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
ss7ja [257]
3 years ago
7

A rubber ball is dropped and bounces vertically from a horizontal concrete floor. If the ball has a speed of 3 m/s just before s

triking the floor, and a speed of 6.5 m/s just after bouncing, find the average force of the floor on the ball. Assume that the ball is in contact with the floor for 0.32 s, and that the mass of the ball is 0.42 kg
Physics
1 answer:
Ganezh [65]3 years ago
6 0

Answer:

F=12.5N

Explanation:

Net force = rate of change of momentum

F = m*a

so find the change of momentum P

Pdown

P=m*v_1=0.42kg*3m/s

Pup

P=m*v_1=0.42kg*6.5m/s

dP = change in P

dP= 0.42kg (3- -.6.5)m/s =3.99 kg m/s

dT = 0.32 s

so

F = \frac{dP}{dt}=\frac{3.99Kg*m/s}{0.32s} =12.468 N

You might be interested in
A tuning fork labeled 392 Hz has the tip of each of its two prongsvibrating with an amplitude of 0.600mma) What is the maximum s
DanielleElmas [232]

a) 1.48 m/s

The tuning fork is moving by simple harmonic motion: so, the maximum speed of the tip of the prong is related to the frequency and the amplitude by

v_{max}=\omega A

where

v_{max} is the maximum speed

\omega is the angular frequency

A is the amplitude

For the tuning fork in the problem, we have

\omega=2\pi f=2 \pi(392 Hz)=2462 rad/s, where f is the frequency

A=0.600 mm=6\cdot 10^{-4} m is the amplitude

Therefore, the maximum speed is

v_{max}=(2462 rad/s)(6\cdot 10^{-4}m)=1.48 m/s

b)  3.0\cdot 10^{-5} J

The fly's maximum kinetic energy is given by

K=\frac{1}{2}mv_{max}^2

where

m=0.0270 g=2.7\cdot 10^{-5} kg is the mass of the fly

v_{max}=1.48 m/s is the maximum speed

Substituting into the equation, we find

K=\frac{1}{2}(2.7\cdot 10^{-5}kg)(1.48 m/s)^2=3.0\cdot 10^{-5} J

7 0
3 years ago
Water drips from a faucet at the rate of 150 drops in 120 seconds. What is the period?
user100 [1]

Answer:

.80

Explanation:

7 0
3 years ago
a. Find the magnitude of the gravitational force (in N) between a planet with mass 6.50 ✕ 1024 kg and its moon, with mass 2.45 ✕
Vanyuwa [196]

Answer:

a. 1.70\times 10^{20} N b. 6.94\times 10^{-3}m/s^2 c. 2.62\times 10^{-5} m/s^2

Explanation:

Use Gravitational Force:

F= G\frac{Mm}{r^2}

Use values given to have the results.

b.

g=\frac{F}{m}

Use m as the mass of the Moon. Using values of a. and m you have the answer.

c.

g = \frac{F}{M}

Use M mass of the planet. Use value of a and Mass of Planet.

3 0
3 years ago
Which model is the best example?  <br> (A, B, C, or D
tatiyna
C. is the correct answer

4 0
3 years ago
Read 2 more answers
Whenever a net force acts on an object, there is a change in the object's _______?
Ksenya-84 [330]
Whenever a net force acts on an object, it means object is under acceleration which implies that there is change in the object's velocity.
4 0
3 years ago
Other questions:
  • The image formed by a convex spherical mirror will always be
    6·2 answers
  • Which statement best defines a motor unit? A. a motor nerve and the muscle cells it stimulates B. a nerve supplying a muscle ori
    14·1 answer
  • During which segments is kinetic energy decreasing?<br> A)1,2,3<br> B) 4,5<br> C)1,3,5<br> D)2,4
    13·2 answers
  • In a uranium fission reaction, uranium splits into two smaller atoms and energy. Where did the energy come from?
    11·2 answers
  • A scale contains a spring with a spring constant of 291 N/m. Placing a mass on the scale causes the spring to be compressed by 2
    5·1 answer
  • EASY. PLEASE HELP. David is on a school bus stopped at a pick up point where students are getting on the bus. Once everyone is s
    15·1 answer
  • A cannon at rest fires a 32.5 kg cannonball forward at 388 m/s. After firing, the cannon recoils at 7.42 m/s. What is the mass o
    11·1 answer
  • How can I find the vertical velocity
    15·1 answer
  • 7. A student is rotating an object on a rope that is 4.5m long. If we increase the length
    5·1 answer
  • How much power will be required to force a current of 4.13 amps to flow through a conductor whose resistance is 113 ohms? Use tw
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!