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
Furkat [3]
3 years ago
7

Power lifter Paul lifts a 700.0kg barbell 2.00m in 0.400s. How much power did Paul develop?

Physics
2 answers:
Vsevolod [243]3 years ago
6 0

         Work = (force) x (distance.

The force required to lift the load is its weight.

         Weight = (mass) x (gravity)

so    Work = (mass) x (gravity) x (distance)

Now  Power = (work) / (time)

so     Power  =  (mass) x (gravity) x (distance) / (time)

                      =  (700kg) x (9.8 m/s²) x (2 m)  /  (0.4 sec)

                      =  ( 700 x 9.8 x 2) / (0.4)  (kg-m²/sec²) / (sec)

                      =        ( 34,300 )                  (joule)  /  (sec)

                      =                     34,300 watts .

This is one of those exercises where the math and the physics
are air-tight and bullet-proof but the answer is absurd.

34,300 watts is about 46 horsepower.  I don't care how many
Wheaties Power Lifter Paul had for breakfast today, he is NOT
snatching a barbell that weighs  1,543 pounds (0.77 ton !)
to the height of the top of his head in less than 1/2 second !
yawa3891 [41]3 years ago
3 0
34,335 W 
P= mgh/t 
P=700*2*9.81/.4

You might be interested in
The kicker now kicks the ball with the same speed as in the number of 4,but at 60.0°from the horizontal or 30.0° from the vertic
Shkiper50 [21]

Answer:

i) 0.7

ii) 1.39

iii) 0.6

Next time, when compiling a Physics question, ensure you put the unit of each measurement.

Explanation:

i) T = time of flight =   \frac{2uSin(A)}{g}

where u = speed = 4, A = 60 and  g = acceleration due to gravity = 10 (It is a constant);

Subsituting the values, we have: T = \frac{2(4)Sin(60)}{10} = 0.7

ii) distance travel = Range =  R = \frac{u^{2}Sin(2A) }{g}

where u = speed = 4, A = 60 and  g = acceleration due to gravity = 10 (It is a constant);

Subsituting values, we have: R = \frac{4^{2}Sin(2*60) }{10} = 1.39

iii) Maximum Height = H = \frac{u^{2}(Sin(A))^{2}  }{2g}

where u = speed = 4, A = 60 and  g = acceleration due to gravity = 10 (It is a constant);

Subsituting values, we have: \frac{4^{2}(Sin60)^{2}  }{2*10} = 0.6

4 0
2 years ago
A liquid thermometer can be used to test for fevers. When body temperature increases, the liquid inside the thermometer expands
kompoz [17]

Answer:

A

Explanation:

dafdfsfsf

4 0
3 years ago
What is the force of gravity between two 50.0kg masses that are separated by 0.300m?3.71x10-8N5.59x10-7N2.78x104N1.85x10-6N
Varvara68 [4.7K]

We will have the following:

\begin{gathered} F=G\frac{m_1m_2}{r^2}\Rightarrow F=\frac{(6.67\ast10^{-11}m^3\ast kg^{-1}\ast s^{-2})(50kg)(50kg)}{(0.3m)^2} \\  \\ \Rightarrow F=1.852777778...\ast10^{-6}N\Rightarrow F\approx1.85\ast10^{-6}N \end{gathered}

So, the force is approximately 1.85*10^-6 N.

7 0
10 months ago
A 6.00-kg box is sliding to the right across the horizontal floor of an elevator. The coefficient of kinetic friction between th
kap26 [50]

Answer: Kinetic frictional force = 23.76N

Explanation: Please see the attachments below

7 0
3 years ago
A pirate fires his cannon parallel to the water but 3.5 m above the water. The cannonball leaves the cannon with a velocity of 1
Bumek [7]

Answer:

202.8m

Explanation:

Given that A pirate fires his cannon parallel to the water but 3.5 m above the water. The cannonball leaves the cannon with a velocity of 120 m/s. He misses his target and the cannonball splashes into the briny deep.

First calculate the total time travelled by using the second equation of motion

h = Ut + 1/2gt^2

Let assume that u = 0

And h = 3.5

Substitute all the parameters into the formula

3.5 = 1/2 × 9.8 × t^2

3.5 = 4.9t^2

t^2 = 3.5/4.9

t^2 = 0.7

t = 0.845s

To know how far the cannonball travel, let's use the equation

S = UT + 1/2at^2

But acceleration a = 0

T = 2t

T = 1.69s

S = 120 × 1.69

S = 202.834 m

Therefore, the distance travelled by the cannon ball is approximately 202.8m.

4 0
2 years ago
Other questions:
  • Which of the following would make a good semiconductor? aluminum germanium gold concrete
    14·2 answers
  • I dont understand??????????????
    6·1 answer
  • A transverse wave is propagated in a string stretched along the x-axis. The equation of the wave, in SI units, is given by:
    10·1 answer
  • A coin is placed 32 cm from the center of a horizontal turntable, initially at rest. The turntable then begins to rotate. When t
    9·1 answer
  • Matt plays badminton. He serves the birdie with a velocity of 4.25 m/s [right] covering a displacement of 5.2 m [forward]. How m
    10·1 answer
  • HELPPPP WILL MARK B IF CORRECT!!!!
    9·2 answers
  • Which geological features are produced when continental plates converge?
    14·1 answer
  • 4. What does doubling the voltage do to the strength of the electromagnet?​
    10·2 answers
  • C.<br>Difference between<br>D) solar energy and fossil fuel energy​
    9·1 answer
  • 3) A school bus traveling at 12 m/s has a momentum of 144,000 kg.m/s.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!