Question
In: Physics
A weightlifter works out at the gym each day. Part of her routine is to lie...
A weightlifter works out at the gym each day. Part of her routine is to lie on her back and lift a 41 kg barbell straight up from chest height to full arm extension, a distance of 0.55 m .
1. How much work does the weightlifter do to lift the barbell one time?
2. If the weightlifter does 25 repetitions a day, what total energy does she expend on lifting, assuming a typical efficiency for energy use by the body (25%).
3. How many 430 Calorie donuts can she eat a day to supply that energy? Express your answer using two significant figures.
Solutions
Expert Solution
Solution:-
A weightlifter works out at the gym each day, part of her routine is to lie on her back and lift a 41kg barbell straight up from chest height and to full arm extension a distance of 0.55m
- ) Calculate work does the weightlifter do to lift the barbell one time
Work = force * distance
Weight = 41*9.8
Work = 41*9.8*0.55
Work = 220.99N-m
Work = 221 J
2) If the weightlifter does 25 repetitions a day , calculate total energy,
Work = Energy
Energy = (220.99J/rep)*(25rep)
Energy = 5524.75
Energy = 5525J if 100% efficiency
Since she is only 25% effiecincy she has to expend
4*5524.75J
= 22099 J
22099J of energy to do 5524.75 J of work.
3) How many 430 calories donuts can she eat a day to supply that energy
4.18J = 1 Calorie
22099/4.18 = 5286.84calories/430donuts = 12.29 donuts
12 donuts (two significant figures)
genius_generous answered 1 year agoRelated Solutions
Janet is 22, and college student that recently moved out onto her own. She works part...
Janet is 22, and college student that recently moved out onto
her own. She works part time and pays all her own bills. She has
been vegan for about 8 months, and likes to go jogging 2-3 times
per week. Because of limited finances, she often eats ramen,
apples, carrots, whatever bread or pasta is on sale. She avoids
going out to eat, and mostly packs her own lunch. She doesn’t
usually eat breakfast, and often forgets to drink water...
(a) Susan tries to exercise at ”Pure Fit” Gym each day of the week, except on...
(a) Susan tries to exercise at ”Pure Fit” Gym each day
of the week, except on the weekends
(Saturdays and Sundays). Susan is able to exercise, on average, on
75% of the weekdays
(Monday to Friday).
i. Find the expected value and the standard deviation of the number
of days she
exercises in a given week. [2 marks]
ii. Given that Susan exercises on Monday, find the probability that
she will exercise at
least 3 days in the rest of...
. (a) Susan tries to exercise at ”Pure Fit” Gym each day of the week, except...
. (a) Susan tries to exercise at ”Pure Fit” Gym each day of the
week, except on the weekends (Saturdays and Sundays). Susan is able
to exercise, on average, on 75% of the weekdays (Monday to Friday).
i. Find the expected value and the standard deviation of the number
of days she exercises in a given week. [2 marks] ii. Given that
Susan exercises on Monday, find the probability that she will
exercise at least 3 days in the rest...
(a) Susan tries to exercise at ”Pure Fit” Gym each day of the week, except on...
(a)
Susan tries to exercise at ”Pure Fit” Gym each day of the week,
except on the weekends (Saturdays and Sundays). Susan is able to
exercise, on average, on 75% of the weekdays (Monday to
Friday).
Find the expected value and the standard deviation of the number
of days she exercises in a given week. [2 marks]
Given that Susan exercises on Monday, find the probability that
she will exercise at least 3 days in the rest of the week....
Joe, a 27-year-old white male teacher who works out daily at the gym, begins to complain...
Joe, a 27-year-old white male teacher who works out daily at the
gym, begins to complain of a headache and feeling like he is coming
down with the flu. The school nurse advises him to go home; rest;
take ibuprofen for fever and achiness, antihistamines if needed;
and to drink plenty of fluids. Joe goes home and follows the
nurse’s advice. After awakening from a nap, he has a fever of 101°F
orally and is complaining of a headache, nausea,...
Alice works for Citadel, and her day-to-day job involves deciding and updating bid and ask prices...
Alice works for Citadel, and her day-to-day job involves
deciding and updating bid and ask prices for a particular stock
which is trading in NYSE, based on her own petition in that stock.
That makes Alice a:
1. Principle
2.Floor Broker
3.Supplemental Liquidity Provider
4.Capitalist
5.Market maker.
Students in a gym class have a choice of swimming or playing basketball each day. Thirty...
Students in a gym class have a choice of swimming or playing
basketball each day. Thirty percent of the students who swim one
day will swim the next day. Sixty percent of the students who play
basketball one day will play basketball the next day. Today, 100
students swam and 200 students played basketball. How many students
will swim tomorrow, in two days, and in four days? (Round your
answers to the nearest whole number.)
(a) tomorrow: _____students
(b) two...
4. (a) Susan tries to exercise at "Pure Fit" Gym each day of the week, except...
4. (a) Susan tries to exercise at "Pure Fit" Gym each day of the
week, except on the weekends.(Saturdays and Sundays). Susan is able
to exercise, on average, on 75% of the weekdays.(Monday to
Friday).
i. Find the expected value and the standard deviation of the
number of days she
exercises in a given week.
ii. Given that Susan exercises on Monday, _nd the probability
that she will exercise at
least 3 days in the rest of the week.
iii....
4 (a) Susan tries to exercise at ”Pure Fit” Gym each day of the week, except...
4 (a) Susan tries to exercise at ”Pure Fit” Gym each day of the
week, except on the weekends (Saturdays and Sundays). Susan is able
to exercise, on average, on 75% of the weekdays (Monday to
Friday).
Find the expected value and the standard deviation of the
number of days she exercises in a given week. [2
marks]
Given that Susan exercises on Monday, find the probability that
she will exercise at least 3 days in the rest of the...
4. (a) Susan tries to exercise at ”Pure Fit” Gym each day of the week, except...
4. (a) Susan tries to exercise at ”Pure Fit” Gym each day of the
week, except on the weekends (Saturdays and Sundays). Susan is able
to exercise, on average, on 75% of the weekdays (Monday to
Friday).
Find the expected value and the standard deviation of the
number of days she exercises in a given week. [2
marks]
Given that Susan exercises on Monday, find the probability that
she will exercise at least 3 days in the rest of the...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Consider a buffer system consisting of Benzoic acid (pKa = 4.20) and sodium benzoate, a) Would...
- Decision Variables S T Minimize 1.8S + 2.20T Subject to: Potassium 5S + 8T >= 200...
- A neurologist needs to counsel a stroke victim and her husband about possible outcomes, treatment options,...
- Case Study: Personal Beliefs in the Workplace Don Shakow was a prominent professional who worked in...
- 1: Competency framework usage is the modern best practice in management. What is meant by competency...
- A 19.34 g mixture of sugar (C12H22O11) and table salt (NaCl) is dissolved in 231 g...
- Young and Company claims that its pressurized diving bell will, on average, maintain its integrity to...
ADVERTISEMENT