All categories

4 years ago

A regulation basketball has a 22 cm di-

Physics

1 answer:

Solnce55 [7]4 years ago

4 0

Answer:

0.70 s

Explanation:

Potential energy = kinetic energy + rotational energy

mgh = ½ mv² + ½ Iω²

For a thin spherical shell, I = ⅔ mr².

mgh = ½ mv² + ½ (⅔ mr²) ω²

mgh = ½ mv² + ⅓ mr²ω²

For rolling without slipping, v = ωr.

mgh = ½ mv² + ⅓ mv²

mgh = ⅚ mv²

gh = ⅚ v²

v = √(1.2gh)

v = √(1.2 × 9.81 m/s² × 1.1 m sin 49.0°)

v = 3.13 m/s

The acceleration down the incline is constant, so given:

Δx = 1.1 m

v₀ = 0 m/s

v = 3.13 m/s

Find: t

Δx = ½ (v + v₀) t

t = 2Δx / (v + v₀)

t = 2 (1.1 m) / (3.13 m/s + 0 m/s)

t = 0.704 s

Rounding to two significant figures, it takes 0.70 seconds.

You might be interested in

The moon has a smaller mass than the Earth. If

ArbitrLikvidat [17]

Answer:

Decrease

Explanation:

If you were on the Moon, which has significantly less mass than the Earth, your weight would: decrease

The point that seemed to be giving me a complicated time was being able to distinguish the difference and meaning of weight and mass and being able to apply that to a problem. I kept mixing up the definitions. For example in homework 3.1, one question asked:

If you were on the moon, which has significantly less mass than the earth, your mass would:

a. increase

b. decrease

c. stay the same

d. become zero

The definition of mass is the amount of matter in an object. The definition of weight is the amount or unit of force. For me, I just had to remember that when it asked about weight, it wasn’t referring how heavy an object is. After I was able to recognize that when it came to weight, questions became easier.

The final and correct answer was decreasing. The answer is because the Moon’s mass is less. This means the gravitational force is less on your body, therefore, your mass is going to be lighter

5 0

3 years ago

a particle is moving in a circle of radius R with constant speed.The time period of particle is T=1 second.In a time t=T/6,if th

12345 [234]

at t=T/6, total distance covered= 2*pi*r/6 and displacement= r

difference of them = 2*t
so, 2*pi*r/6- r =2(1/6)=1/3

r=1/(pi-3)=7.062

4 0

3 years ago

Read 2 more answers

The bogus pipeline is an instrument that was developed to measure attitudes that are otherwise difficult to measure because ____

VMariaS [17]

Answer:

of motivations to give a socially desirable response

Explanation:

The bogus pipeline is nothing but a polygraph machine which is fake.

With the help of a polygraph test it can be determined whether a person is telling the truth. This is done by measuring physiological indicators of a human being such as blood pressure, respiration, pulse, and skin conductivity.

The bogus pipeline appears to be like a real polygraph machine. It is assumed that people will be truthful as they believe that the machine is real. Nowadays, it is used to measure attitude towards a certain stimulus.

6 0

3 years ago

A car is traveling at 20 meters/second and is brought to rest by applying brakes over a period of 4 seconds. What is its average

frez [133]

(u) = 20 m/s
(v) = 0 m/s
 (t) = 4 s

0 = 20 + a(4)

4 x a = -20

so, the answer is -5 m/s^2. or -5 meter per second

8 0

4 years ago

Read 2 more answers

What is the purpose of family?

Marrrta [24]

Answer:

Purpose of family:

Basically main role of a family towards the society is its continuity by both reproduction and interaction with each other. The main contribution of family to the society is society's continuation.

Types of families:

The family further divided into six types nowadays. Namely,

Nuclear Family
Single Parent
Extended Family
Childless Family
Step family
Grandparent Family

Defining each Family and their pros and cons :

1). Nuclear Family: The most basic kind of family is nuclear family based on two parents and their biological or adopted children. Number of children is variable, some have one and others have more than one. The main aim of the nuclear family is to up bring their kids and teach them how to socialize in the society.

Pros of nuclear family:

Both parents work and more likely financially stable
Children gets more balanced parenting
Concerned about education
Focus more on health issues both mental and physical
More socialize in the society

Cons of nuclear family:

Higher level of stress factor due to increased number of dependents
Have higher rates of disputes
Children become egotistical due to over possessive parents

2). Single Parent: Consists of either a mother or a father living with one or more than one child. Parents may initially married, separated or departed, or passed away (one of them). Like other family structures single parents also have some pros and cons.

Pros of single parent:

Close relationship with each other due to less family members
More responsible as duties are not being further divided.
Both children and parents are strong and independent

Cons of single parent:

Less income due to sole parent
May relay on financial help
Quality living may compromise due to sole earning
Children become mentally unstable by living alternatively with parents (in divorced cases).

3). Extended Family: Basically extended families are joint families, in which grandparents, parents and children live together to support each other both financially and socially.

Pros of extended family:

More tolerance level among children
Care and Respects for people older in age is practiced
Have emotional support
Have social support

Cons of extended family:

Face more financial crises due to large number of members in a family
Intervening in personal matters with each other
Low privacy

4).Childless Family: Partners who have no any children either by choice or due to infertility.

Pros of childless family:

More financially strong
No one to take care of
More free to do basic thing like travelling, shopping and fun activities
Have more chance to fulfill desired goal

Cons of childless family:

Develop fear of isolation by the time
Society pressure (not having kids)
Develop sense of lacking something important (infertile couples)

5). Step family:

When two families start living to gather, like two divorced people get married and living together with their children (from 1st partner).

Pros of step family:

Child gets advantage by living with both parents
Financially stable due to two source of incomes

Cons of step family:

Feeling of living forcefully with second parent
Couple fight often due to each other's children conflict
children develop leas tolerance

6) Grandparent Family: In which grandchildren are raised by their grandparents.

Pros of grandparent family:

Children have strong relationship with their elderly
More protective environment for children

Cons of grandparent family:

Less financially table
Difficult to raise children due to old age and related health issue
Big age gap

Similarities and Differences:

By considering the pros and cons of different family structure we come to the point that many of them have some similarities like financial stability, strong bonding, and more socialization. Likewise there are few differences as well as some families share strong bond while other suffers from isolation. Some are more financially stable and others are less. Some have children while other are childless. Some children have both parents while other have single or step patent. Some of them have high tolerance while other has less. Some live quality life whiles other compromise on their needs and wants.

7 0

3 years ago