Which of the following statements is true? A) An object that is accelerating is always changing direction.
B) An object at rest has an instantaneous acceleration of zero.
C) Instantaneous acceleration is always changing.
D) An object that is accelerating is always changing speed.

Answers

Answer 1

Answer:

Final answer:

Among the statements, B) An object at rest has an instantaneous acceleration of zero, is correct. This is because when an object is at rest, it isn't moving, and hence, no change in velocity and no acceleration. Other statements do not hold true in all cases.

Explanation:

The statement that is true among the options provided is B) An object at rest has an instantaneous acceleration of zero. When an object is at rest, it means it's not moving, and therefore, it doesn't have any acceleration. Acceleration is the rate at which an object changes its velocity. Thus, if an object is not moving, there is no change in velocity and hence, no acceleration. As for the other statements, A, C, and D, they do not hold true for all cases. An object can be accelerating while moving in a straight line (changing speed but not direction). Also, instantaneous acceleration isn't always changing - it can remain constant. Lastly, an object that is accelerating isn't always changing speed, as it could be moving in a circle at a constant speed.

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Answer 2

Answer:

Final answer:

The only fully accurate statement is that an object at rest has an instantaneous acceleration of zero, as no change in velocity indicates no acceleration. Other statements have instances where they might not always be true in the field of physics.

Explanation:

According to the fundamentals of Physics, only option B is fully correct: An object at rest has an instantaneous acceleration of zero. This is because an object at rest will stay at rest, with no change in velocity that would constitute acceleration.

Option A) is not entirely correct. An object that is accelerating may change direction, but not always. For example, a car can accelerate while driving straight.

Option C) is also not absolute. Instantaneous acceleration could be changing, but it could also be a constant rate if an object is moving with a uniform acceleration.

Finally, option D) is like A, is not always true: an object that is accelerating doesn't necessarily have to be changing speed. It could also be changing direction while maintaining the same speed.

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a car slows down from a speed of 25 m/s to rest in 5.0 seconds fine the acceleration during this time period

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The acceleration would be -5 m/s.

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Is there a multiple choice?

A golf ball reaches a height of 150 m before it stops rising and starts to fall to the ground. What is the golf balls speed (rounded to the nearest whole number) right before it hits the ground?

Answers

Answer:

v = 54 m/s

Explanation:

Given,

The maximum height of the flight of golf ball, h = 150 m

The velocity at height h, u = 0

The velocity of the golf ball right before it hits the ground, v = ?

Using the III equations of motion

v² = u² + 2gh

Substituting the given values in the above equation,

v² = 0 + 2 x 9.8 x 150 m

= 2940

v = 54 m/s

Hence, the speed of the golf ball right before it hits the ground, v = 54 m/s

The force of gravity down on the boy= 300NThe boy's weight down on the floor= 300N
The floor's reaction force back up on the boy= 300N

His WEIGHT IS EVENLY DISTRIBUTED OVER EACH FOOT
What is the net force on the boy?

Answers

The net force on the boy is zero.

Based on this analysis, I would expect the boy to not accelerate.

The net force of the boy is 300N=><=300N which equals a net force of 0N.

What is the meaning of heredity

Answers

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dayshawn is traveling at 12 m/s away from the school. dayshaun's mom is looking for him because he is late coming home so she left the house and is driving toward the school at 5 m/s. The school is 6492 m from dayshauns house. at what position will dayshawn meet his mom and how long after she left the house did she find dayshaun? draw a motion map and solve. show your work

Answers

Speed of Dayshawn travelling towards his home is 12 m/s

Speed of her mom towards his school is 5 m/s

They both starts at same time so whenever they will meet on their path the sum of the distance covered by Dayshawn and distance covered by his mom must be equal to the total distance of school and home

Now let say they both meet after "t" time when they starts motion

so we can write the total distance between school and home as

$d = v_1*t + v_2*t$