What is the gravitational force between 90kg man and his 35 kg dog when they are 3m apart ?

does it require more energy to brew 12 cups with the coffee-maker or reheat 12 cups of coffee in a microwave?

Leni [432]

It would take more energy to reheat 12 cups because only 1 or 2 cups can fit in a microwave rather an than brewing 12 cups in a coffee pot.

6 0

3 years ago

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Elizabeth makes her exercises a little harder each time she does them. Which principle of fitness is she following?

anygoal [31]

Answer:

overload

Explanation:

well she does to much to make it hard for herself so it would be overload

sorry if i'm wrong

4 0

3 years ago

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A cardinal (Richmondena cardinalis) of mass 3.70×10−2 kg and a baseball of mass 0.144 kg have the same kinetic energy. What is t

Radda [10]

Answer:

$\frac{p_{c}}{p_{b}}\approx 0.507$

Explanation:

Since the cardinal and ball have the same kinetic energy, it is possible to determine the ratio between speeds. (c for cardinal, b for baseball)

$K_{c} = K_{b}$

$\frac{1}{2}\cdot m_{c}\cdot v_{c}^{2}= \frac{1}{2}\cdot m_{b}\cdot v_{b}^{2}$

$\frac{v_{c}}{v_{b}}=\sqrt{\frac{m_{b}}{m_{c}} }$

The ratio is obtained by multiplying each side by $\frac{m_{c}}{m_{b}}$ :

$\frac{p_{c}}{p_{b}}=\frac{m_{c}}{m_{b}}\cdot \sqrt{\frac{m_{b}}{m_{c}} }$

$\frac{p_{c}}{p_{b}}= \sqrt{\frac{m_{c}}{m_{b}} }$

The value of this ratio is:

$\frac{p_{c}}{p_{b}}\approx 0.507$

3 0

4 years ago

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An object is placed 20 cm from a convex lens of focal length 25 cm. is the lens converging or diverging in this case? answer

den301095 [7]

When object distance is smaller than the focal length of a convex lens, then the rays diverge.

Here, object distance = 20 cm

focal length = 25 cm

20 < 25

Thus, the lens are <u>diverging</u>

<u></u>

<h3>What is focal length?</h3>

The fundamental description of a camera lens is its focal length, which is often expressed in millimeters (mm). It is not a measurement of the physical length of a lens.

But rather a calculation of the optical distance between the focal plane of the camera's digital sensor or 35mm film to the location where light rays converge to make a sharp image of an object. When a lens is focussed to infinity, its focal length can be calculated.

Learn more about focal length

brainly.com/question/25779311

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6 0

2 years ago

Please answer and explain the equations of how you got the answer

Dima020 [189]

Answer:

a) H=277113.45m

b) t = 142.09 seconds

Solution

In this question we have given