1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ycow [4]
3 years ago
8

If a baseball has a zero velocity at some instant, is the acceleration of the baseball necessarily zero at that time? Explain -

making sure to give an example of an object that has a zero velocity but non-zero acceleration.
Physics
1 answer:
ipn [44]3 years ago
3 0

Answer:

No, not necessarily

Explanation:

If an object is moving with an acceleration that causes its speed to be reduced, there will be a moment in which it reaches v = 0, but this doesn't necessarily mean that the acceleration isn't acting anymore. If the object continues its movement with the same acceleration, it's velocity will become negative.

An example of an object that has zero velocity but non-zero acceleration:

If you throw an object in the air with a certain velocity, it will move vertically, reducing its velocity in a 9,8 m/s^{2} rate (which is the acceleration caused by gravity). At a certain point, the object will reach its maximum height, and will start to fall. In the exact moment that it reaches the maximum height, before it starts falling, its velocity is zero, but gravity is still acting on the object (this is the reason why it starts falling instead of just being stopped at that point). Therefore, at that point, the object has zero velocity but an acceleration of 9,8 m/s^{2}.

You might be interested in
A 1.1-cm-diameter pipe widens to 2.34 cm, then narrows to 4.9 mm. Liquid flows through the first segment at a speed of 3.57 m/s.
ratelena [41]

Answer:

v2=0.79 m/s

Explanation:

equation of continuity: V1A1=V2A2

A=(pi)r^2

A1=(pi)(0.55cm)^2

A2=(pi)(1.17cm)^2

convert cm2->m2

A1= 0.95cm2=

A2= 4.3cm2=

(3.57 m/s)(0.000095 m^2)=(x m/s)(0.00043 m^2)

v2=0.79 m/s

hope this helped

6 0
2 years ago
The distance between your school and house is 80 m. In going to your school starting from your
SIZIF [17.4K]

Answer:

a) 2/3 m/s

b) 0.0143 m/s

c) 0.00 m/s

Explanation:

a) 80 m / (2(60) s = 2/3 m/s

b) 2(80) / (3(3600) + (2 + 4)(60)) = 160 / 11,160 = 0.0143 m/s

c) start and end at your house. no displacement, no velocity.

8 0
2 years ago
The __________ is constructed of a large number of steel sheet metal panels that are precisely formed in presses and spot-welded
Alex73 [517]
Unibody Design is your answer. 
5 0
3 years ago
Read 2 more answers
Is drag a contact or non contact force
cestrela7 [59]
In my opinion i think it is a force because its showing frictional force consisting of two surfaces touching one another, in conclusion drag is a force
3 0
3 years ago
An electric iron is rated at 900 watts on a 120-volt circuit.
Ahat [919]

Answer:

I = 7.5 a

2 iron

Explanation:

P = VI

I = 900/120 = 7.5 A

Number of irons that can be used = 20/7.5= 2.66 that is 2 can be used

3 0
1 year ago
Other questions:
  • In a football game, a defensive lineman exerts a force upon an offensive lineman, causing the offensive lineman to be accelerate
    12·2 answers
  • A particular heat engine has a mechanical power output of 4.00 kW and an efficiency of 26.0%. The engine expels 8.55 103 J of ex
    11·1 answer
  • A roadway for stunt drivers is designed for racecars moving at a speed of 40 m/s. A curved section of the roadway is a circular
    6·1 answer
  • Edwin Hubble calculated the expansion rate of the universe. On what evidence did he base his calculation?
    13·2 answers
  • Insulating materials are rated by their _____. specific heat heat index r-value temperature resistance
    8·2 answers
  • If the car traveled 754 meters in a straight line between 0 and 36 seconds, what was the
    5·1 answer
  • Find the expression for pressure exerted by fluid with proper description​
    10·1 answer
  • Which quantity is the vector? <br> a) weight<br> b) power <br> c) kinetiic energy <br> d) speed
    9·1 answer
  • How does the distance traveled by the coin compare to its displacement after ten flips?
    5·1 answer
  • How does surface type affect speed?​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!