test

5 0
3 years ago
Read 2 more answers
Please Please answer! I will give brainiest and points if it's right!​
vichka [17]

Answer:

help me, I'll help you? please

5 0
3 years ago
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