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allochka39001 [22]
4 years ago
15

What is the condition for an object experiencing free fall?

Physics
1 answer:
S_A_V [24]4 years ago
3 0

Answer:

The body acts under the influence of gravity.

Explanation:

An object experiencing free fall is acting under the influence of gravitational force and the acceleration due gravity is positive for any falling object. The body is able to fall freely due to the effect of gravity on it. This gravity effect causes the body to get attracted to the earth's gravitational surface due to gravitational pull exerted on the body.

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Two identical cars, one on the moon and one on earth, are rounding banked curves at the same speed with the same radius and the
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The quantity of heat from a chemical reaction comes from
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4 years ago
A 100.0 gram sample of Polonium-210 is contained for 552 days. How many half-lives occur during this period of time, if the half
Leto [7]

Answer:

4 half-lives will occur during this period of time.

Explanation:

Formula used :

a_o=a\times e^{-\lambda t}

\lambda =\frac{0.693}{t_{1/2}}

a=\frac{a_o}{2^n}

where,

a = amount of reactant left after n-half lives and time t

a_o = Initial amount of the reactant.

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t_{1\2} = half life of an isotope

n = number of half lives

We have :

a_o=100.0 g

a = ?

t = 552 days

t_{1/2}=138 days

a=100.0 g\times e^{-\frac{0.693}{138}\times 552}

a=6.254 g

6.254 g=\frac{100.0 g}{2^n}

2^n=\frac{100.0 g}{6.254 g}

n = 4

4 half-lives will occur during this period of time.

4 0
4 years ago
An astronaut tightens a bolt on a satellite in orbit. He rotates in a direction opposite to that of the bolt, and the satellite
statuscvo [17]

Answer: yes it can be prevented

Explanation:

The sensation of weightlessness that astronauts experience seems to make their tasks almost effortless. However, as Newton's third law of motion suggests, working in space can be physically demanding. 

As he tightens the bolt, he is rotating in the direction opposite to the bolt

It is possible if the handhold is designed in three dimensional motion where the astronaut motion will be the uplimb motion with the mass centre of hand move along circular helix trajectory

Angular momentum is conserved astronaut motion is conserved when net external torque is Zero.

4 0
4 years ago
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