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
djyliett [7]
3 years ago
8

A child bounces a 52 g superball on the sidewalk. The velocity change of the superball is from 20 m/s downward to 14 m/s upward.

If the contact time with the sidewalk is 1 800 s, what is the magnitude of the average force exerted on the superball by the sidewalk? Answer in units of N.
Physics
2 answers:
marusya05 [52]3 years ago
6 0

Answer:

Force on superball will be =9.8222\times 10^{-4}N

Explanation:

We have given mass of superball m = 52 gram = 0.052 kg

Velocity change from 20 m/sec downward to 14 m/sec upward

Let downward velocity is positive then upward velocity is negative

So downward velocity is + 20 m/sec and upward velocity is -14 m/sec

Time is given as 1800 sec

We know that acceleration is rate of change of velocity

So a=\frac{20-(-14)}{1800}=0.0188m/sec^2

According to newton second law

Force = ma = 0.052×0.0188 =9.8222\times 10^{-4}N

Svetlanka [38]3 years ago
6 0

Answer:

0.982 N

Explanation:

mass of ball, m = 52 g = 0.052 kg

initial velocity, u = - 20 m/s (downward)

final velocity, v = 14 m/s (upward)

time of contact, t = 1.8 s

According to Newton's second law, the rate of change of momentum of the body is equal to the forced exerted on that body.

initial momentum , pi  = mass x initial velocity = 0.052 x (-20) = - 1.04 kg m/s

final momentum, pf = mass x final velocity = 0.052 x 14 = 0.728 kg m/s

Change in momentum = final momentum - initial momentum

                                      = 0.728 - (- 1.04)= 1.768 kg m/s

So, force = change in momentum / time

Force = 1.768 / 1.8 = 0.982 N

You might be interested in
during a space shuttle launch about 830,000 kg of fuel is burned in 8 min. the fuel provides the shuttle with a constant thrust,
kirill115 [55]
The shuttles acceleration in the creases as the fuel is burned because the acceleration of the obect as produced by net force is directly proportional to the magnitude of the net force.
8 0
3 years ago
Which describes what an outside observer at rest would observe about a spaceship that speeds up and approaches the speed of ligh
Art [367]
The outside observer, at rest relative to the spaceship, would see the spaceship
get shorter. and the clocks on the spaceship run slower than they should.

At the same time, the crew of the spaceship, looking back at the observer on
Earth, would see the observer on Earth get shorter, and the observer's clock
run slower than it should.

They would both be measuring what they see correctly.
6 0
3 years ago
Read 2 more answers
You ran a power plant what could you do to make this generator produce electricity
DIA [1.3K]
You could use a magnetic generator or you could use hydraulic power
8 0
3 years ago
6. A 4 kg object hangs below a 6 kg object by a string of negligible mass. If the 6 kg object is pulled upward by a force of 440
MrRissso [65]

Answer:

T =176 N

Explanation:

from diagram

F -(m_1+m_2_g) = (m_1+m_2_g)a

440 - (6+4)g = (6+4)a

a =\frac{440-10*9.8}{10}

a =34.2 m/s^2

frrom free body diagram of mass m2 = 4kg

T -m_2g =m_2a

T = m_2(g +a)

T = 4(9.81+34.2)

T =176 N

7 0
3 years ago
Explain that a universe is a large collection of billions of galaxies and is expanding continuously?
pychu [463]
It is the effect of the Big Bang and dark energy.
4 0
3 years ago
Read 2 more answers
Other questions:
  • A single slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum, when monochromatic
    8·1 answer
  • If we relied solely on the nonrenewable resources found in the U.S., which one would we run out of first at current usage levels
    5·2 answers
  • A Carnot heat engine uses a hot reservoir consisting of a large amount of boiling water and a cold reservoir consisting of a lar
    11·2 answers
  • When asked how to create an electromagnet, the best answer would be:
    6·1 answer
  • A bodybuilder loads a bar with 550 Newton’s (125 pounds) of weight and pushes the bar over her head 10 times. Each time she lift
    12·1 answer
  • A 0.0233-kg bullet is fired horizontally into a 2.41-kg wooden block attached to one end of a massless, horizontal spring (k = 8
    9·1 answer
  • Two large parallel conducting plates are 8.0 cm apart and carry equal but opposite charges on their facing surfaces. The magnitu
    13·1 answer
  • You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7J
    10·1 answer
  • A moving man is lifting a box up an inclined plane. Halfway up he sets the box down and rests. Which of the following explains w
    5·1 answer
  • What is a negative effect of increased carbon dioxide within the carbon cycle?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!