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Makovka662 [10]
2 years ago
9

What are non-metals?explain briefly​

Physics
2 answers:
aliya0001 [1]2 years ago
3 0

Answer:

In chemistry, a nonmetal is a chemical element that is mechanically weak in its most stable form, brittle if solid, and usually gains or shares electrons in chemical reactions. There is no universal agreement on which elements are nonmetals; the numbers generally range from fourteen to twenty-three, depending on the criterion or criteria of interest.

Nitella [24]2 years ago
3 0

Answer:

Non-metals are those which lack all the metallic attributes. They are good insulators of heat and electricity. They are mostly gases and sometimes liquid. Some they are even solid at room temperatures like Carbon, sulphur and phosphorus.

Explanation:

Hydrogen, hydrogen, chlorine, fluorine, carbon, nitrogen, arsenic, phosphorus, selenium are examples of non-metal.

hope i helped

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Paying attention to units is important. When solving for energy, power needs to be measured in kilowatts (kW). If power is given
Vitek1552 [10]

Answer:

Divide by 1000

Explanation:

As stated in the name, a Kilowatt is 1000 watts. So let's say you have 200 watts and you need them in kW. Since 1kW=1000W, we need to divide 200/1000 to get 200/1000=0.2kW

6 0
2 years ago
What factors affect the speed of a wave? Check all that apply.
just olya [345]

Answer:

Medium and Temperature of medium

8 0
3 years ago
Read 2 more answers
A hare and a tortoise compete in a race over a straight course 1.00 km long. The tortoise crawls at a speed of 0.200 m/s toward
vagabundo [1.1K]

Answer:

a) 5 m from the finish line

b) 4875 s

Explanation:

distance = 1 km

tortoise speed = 0.2 m/s

speed of hare = 8 m/s

time take by hare t reach 0.8 km = \dfrac{800}{8} = 100 s

time taken by tortoise to travel 1 km = \dfrac{1000}{0.2} = 5000s

time taken by the hare to travel 0.2 km = \dfrac{200}{8} = 25 s

time taken by the tortoise to travel 0.2 km = \dfrac{200}{0.2} = 500s

distance traveled by tortoise in 25 second = 25 × 0.2 = 5 m

a) when tortoise is 5 m from the finish line then hare will resume the race.

b) the hare will be stationary for = 5000 - 125  = 4875 s

6 0
3 years ago
4. An object is thrown vertically upward with a speed of 25 m/s. How much time passes before it
vlada-n [284]

Answer:

<em>Option b is correct: 4.1 s</em>

Explanation:

<u>Vertical Launch</u>

An object launched thrown vertically upward where air resistance is negligible, reaches its maximum height in a time t, given by the equation:

\displaystyle t=\frac{v_o}{g}\qquad\qquad[1]

Where vo is the initial speed and g is the acceleration of gravity g=9.8 m/s^2.

Once the object reaches that point, it starts a free-fall motion, whose speed is (downward) given by:

v_f=g.t\qquad\qquad[2]

The object considered in the question is thrown with vo=25 m/s. The time taken to reach the maximum height is given by [1]:

\displaystyle t=\frac{25}{9.8}=2.551\ sec

The object starts its falling motion and at some time, it has a speed of vf=15 m/s. Let's find the time by solving [2] for t:

\displaystyle t=\frac{15}{9.8}=1.531\ sec

The total time taken by the object to go up and down is

t_t=2.551\ s+1.531\ s=4.081\ s

a. This option is incorrect because it's far away from the answer.

d. This option is incorrect because it's far away from the answer.

b. This option is correct because it's a good approximation to the calculated answer.

e. This option is incorrect because it's far away from the answer.

c. This option is incorrect because it's far away from the answer.

5 0
3 years ago
Convert a speed of 4.50 km/h to units of ft/min. (1.00 m = 3.28 ft).a. 165 ft/min.b. 82.3 ft/min.c. 886 ft/min.d. 246 ft/min.e.
Ronch [10]

Answer:

246ft/min

Explanation:

In this problem we are faced with unit conversion.

We are expected to convert from km/h to ft/min

Given that

1.00 m = 3.28 ft

1km(1000m)= 3280 ft

But we need to convert 4.5km to ft

Hence in ft 4.5km= 3280*4.5

= 14760ft

We now convert hour to minutes

60min make 1 hour

Therefore the convert form km/h to ft/min is

= 14760/60= 246ft/min

The answer is 246ft/min

4 0
3 years ago
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