1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Soloha48 [4]
2 years ago
13

Ira is concerned about his posture. He tests it by seeing how long he can hold good posture and finds that he feels the most dis

comfort in his back. What does that suggest that he needs to do?
A.
Keep a neutral spine.
B.
Place his hands on his hips.
C.
Arc his back when he walks.
D.
Tuck his chin close to his chest.
Physics
1 answer:
larisa [96]2 years ago
6 0

Answer: C

Explanation:

JUST TO SIMPLE

You might be interested in
How many significant figures from 0,020170 kg ?<br> a. 3<br> b. 4<br> c. 5<br> d. 6<br> e. 7
Igoryamba
> Non-zero numbers (like 1,2,3,4...) are always significant
> A zero sandwiched between two non-zero numbers is always significant
> Trailing zeros in a decimal (not whole number like million) are always significant.

<span>0,020170 = 2.0170 × 10^-2

5 sig-figs
 </span>


4 0
2 years ago
What is the value for the kinetic energy for a n = 5 Bohr orbit electron in zeptoJoules?
Ne4ueva [31]

Answer:

The kinetic energy is 86.6 zepto joules.

Explanation:

Given that,

Number of orbit n =5

We know that,

Bohr's radius for hydrogen atom is

r = 0.53\times10^{-10}\times n^2\ m

Now, put the value of n in the formula of radius

r=0.53\times10^{-10}\times5^2

r =1.33\times10^{-9}\ m

We need to calculate the kinetic energy

Using formula of kinetic energy

E_{k}=\dfrac{1}{4\pi\epsilon_{0}}\times\dfrac{e^2}{2\times r_{s}}

Put the value into the formula

E_{k}=\dfrac{9\times10^{9}\times(1.6\times10^{-19})^2}{2\times1.33\times10^{-9}}

E_{k}=8.66\times10^{-20}\ J

We know that,

1\ zepto\ joule=1\times10^{-21}\ J

The kinetic energy is

E_{k}=\dfrac{8.66\times10^{-20}}{1\times10^{-21}}

E_{k}=86.6\ zepto\ Joules

Hence, The kinetic energy is 86.6 zepto joules.

8 0
3 years ago
Rubber is a type of _________.<br> radiator<br> distributor<br> insulator<br> conductor
Talja [164]
C. insulator
Hope this helps ya!
5 0
3 years ago
Read 2 more answers
A helicopter ambulance flew from one hospital to another in a straight line. The pilot had to change speed several times due to
Olenka [21]

Answer:

Explanation:

All the rest of the information is extraneous. The only 2 things you have to know are

d = 20 km

t = 8 minutes = 8/60 hours = 0.13333333

So the speed is s = d/t

s = 20/0.1333333 = 150 km/hour

Note: you have not specified what units the speed is. I suppose you could answer 20/8 = 2.5 km/min

4 0
3 years ago
How are problems best solved by scientists?
spin [16.1K]
One scientist proposes an idea and other scientists repeat his or her experiments so they can Accept the Idea.
3 0
2 years ago
Read 2 more answers
Other questions:
  • A hypothetical spherical planet consists entirely of iron. what is the period of a satellite that orbits this planet just above
    15·1 answer
  • Which errors might occur when measuring length of object​
    10·1 answer
  • A grapefruit has a weight on earth of 4.9 newtons. What is the grapefruit's mass?
    10·2 answers
  • Determine the mass of the earth from the known period and distance of the moon.
    14·1 answer
  • Two UFPD are patrolling the campus on foot. To cover more ground, they split up and begin walking in different directions. Offic
    14·1 answer
  • What is robot??????????
    13·1 answer
  • You pull a 200 kg box straight up with a rope connected to a helicopter. If the
    5·2 answers
  • 3. A 6 kg block moving to the right at 4 m/s collides with and sticks to a stationary block of unknown mass. If the two blocks m
    5·1 answer
  • In a series circuit, the current is _______
    14·2 answers
  • How do animals affect the amount of carbon earth’s atmosphere
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!