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SashulF [63]
3 years ago
5

Describing Free Fall What is the only force that acts on a falling body when it is in free fall?

Physics
2 answers:
GrogVix [38]3 years ago
6 0
"Free Fall" MEANS that the only force acting on the object is
the force of gravity.  It may be falling, but if there's any other
force acting on it besides gravity, like maybe air resistance,
then it's NOT in "free fall".
Levart [38]3 years ago
4 0

Answer:

gravity

Explanation:

on edg. 2020

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An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 5.00 m/s from a height of 1.60 m above
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Answer:

a) No

b) the rock must have a minimum initial speed of 6.79m/s for it to reach the top of the building.

Explanation:

Given:

Height of the wall = 3.95m

Initial height = 1.60m

Initial speed = 5.00m/s

distance between the initial height and wall top = 3.95 - 1.60 = 2.35m

Using the formula;

v^2 = u^2 + 2as ....1

Where v = final velocity, u = initial velocity, a = acceleration, s = distance travelled

From equation 1

s = (v^2 - u^2)/2a ...2

Since the rock t moving up,

the acceleration = -g = -9.8m/s2

s = maximum height travelled

v = 0 (at maximum height velocity is zero)

Substituting into equation 2

s = (0 - 5^2)/(2×-9.8) = 1.28m

Therefore, the maximum height is 1.28 from his initial height Which is less than the 2.35m of the wall from his initial height. So the rock will not reach the top of the wall

b) Using equation 1:

u^2 = v^2 - 2as

v = 0

a = -9.8m/s

s = 2.35m. (distance between the initial height and wall top)

u^2 = 0 - 2(-9.8 × 2.35)

u^2 = 46.06

u = √46.06

u = 6.79m/s

Therefore, the rock must have a minimum initial speed of 6.79m/s

8 0
3 years ago
Are There some sounds for which we are all deaf
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Answer: Infrasound is the span of low-frequency sounds below 20 Hz that fall below the hearing range of humans. While these sounds escape our ears, scientific instruments can detect them—and tell us some interesting things about the planet.

Explanation:

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yaroslaw [1]

Answer:

Explanation:

r = 60 mph

d = 100 miles

t = ?

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t = 1 2/3 hour or 1 hour and 40 minutes.

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Marrrta [24]

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Explanation:

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