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
Digiron [165]
3 years ago
13

Two people are standing on a 2.50-m-long platform, one at each end. The platform floats parallel to the ground on a cushion of a

ir, like a hovercraft. The two people, the platform and a 3.63-kg ball are all initially at rest. One person throws the 3.63-kg ball to the other, who catches it. The ball travels nearly horizontally. Excluding the ball, the total mass of the platform and people is 198 kg. Because of the throw, this 198-kg mass recoils. How far does the platform move before coming to rest again?
Physics
1 answer:
trasher [3.6K]3 years ago
6 0

Answer:

The platform move before coming to rest again 0.045 m far

Explanation:

Given

Ball is in motion

M (Platform mass + 2 people mass)

V (recoil velocity of the platform)

m (ball mass)

v (velocity ball)

MV + mv = 0

Distance of the platform movement is

t (time that the ball is in the air)

x = Vt

t = \frac{L}{v - V}

Knowing the platform and the ball are moving while the ball is in the air

x = \frac{V}{v - V} * L

Also knowing that

\frac{V}{v} = \frac{-m}{M}

This way,

x = ((\frac{V}{v}) * L) / (1 - \frac{V}{v}) = -\frac{m*L}{M + m} = -\frac{3.63 kg * 2.50 m}{198 kg + 3.63 kg}  = -0.045 m

The minus sign means the displacement of the platform is in opposite direction to the displacement of the ball.

You might be interested in
How does a nuclear power plant produce energy
nalin [4]
The steam then turns turbines to produce<span> electricity. The difference is that </span>nuclear plants do<span> not burn anything. Instead, they use uranium fuel, consisting of solid ceramic pellets, to </span>produce<span> electricity through a process called fission. best i can do hope it helps</span>
8 0
3 years ago
I would love to stretch a wire from our house to the Shop so I can 'call' my husband in for meals. The wire could be tightened t
dezoksy [38]
Note: I'm not sure what do you mean by "weight 0.05 kg/L". I assume it means the mass per unit of length, so it should be "0.05 kg/m".

Solution:
The fundamental frequency in a standing wave is given by
f= \frac{1}{2L} \sqrt{ \frac{T}{m/L} }
where L is the length of the string, T the tension and m its mass. If  we plug the data of the problem into the equation, we find
f= \frac{1}{2 \cdot 24 m} \sqrt{ \frac{240 N}{0.05 kg/m} }=1.44 Hz

The wavelength of the standing wave is instead twice the length of the string:
\lambda=2 L= 2 \cdot 24 m=48 m

So the speed of the wave is
v=\lambda f = (48 m)(1.44 Hz)=69.1 m/s

And the time the pulse takes to reach the shop is the distance covered divided by the speed:
t= \frac{L}{v}= \frac{24 m}{69.1 m/s}=0.35 s
7 0
3 years ago
Why are atoms in a covalent bond usually a certain distance away from each other?
ANTONII [103]
I think it is because the electrons repel each other

4 0
3 years ago
Is there any difference between reflection and echo???
Fofino [41]

Answer:

reflection is the act of reflecting or the state of being reflected while echo is

reflection of sound waves from a surface back to the initial listener

6 0
3 years ago
What is the effect of_on_?
evablogger [386]

skin cancer and it cause to lost transportating process

6 0
3 years ago
Other questions:
  • Anthony is standing on the top of a building 10 m high holding a 7 kg bowling ball. Mildred dug a 2-m-deep hole next to the base
    7·1 answer
  • Which option gives an object mass in SI units
    8·1 answer
  • If a spring has a spring constant of 2 N/m and it is stretched 5 cm, what is the force of the spring?
    6·1 answer
  • The differences between models and scientific laws and theories.
    11·1 answer
  • Diagram B D c с Which car has: Ke = 100 PE=0? * 1 point A B C D​
    12·1 answer
  • Charge A and charge B are 2.2 m apart. Charge A is 1.0 C, and charge B is
    8·1 answer
  • URGENT! 40 POINTS! For each situation below, find the work done on the box using both energy and forces.
    10·1 answer
  • Please guys i need help in this
    13·1 answer
  • A box of mass 3.6 kg is lifted 5.4 m above the
    11·1 answer
  • Identify the processes that are necessary for continued growth and division in a normal body cell
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!