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DerKrebs [107]
2 years ago
9

HELP PLEASE!!!

Mathematics
1 answer:
svetlana [45]2 years ago
4 0

Answer:

D

Step-by-step explanation:

DEF is merely a straight line. It has to be 180 by definition.

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Martha is late for class, so she races her 75 kg body up a 4.0 meter flight of stairs in only 2.3 seconds. What is Martha’s powe
vovangra [49]

Answer:

1.3\cdot 10^3\text{ J}

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:

W=Fd, 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 F_g=mg, where m = Martha's mass and g = gravitational constant 9.8 m/s/s. Therefore, F_g=75\cdot 9.8=735\text{ N}. Since she raises her body 4.0 meters, the work done must be W=Fd=735\cdot 4=2940\text{ J}.

Since power is equal to work over time and t = 2.3 seconds, we have:

\displaystyle P=\frac{W}{t}=\frac{2940}{2.3}=\boxed{1278\text{ J}}\approx \boxed{1.3\cdot 10^3\text{ J}} (to two significant figures)

7 0
1 year ago
A $20 shirt was 30% off and you had a coupon for another 10% off. What is the new price?
laila [671]

Answer:

$12.60 is the new price!

Step-by-step explanation:

20 x 0.7 = 14

14 x 0.9 = 12.6

Hope this helped!

4 0
2 years ago
Read 2 more answers
Math question, I appreciate ANY help! :)
pav-90 [236]
.......................................................................................

8 0
3 years ago
In need of help with this question .
Andreyy89
I wish I could help you but get got it the answers are more correct and accurate
3 0
3 years ago
How long does it take an airplane flying at a speed of 600 miles per hour to fly 3,000 miles?
ser-zykov [4K]

Answer:

<u>Option D is answer.</u>

Step-by-step explanation:

Hi there!

From the question;

Speed (s) = 600 miles/hr

Distance (d) = 3000 miles

Time (t) = ?

We know that;

Speed (s) = \frac{Distance(d)}{Time (t)}

600 = \frac{3000}{t}

t = \frac{3000}{600}

Therefore, it will take 5 hours to fly 3000 miles.

Hope its helps!

7 0
2 years ago
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