Physics, 23.10.2019 07:00, selldotjr

For a certain interval of time, an object is acted upon by a constant non-zero force. which of the following statements is true for this interval of time?

Answers: 3

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answered: jhjhgjvygv

Missing options:

a. The object is accelerating.

b. The object's velocity can only increase.

c. The object is at rest.

d. The object is moving with constant velocity.

e. The object's velocity changes.

a. The object is accelerating.

e. The object's velocity changes.

Explanation:

Let's answer by using Newton's second law:

F = ma

where

F is the net force on the object

m is the mass of the object

a is the acceleration

From the equation, we see that if the force on an object is non-zero, then the object is for sure accelerating, since is different from zero.

So, option A is correct.

Now, we also recall the definition of acceleration, which is the rate of change of velocity:

$a=\frac{\Delta v}{\Delta t}$

where $\Delta v$ is the change in velocity in the time interval $\Delta t$ . This can be rewritten as

$\Delta v = a \Delta t$

Here, since the acceleration is non-zero, it follows that also $\Delta v\neq 0$ : which means that the velocity of the object is changing.

So, option E is also correct.

The other options are wrong because:

b. The object's velocity can only increase. --> false, in fact acceleration can also be negative, and in that case the velocity would be decreasing

c. The object is at rest. --> false, since the velocity of the object is changing

d. The object is moving with constant velocity. --> false, since the velocity of the object is changing

answered: Guest

mistakes are ok

answered: Guest

An atom (ours, not carroll's) consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6 nm. * if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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For a certain interval of time, an object is acted upon by a constant non-zero force. which of the f...