Answer:
Step-by-step explanation:
Power is defined by work over time. In physics, work can be defined as the energy transferred over from an applied force over some distance. As a formula:
, where F = force applied and d = distance that force is applied over.
*It is worth noting that F must be parallel to the distance travelled. If it is perpendicular, no work is done, and if it is at an angle, find the parallel component and use that for F.
In this case, the force applied must counter the force of gravity on Martha, which is given by 
, where m = Martha's mass and g = gravitational constant 9.8 m/s/s. Therefore, 
. Since she raises her body 4.0 meters, the work done must be 
.
Since power is equal to work over time and t = 2.3 seconds, we have:
(to two significant figures)
When a sign has the underline, it means it is also equal to.
for example,
x
10
so the solution for "x" is greater than or equal to 10
hope this helps!
Answer:
The numbers 2, 5 or<u> 27</u>
Step-by-step explanation:
The sum of those three numbers is 34. 2+5+27=34
Oh and 21 divided by 3 is 7
Answer:
0.963
Step-by-step explanation:
It’s correct
Answer:
80%
Step-by-step explanation:
out of 20, 1 would be 5%
4 = 20%
100% - 20% = 80%
