Answer:
The primary purpose in creating national parks is to protect the land from development and pollution.
Explanation:
National parks are owned by the national government. This areas are strictly reserved for habitat of wild animals.
The main purpose for creating national parks is to reserve some space for nature. This area is protected from pollution and development.
Thus, answer for given question is protect the land from development and pollution.
Space probes send information and pictures back to Earth using the Deep Space Network (DSN), a collection of big radio antennas. The antennas also receive details about where the spacecraft are and how they are doing. Whereas, an analog device transmits through electromagnetic waves and electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space. The natural space radiation environment can damage electronic devices so an analog device cannot be used. Hope this helps!
But they would be able to use analog devices in the future, if they create suitable protection for it.
Answer:
A = 0.02 m
Explanation:
The spring constant, k = 35.5 N/m
The attached mass, m = 5.50 kg
The expression for the external force, F = (4.40 N)sin[(6.80 s⁻¹)t].....(1)
The general expression for the external force, F = F₀ sin (wt).............(2)
Comparing equations (1) and (2):
The forced frequency, 
F₀ = 4.40 N
The natural frequency can be calculated using the formula:

The amplitude of oscillation of a spring-mass system in the steady state:

A book is pushed with an initial horizontal velocity of 5.0 meters per second off the top of a 1.19 meter high desk. The book lands at 2.45 m.
Answer: 2.45 m
<u>Explanation:</u>
The book when pushed with the initial velocity of 5 m/s, the book flights down from the high desk which is 1.19 m high. The book takes the projectile motion path and hence to calculate the distance, how far it lands away from the desk can be calculated as follows,
Given that,
v = 5 m/s
h = 1.19 m
As we know that the time can be calculated as the time of flight, by

Putting the values, we get,

Thereby,
