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3 years ago

6

what is most likely to be studied by direct observation? brown and white spots on dog, tail 25 cm. long, dog eating organic food

or rats sleeping close to others.

1 answer:

mote1985 [20]3 years ago

4 0

I think it would be brown and white spots, because you can see that immediately and it's a color. Hope that helps!

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A 107 gram apple falls from a branch that is 2 meters above the ground. (a) How much time elapses before the apple hits the grou

andreev551 [17]

Answer:

The time of motion is 0.64 s.

Explanation:

Given;

mass of the apple, m = 107 g

height of fall, h = 2 m

The velocity of the apple when it hits the ground is calculated from the law of conservation of energy;

$P.E = K.E\\\\mgh = \frac{1}{2} mv^2\\\\gh = \frac{1}{2} v^2\\\\v^2 = 2gh\\\\v = \sqrt{2gh} \\\\v = \sqrt{2\times 9.8\times 2} \\\\v = 6.261 \ m / s$

The time of motion is calculated;

v = u + gt

6.261 = 0 + 9.8t

6.261 = 9.8t

t = 6.261 / 9.8

t = 0.64 s

Therefore, the time of motion is 0.64 s

7 0

3 years ago

Can someone pls help! I’m stuck on c and d. I’ll rate your answer the brainliest

Mkey [24]

Answer:

i think is c

Explanation:

7 0

2 years ago

Read 2 more answers

Present day Earth is in the _______.

Ira Lisetskai [31]

Present day earth is in the Cenozoic era and the time period for it is 66 million years ago to today.

3 0

3 years ago

What is 56.6666666667 in scientific notation?

Dafna11 [192]

Answer:

5.67 x 10^ 1

Explanation:

Move the decimal once to the left

4 0

2 years ago

The frequency of a sound wave was measured to be 351 Hz. If you know that the speed of sound in air was 343 m/s, then determine

netineya [11]

Answer:

wavelength of the sound wave will be 0.977 m

Explanation:

We have given frequency of the sound wave f = 351 Hz

Speed of the sound wave v = 343 m/sec

We have to find the wavelength of the sound wave

We know that velocity of the sound wave is given by $v=\lambda f$

So wavelength of the sound wave $\lambda =\frac{v}{f}=\frac{343}{351}=0.977m$

So wavelength of the sound wave will be 0.977 m

4 0

3 years ago