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zloy xaker [14]
3 years ago
9

If the acceleration of an object is negative, the object must be slowing down. true or false

Physics
1 answer:
mrs_skeptik [129]3 years ago
5 0
True, because when you are slowing down you LOSE speed.

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Why do you have to use a referance point to determine whether or not an object is in motion
SOVA2 [1]
Because there's no such thing as "really" moving.  
ALL motion is always relative to something.

Here's an example:
You're sitting in a comfy cushy seat, reading a book and listening 
to your .mp3 player, and you're getting drowsy.  It's so warm and 
comfortable, your eyes are getting so heavy, finally the book slips 
out of your hand, falls into your lap, and you are fast asleep.

-- Relative to you, the book is not moving at all.
-- Relative to the seat, you are not moving at all.
-- Relative to the wall and the window, the seat is not moving at all. 
-- But your seat is in a passenger airliner.  Relative to people on the 
    ground, you are moving past them at almost 500 miles per hour !
-- Relative to the center of the Earth, the people on the ground are moving
   in a circle at more than 700 miles per hour.   
-- Relative to the center of the Sun, the Earth and everything on it are moving
   in a circle at about 66,700 miles per hour !  

How fast are they REALLY moving ?
There's no such thing.
It all depends on what reference you're using. 
4 0
3 years ago
Read 2 more answers
Can someone help me with these ​
Lostsunrise [7]

Answer:

what is this question

Explanation:

sorry sorry

8 0
3 years ago
List the characteristics properties of all waves. at what speed do electromagnetic waves travel in a vacuum
ad-work [718]
All electromagnetic waves travel at

299,792,458 meters per second

in vacuum.
7 0
4 years ago
What is surface tension of water?<br><br> Please help!
kondaur [170]
Surface tension could be defined as the property of the surface of a liquid that allows it to resist an external force. The cohesive forces among liquid molecules are responsible for the phenomenon.

In simpler terms, it is the force that causes the molecules on the surface of a liquid to be pushed together and form a layer. The surface tension, then, is a measure of the cohesive forces that hold the molecules together.

Getting the actual measurement would give us 72 dynes/cm at 25°C . However, the force decreases significantly depending on the temperature.
5 0
4 years ago
The tires of a car make 60 revolutions as the car reduces its speed uniformly from 95.0 km/h to 60.0 km/h. The tires have a diam
yawa3891 [41]

Answer:

-2.869 rad/s2

Explanation:

Data given:

speed, vi at 95.0 km/h = 95 X (1 hour /3600 seconds) X (1000m / 1km)

Note that, for every 1 hour, there will be 60sec X 60sec = 3600 seconds

And for every 1km, there will be 1000m.

So, speed of 95.0 km/h = 26.389 m/s

speed, vi  =  r ω (radius X angular velocity)

 angular velocity, ωi = v/r

ωi = 26.389  m/s ÷ half of 0.88 m diameter

= 59.975 rad/s

decelerating to speed, vf at 60.0 km/h = 60 X X (1 hour /3600 seconds) X (1000m / 1km)

= 16.667m/s

The angular velocity for this speed = 16.667m/s ÷ half of 0.88 m diameter

 = 37.879rad/s

 How far the car goes is equivalent to the angular acceleration which equals to (ωf^2 - ωi^2) ÷ 2θ

= (37.879rad/s)^2 - (59.975 rad/s)^2 ÷ 2 (60 rev X 2π rad/rev)

= -2.869 rad/s2

4 0
3 years ago
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