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3 years ago

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.

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3 years ago

Hydraulic press is a force multiplier . show mathematically

Vadim26 [7]

Yes it’s is a force multiplier

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

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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

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

$N = 42 rev$

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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.

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3 years ago

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