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
amm1812
3 years ago
13

Two students are relaxing in their dorm room and are too lazy to get up and shut the door. One of the students suggests throwing

something at the door but there are only two things close at hand:
1) A hard baseball of mass m
2) A soft sticky ball of clay, also of mass m
If the baseball bounces off the door and the clay ball sticks to the door, which collision will cause the door to shut fastest?
Physics
2 answers:
Anna11 [10]3 years ago
8 0

Answer:

The collision of the hard baseball that bounces back will shut the door fastest.

Explanation:

Let the mass of the door be M

The mass of the hard baseball and soft clay Is m

Let the initial velocity of both the hard baseball and the soft clay be v₀

Let the Final velocity of the hard baseball be v₁

Then let the final velocity of the door be v

Using the law of conservation of Momentum,

Momentum before collision = Momentum after collision

For the hard baseball system

Momentum before collision = (m)(v₀) + (M)(0) = mv₀ (the initial velocity of the door is 0 m/s since it is at rest)

Momentum after collision = (m)(-v₁) + (M)(v)

= (-mv₁ + Mv) (the velocity of the hard baseball after collision has a minus sign because it is in the opposite direction to the initial velocity)

mv₀ = (-mv₁ + Mv)

Mv = mv₀ + mv₁ = m(v₀ + v₁)

v = m(v₀ + v₁)/M

For the soft clay,

Momentum before collision = (m)(v₀) + (M)(0) = mv₀

Momentum after collision = (m + M)(v)

mv₀ = (m + M) v

v = mv₀/(m + M)

Comparing these two answers for the velocity of the door after collision

With hard baseball that bounces back

v = m(v₀ + v₁)/M

With soft clay that sticks to the door

v = mv₀/(m + M)

v for hard baseball has a bigger numerator and a smaller denominator, hence, it has the higher value and this means the door will close faster with a numerically higher final velocity from the elastic collision of the hard baseball with the door.

Hope this Helps!!!

Vlada [557]3 years ago
6 0

Answer:

The soft sticky ball

Explanation:

The collision produced by the soft ball is much more inelastic that the other one (with the hard baseball), hence, the soft ball will give almost all its energy to the door, and in fact, almost all its momentum. This will produce that the door gains more energy and it will shut faster. The collision with the hard baseball is more an elasctic collision and only for a moment the hard baseball will give part of its momentum to the door, ant it is not enough.

You might be interested in
What is the magnitude (size) and direction of the cumulative force acting on the car shown in the picture above?
mrs_skeptik [129]

Answer:

5070

Explanation:

add them up and then you get <em>your</em><em> </em><em>answers</em><em> </em>

5 0
3 years ago
Read 2 more answers
Three identical resistors have an equivalent resistance 15.6 ohm when they are connected in series. What is the resistance for e
attashe74 [19]

Answer:

R=5.2\ \Omega

Explanation:

In series combination, the equivalent resistance is given by :

R_{eq}=R_1+R_2+R_3+...

Let the identical resistors be R. We have, R_{eq}=15.6\ \Omega

So,

R+R+R=15.6\\\\3R=15.6\\\\R=\dfrac{15.6}{3}\\\\R=5.2\ \Omega

So, the resistance of each resistor is 5.2\ \Omega.

4 0
2 years ago
WILL GIVE THE BRAINLIEST!!!
True [87]

Answer:

E

Explanation:

The police car is going to fast for the cop to hear and the same is with the speeder its who hears its highest pitch because it drives right past you and your not moving just standing on the cross walk

6 0
3 years ago
Read 2 more answers
Suppose the electric field between two parallel plates kept constant but the distance between them is tripled. What happens to t
alukav5142 [94]

Answer:

The voltage increases by a factor of three.

Explanation:

7 0
3 years ago
If a car has a mass of 400 kg and a velocity of 30 m/s to the east, what is the magnitude of its momentum?
Svet_ta [14]
Momentum=mass*velocity
=400kg*30m/s
=12000kg m/s
8 0
3 years ago
Read 2 more answers
Other questions:
  • Helpppp!!!
    9·1 answer
  • You're driving down the highway late one night at 22 m/s when a deer steps onto the road 38 m in front of you. Your reaction tim
    13·1 answer
  • What is the pressure amplitude for the threshold of human hearing?
    5·2 answers
  • Why are galaxies visible
    10·1 answer
  • A proton is going 2,000 m/s into a magnetic field of 300 T. How much force does it feel. The charge of a proton = 1.602 x 10^-19
    15·1 answer
  • A child pushes a 100 kg refrigerator with a force of 50 N, but the refrigerator does not move. Suppose the coefficient of static
    12·1 answer
  • A typical donation of whole blood is equal to a pint (473 ml). If the average density of blood rhoBLOOD = 1060 kg/m^3, what is t
    9·1 answer
  • (PLEASE HELP ILL GIVE OUT BRAINLIEST) Mr. Hicks stands on top of the roof and drops water ball oons at passing students. He miss
    15·2 answers
  • What is the SI (metric) unit of FORCE?<br><br> A. meter<br> B. newton
    7·2 answers
  • List three examples of real science that you find on the internet or in real life
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!