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
denis-greek [22]
3 years ago
9

A object of mass 33 is dropped from a height of 85 meters. Calculate the average power developed by the object in falling throug

h this distance.
Take g as 9.81 m/s^2

give the answer in watts to three significant figures
Physics
1 answer:
DochEvi [55]3 years ago
3 0
Power  =  Work done  /  Time taken.

Work done =  mgh
Mass, m = 33kg    ( Am presuming it is 33 kg).
h =  85 m.
Work done =  33 * 9.81* 85 =  27517.05  J.

Time taken.
Since object was dropped from height, it fell under gravity.
Using    H =  ut  +  (1/2) * gt^2.              u = 0.
               H =  1/2 gt^2.
               t  =   (2H/g) ^ (1/2)
               t  =  (2*85/9.81) ^ 0.5 =  4.1628 s.

Power  =    27517.05 / 4.1628 = 6610.23 Watts.
             =  6610 W  to  3 S. f.

You might be interested in
Carbon-14 is a naturally-occuring, stable isotope that is commonly used is scientific studies as a tracer and to date artifacts.
lina2011 [118]
The answer is that there are 6 electrons, 8 neutrons, and 6 protons in carbon 14. The answer is then, B.
3 0
3 years ago
Read 2 more answers
An ideal Diesel cycle has a compression ratio of 18 and a cutoff ratio of 1.5. Determine the (1) maximum air temperature and (2)
weqwewe [10]

Answer:

(1) The maximum air temperature is 1383.002 K

(2) The rate of heat addition is 215.5 kW

Explanation:

T₁ = 17 + 273.15 = 290.15

\frac{T_2}{T_1} =r_v^{k - 1} =18^{0.4} =3.17767

T₂ = 290.15 × 3.17767 = 922.00139

\frac{T_3}{T_2} =\frac{v_3}{v_2} = r_c = 1.5

Therefore,

T₃ = T₂×1.5 = 922.00139 × 1.5 = 1383.002 K

The maximum air temperature = T₃ = 1383.002 K

(2)

\frac{v_4}{v_3} =\frac{v_4}{v_2} \times \frac{v_2}{v_3}  = \frac{v_1}{v_2} \times \frac{v_2}{v_3} = 18 \times \frac{1}{1.5} = 12

\frac{T_3}{T_4} =(\frac{v_4}{v_3} )^{k-1} = 12^{0.4} = 2.702

Therefore;

T_4 = \frac{1383.002}{2.702} =511.859 \ k

Q_1 = c_p(T_3-T_2)

Q₁ = 1.005(1383.002 - 922.00139) = 463.306 kJ/jg

Heat rejected per kilogram is given by the following relation;

c_v(T_4-T_1)  = 0.718×(511.859 - 290.15) = 159.187 kJ/kg

The efficiency is given by the following relation;

\eta = 1-\frac{\beta ^{k}-1}{\left (\beta -1  \right )r_{v}^{k-1}}

Where:

β = Cut off ratio

Plugging in the values, we get;

\eta = 1-\frac{1.5 ^{1.4}-1}{\left (1.5 -1  \right )18^{1.4-1}}= 0.5191

Therefore;

\eta = \frac{\sum Q}{Q_1}

\therefore 0.5191 = \frac{150}{Q_1}

Heat supplied = \frac{150}{0.5191}  = 288.978 \ hp

Therefore, heat supplied = 215491.064 W

Heat supplied ≈ 215.5 kW

The rate of heat addition = 215.5 kW.

7 0
3 years ago
The function h(t) = 162 +64t models the height, in feet, of a ball t seconds after it was kicked into the air. Which statement i
melamori03 [73]

Answer:

the ball didn't not reach the Maximum height because of the time interval

3 0
3 years ago
Student bikes to school by traveling first dN = 1.10 miles north, then dW = 0.300 miles west, and finally dS = 0.200 miles south
melisa1 [442]
Taking the vertical component of the displacement
1.1 - 0.2 = 0.9 mile
The horizontal component of the displacement
-0.3 mile

The magnitude of the displacement is
√[ (0.9)² + (-0.3) ] = 0.95 mile

The direction is
θ = tan-1 (-0.3/0.9)
θ = 161.57 degrees.
8 0
3 years ago
I need a diagram for how a scrap heap magnet works
cupoosta [38]
Will this one work?...................

5 0
3 years ago
Other questions:
  • PLEASE THINK ABOUT THIS AND EXPLAIN FULLY :)
    5·1 answer
  • how do you find the uncertainty of a single measurement? For example, I am trying to find the uncertainty of 26 grams. ​
    7·1 answer
  • A guitar string is fixed at both ends. If you tighten it to increase its tension, the frequencies of its normal modes will incre
    15·1 answer
  • Define the phenomena​
    6·2 answers
  • This is responsible for making macaroni rise and fall in a pot on the stove.
    12·1 answer
  • Which type of light ray can produce identical but reversed
    10·2 answers
  • Givereasons for the following.
    13·1 answer
  • What is the acceleration of an athlete who speeds up from 2 m/s to 9 m/s in 5 seconds
    9·1 answer
  • Which of the following changes would not lead to changes in the efficiency of
    7·1 answer
  • A sample from a meteorite that landed on Earth has been analyzed, and the result shows that out of every 1,000 nuclei of potassi
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!