3 years ago

What Science is/is not and How Physics and Chemistry are Connected

Physics

1 answer:

KengaRu [80]3 years ago

8 0

Earth is Bc it talkads about planter

You might be interested in

A 82-kg skydiver has a speed of 40 m/s at an altitude of 490 m above the ground. Calculate the total mechanical energy of the sk

Sav [38]

Answer:

$ME=459,364J$

Explanation:

Mechanical Energy=Potential Energy+ kinetic Energy

$m=82kg,g=9.8N/kg,h=490m,v=40m/s$

To calculate Kinetic Energy:-

$KE=\frac{1}[2}mv^2\\=\frac{1}{2}\times82kg \times(40m/s)^2\\=65600J$

To calculate Potential Energy:-

$PE=mgh\\=82kg \times9.8N/kg \times490\\=393764$

therefore,

$ME=KE+PE\\=65600+393764\\=459364J$

The skydiver's total mechanical energy is 459365J

8 0

3 years ago

Some radar systems detect the size and shape of objects such as aircraft and geological terrain. What is the frequency of such a

vova2212 [387]

Answer:

$f=1.57\times 10^9\ Hz$

Explanation:

Given that,

A system can detect objects as small as 19.1 cm i.e. 0.191 m. It is the wavelength.

We know that,

Frequency, $f=\dfrac{c}{\lambda}$

So,

$f=\dfrac{3\times 10^8}{0.191}\\\\=1.57\times 10^9\ Hz$

So, the frequency of such a system is equal to $1.57\times 10^9\ Hz$ .

4 0

3 years ago

Which of the following is true concerning nuclear fusion?

Artyom0805 [142]

Choice-a is a very rubbery, imprecise, ambiguous, slippery statement. But it's probably less wrong than any of the other choices on the list.

6 0

3 years ago

14. Which of the following is not an example of work being done?

Natali5045456 [20]

Answer:

B. holding a coffee mug

Explanation:

Something must move a distance for work to be done.

7 0

3 years ago

If a Cu 2+ ion that is initially at rest accelerates through a potential difference of 12 V without friction, how much kinetic e

IgorC [24]

Answer:

23,8eV

Explanation:

A=Uq=12 (V)* 2* 1,6*10^-19 (C)=3,84*10^-18 (J)= 23,8 (eV)

8 0

4 years ago