Please help pleaseeeee

Mathematics

1 answer:

S_A_V [24]3 years ago

8 0

Answer: welp im in 7th grade so uh... i may be underqualified... but here's my attempt! if it's wrong just lmk and I'll delete it

In the owl world egg laying usually happens about one month after courtship begins. The incubation period for owl eggs is about 30 days, so taking 2 months to increase population is about normal.

Step-by-step explanation: sorry if it's wrong

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Find the arc length of the semicircle. Either enter an exact answer in terms of \piπpi or use 3.143.143, point, 14 for \piπpi an

DedPeter [7]

Answer:

$3.14r$ or $\pi r$

Step-by-step explanation:

Given:

A semicircle.

To find:

Arc length of the semicircle = ?

Solution:

Formula for angle subtended by an arc on the center of circle is given as:

$\theta = \dfrac{l}{r}$

where $l$ is the arc length and

$r$ is the radius of semicircle.

Angle of full circle is $2\pi$

So, angle of semicircle = $\pi$

Using the formula, we can see that:

$l = \theta \times r$

$\Rightarrow l = \pi \times r\\\\OR\\\Rightarrow l = 3.14r$

So, the answer is:

Arc Length of semicircle = $3.14r$ or $\pi r$

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3 years ago

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 $W=Fd=735\cdot 4=2940\text{ J}$ .