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Alenkinab [10]
3 years ago
13

A sky diver steps from a high-flying helicopter. If there were no air resis- tance, how fast would she be falling at the end of

a 12-second jump?
Physics
1 answer:
vodomira [7]3 years ago
4 0

speed at end is accn of gravity x time

9.81x12=just over98.1m/s

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NHT0015
poizon [28]

Answer:

(1) 1×10⁻⁴

Explanation:

From the question,

α = (ΔL/L)/(ΔT)............. Equation 1

Where α = linear expansivity of the metal plate, ΔL/L = Fractional change in Length, ΔT = Rise in temperature.

Given: ΔL/L = 1×10⁻⁴, ΔT = 10°C

Substitute these values into equation 1

α  = 1×10⁻⁴/10

α = 1×10⁻⁵ °C⁻¹ .

β = (ΔA/A)/ΔT................... Equation 2

Where β = Coefficient of Area expansivity, ΔA/A = Fractional change in area.

make ΔA/A the subject of the equation

ΔA/A = β×ΔT.......................... Equation 3

But,

β = 2α.......................... Equation 4

Substitute equation 4 into equation 3

ΔA/A = 2α×ΔT................ Equation 5

Given: ΔT = 5°C, α = 1×10⁻⁵ °C⁻¹

Substitute into equation 5

ΔA/A = ( 2)×(1×10⁻⁵)×(5)

ΔA/A  = 10×10⁻⁵

ΔA/A  = 1×10⁻⁴

Hence the right option is (1) 1×10⁻⁴

3 0
3 years ago
From the above diagram, which phase of the Moon will result in the greatest difference between high and low tide? A. New Moon B.
aliya0001 [1]
New moon, because the New Moon (A) because the sun and the moon work together most when it is there on the tides
8 0
3 years ago
Read 2 more answers
A cube of wood is floating on water. a cube of iron is totally submerged in water. the cubes are equal in volume. which cube has
-BARSIC- [3]
The one that's completely submerged is displacing more water, so the buoyant force on it is greater.
5 0
3 years ago
In trying to understand the psychology of addiction, Dr. Jackson focuses on the neurochemical changes that occur, Dr. Fong focus
attashe74 [19]

Answer:

Psychology is theoretically diverse.

Explanation:

The theme, 'Psychology is theoretically diverse' means that the psychology has many various views and points. This is because when people make many observations they can go several and many different ways with these observations. This is why Psychology has many perspectives. The differing perspectives provide complete understanding of the human behavior more effectively.

Hence, different perspectives of the three professionals mentioned illustrate this theme.

8 0
4 years ago
An airplane flies with a velocity of 750. kilometers
viktelen [127]

Answer:

650 km/hr

Explanation:

Draw a right triangle from (0.0) (Point A) down 30 degrees and to the right for a length of 750 (Point B).  Then draw a line from B up to the x axis to make a right angle (Point C).  Use the cosine function to find line AC, the vector portion of AB that lies of the x (East) axis.  Cosine(30)= Adjacent/Hypotenuse.

Cos(30) = AC/750

750*(cos(30)) = AC

AC = 649.5 km/hr

5 0
3 years ago
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