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3 years ago

Whats the answer to this question show in the picture 2 questions

Physics

2 answers:

astraxan [27]3 years ago

3 0

1) D

2) I would say A, but not 100%, its the only one that makes sense tho

almond37 [142]3 years ago

3 0

The first one would be KE=0.5m(v to the 2nd power)

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Define an element and give 5 examples of elements that are important to life .

fenix001 [56]

Answer:

A pure substance consisting only of atoms with the same number of protons in their nuclei-these appear on the periodic table

Oxygen

Hydrogen

Carbon

Sulfur

Phosphate

Nitrogen

Magnesium

Calcium

Potassium

Chlorine

(I know that these are more examples than needed, but you can use any)

8 0

3 years ago

What is the speed of a wave with 3Hz frequency and a wavelength of 9 m

SIZIF [17.4K]

Answer:

Given

Frequency (f) = 3Hz

Wavelength = 9 m

Speed = ?

Explanation:

we know

Speed = wavelength * frequency

= 9*3

= 27 m/ s

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4 years ago

If a weightlifter lifts a 286 kg mass 0.25 meters above his head, how much PEg does the mass have?

vazorg [7]

Answer:

Change in potential energy is 700.7 J.

Explanation:

Given:

Mass of the object is, $m=286$ kg

Height to which the object is raised above his head, $h=0.25$ m

Acceleration due to gravity is, $g=9.8$ m/s²

We know that for a mass $m$ raised to a height $h$ , the change in potential energy is given as:

$\Delta PE=mgh$ , where, $\Delta PE\rightarrow \textrm{Change in Potential Energy}$

Now, plug in the given values and solve.

$\Delta PE=286\times 9.8\times 0.25=700.7\textrm{ J}$

Therefore, the change in the potential energy is 700.7 J.

3 0

4 years ago

Read 2 more answers

An average man is 80 k (800 N) and the area of the shoes he is wearing is 0.0092 m2. What is the pressure he is exerting on the

S_A_V [24]

Answer:

P = 86956.52 Pa

Explanation:

Data:

F = 800 N
A = 0.0092 m²
P = ?

Use the formula:

$\boxed{\bold{P=\frac{F}{A}}}$

Replace and solve:

$\boxed{\bold{P=\frac{800\ N}{0.0092\ m^{2}}}}$

$\boxed{\bold{P=86956.52\ Pa}}}$

The pressure it exerts on the ground is <u>86956.52 Pascal.</u>

Greetings.

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3 years ago

On a time line.

Sergeeva-Olga [200]

Answer:

Explanation:

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3 years ago