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Makovka662 [10]
3 years ago
7

Which of the following examples accurately describes an object that is accelerating?

Physics
1 answer:
NemiM [27]3 years ago
3 0
"Acceleration" doesn't mean "speeding up".
It means ANY change in speed OR direction of motion.

A). The race car is moving at 150 mph.  Speed isn't changing, and we don't
know anything about its direction.  No evidence of acceleration there.

B).  A sailboat moves west, then north. 
It changed direction.  During the time that it was sailing
on a curve or around a corner, it was accelerating.

C).  A train half way between New York and Houston.
We don't know anything about its speed OR direction right now.
No evidence of acceleration there.

D).  A book sitting motionless.
Its speed is zero.  We know for a fact that its speed and direction
are not changing. So there is definitely no acceleration here.
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A 1 kg ball moving horizontally to the right at 3 m/s strikes a wall and rebound, moving horizontally to the left at the same ve
Airida [17]

Answer:

The magnitude of the change in linear momentum of the ball is 6 kg-m/s.

Explanation:

Given that,

Mass of the ball, m = 1 kg

Initial sped of the ball, u = 3 m/s

It strikes a wall and rebound, moving horizontally to the left at the same velocity of 3 m/s, v = -3 m/s

The magnitude of the change in linear momentum of the ball is given by :

p=m(v-u)\\\\p=1\ kg\times (-3-3)\\\\p=-6\ kg-m/s

So, the magnitude of the change in linear momentum of the ball is 6 kg-m/s.

3 0
4 years ago
Which of the following equations is dimensionally invalid
dedylja [7]
The answer should be A or D
7 0
3 years ago
Which statement best describes a commission system? A legislative body hires a leader to oversee city departments. An elected le
padilas [110]

Answer;

A legislative body oversees city departments directly.

Explanation;

City commission government is a form of local government in the United States. In a city commission government, voters elect a small commission, typically of five to seven members, on a plurality-at-large voting basis.

The commissioners constitute the legislative body of the city and, as a group, are responsible for taxation, appropriations, ordinances, and other general functions.

8 0
4 years ago
Read 2 more answers
A white dwarf has a greater mass than either a red dwarf or a brown dwarf. Yet a white dwarf has a smaller radius than either a
Sauron [17]

Explanation:

Red dwarf and brown dwarf masses are less than a typical white dwarf mass measuring around 1.2 solar masses. But it's only a few kilometers of the radius. This is precisely because there is no force to overcome the contraction due to gravity. There is a constant  battle between the external force of fusion (who wants to expand the star) and inward pressure because of gravity (who wants to compact the star) of regular stars on the main sequence. There remains a balance between these two forces as long as the star remains on the celestial equator.

Red dwarfs are helped by the nuclear fusion force, but brown dwarfs were not large enough to cause the fusion of hydrogen, they are massive enough to generate sufficient energy in the core by fusing deuterium to sustain their volume.  However as soon as the star runs out of hydrogen to burn it weakens the force of the external fusion and gravity starts to compact the center of the star. The contraction heats up the core into more massive stars and helium fusion begins, rendering the star once again stable. However this helium fusion does not occur in stars with masses below 1.44Mo. Tightness persists for such stars until the star's gasses degenerate.

8 0
4 years ago
What is the bicyclist's velocity at t=35s?
dlinn [17]
Since we are talking about the relation between the velocity and the time, the distance must be given.
Since no distance is given here, then I'll just tell you how to solve this question in terms of equations and you can substitute with the numbers you have.

The velocity can be calculated using the following rule:
velocity = distance / time
we are given the time as 3.5 seconds, therefore:
velocity = distance / 3.5
5 0
3 years ago
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