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Harman [31]
3 years ago
9

Choose the nonmetallic elements from the list. Check all that apply. yttrium oxygen boron polonium argon gallium carbon

Physics
2 answers:
nordsb [41]3 years ago
8 0

Answer:

B, E, & G

Oxygen, Argon, & Carbon

Explanation:

izzie
3 years ago
That is correct :)
kodGreya [7K]3 years ago
7 0

Answer:

oxygen

argon

carbon

Explanation:

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An elevator motor in a high-rise building can do 3500 kJ of work in 5 min. Find the power developed by the motor. Explain if you
Ilya [14]

Answer:

P = 11666.6 W

Explanation:

Given that,

Work done by the motor, W = 3500 kJ

Time, t = 5 min = 300 s

We need to find the power developed by the motor. Power developed is given by :

P=\dfrac{E}{t}\\\\P=\dfrac{3500\times 10^3}{300}\\\\P=11666.7\ W

So, the required power is 11666.6 W.

4 0
3 years ago
Hydraulic press is a force multiplier . show mathematically
Vadim26 [7]
Yes it’s is a force multiplier
5 0
4 years ago
A 523.2-W space heater is designed for operation in Germany, where household electrical outlets supply 230 V (rms) service. What
photoshop1234 [79]

Answer:

power = 142.4 W

Explanation:

power of heater in Germany (P₁) = 523.2 W

power of heater in America (P₂) = ?

outlet voltage in Germany (V₁) = 230 V

outlet voltage in America (V₂) = 120 V

  • While in Germany, power = \frac{V₁^{2}}{R}

         523.2 = \frac{230^{2}}{R}

         R = 101.1

  • While in America, also power = \frac{V₂^{2}}{R}

         using the value of R gotten above

         power = \frac{120^{2}}{101.1}

        power = 142.4 W

6 0
3 years ago
The tub of a washing machine goes into its spin cycle, starting from rest and gaining angular speed steadily for 6.00 s, at whic
MatroZZZ [7]

Answer:

N = 42 rev

Explanation:

As we know that initial angular speed of the tub was zero and then it increases uniformly to 4 rev/s in t = 6.00 s

so we will have

\theta_1 = \frac{\omega_f + \omega_i}{2} t

\theta_1 = \frac{2\pi f_2 + 2\pi f_1}{2}(t)

\theta_1 = \frac{2\pi \times 4 + 0}{2}(6)

\theta_1 = 75.4 rad

Now when the tub will comes to rest uniformly after opening the lid in time interval of t = 15 s

then we have

\theta_2 = \frac{\omega_f + \omega_i}{2} t

\theta_2 = \frac{2\pi f_2 + 2\pi f_1}{2}(t)

\theta_2 = \frac{2\pi \times 4 + 0}{2}(15)

\theta_2 = 188.5 rad

Now total angular displacement of the tub is given as

\theta = \theta_1 + \theta_2

\theta = 75.4 + 188.5

\theta = 263.9 rad

so number of revolutions is given as

\N = \frac{\theta}{2\pi}

N = 42 rev

3 0
3 years ago
How many atoms of each element are in the chemical formula NH4NO3?
Igoryamba
 <span>2 Nitrogen, 4 Hydrogen, 3 Oxygen 

9 atoms per molecule. 

NH4, ammonium (not to be confused with ammonia NH3) is a 1+ ion and NO3 is 1-. 
</span>
4 0
3 years ago
Read 2 more answers
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