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4 years ago

What period can you find the element thallium in??

1 answer:

4 0

Other families might be more private, so a girl might not know exactly what to say or whom to tell. But this news needs to be shared, at least with one grown-up in the family. You might just pull the person aside and say it clearly, like this: "I got my first period today. Do you think you can help me get some supplies?"

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A 0.32 kg turntable of radius 0.18 m spins about a vertical axis through its center. A constant rotational acceleration causes t

Kruka [31]

Answer: $18.85 rad/s^2$

Explanation:

Given

mass of turntable $m=0.32 kg$

radius $r=0.18 m$

$N=24 rev/s$

$\omega =2\pi N=2\pi 24$

$\omega =48\pi rad/s$

time interval $t=8 s$

using $\omega =\omeag _0+\alpha t$

where $\omega =final\ angular\ velocity$

$\omega _0=initial\ angular\ velocity$

$\alpha =angular\ acceleration$

$t=time$

$48\pi =0+\alpha \times 8$

$\alpha =6\pi rad/s^2$

$\alpha =18.85 rad/s^2$

5 0

3 years ago

If gravity is the only force present, what is the total mechanical energy of a

Y_Kistochka [10]

Answer:

(D) is correct option.

Explanation:

At a particular time, the potential energy of a rock is 500 J and its kinetic energy is 600 J.

It is required to find the mechanical energy of the rock. Mechanical or total energy is the sum of kinetic and potential energy. So,

TE = K+ P

TE = 500 J + 600 J

TE = 1100 J

So, the total mechanical energy of a rock is 1100 J. Hence, the correct option is (D).

3 0

3 years ago

A force of 50 n is exerted to the right on a 15 kg car at the same time a 30 n force is exerted to the left on the car. find the

choli [55]

Find out what the force is and yiy have your answer

5 0

3 years ago

The escape velocity at the surface of Earth is approximately 11 km/s. What is the mass, in units of ME (the mass of the Earth),

SVETLANKA909090 [29]

Answer:11 km/s

Explanation:

Given

Escape velocity at the surface of earth is 11 km/s

Escape velocity is given by

$V_e=\sqrt{\frac{2GM}{R}}$

Escape velocity at the surface of earth

$11=\sqrt{\frac{2GM}{R}}$ --------------------1

If Escape velocity is three times and the radius is also the three times

$V_e_2=\sqrt{\frac{2G(3M)}{3R}}$

$V_e_2=\sqrt{\frac{2GM}{R}}=V_e$

i.e. $V_e_2=11 km/s$

5 0

3 years ago

the natural process where the sun's energy is trapped by the atmosphere to make the earth warm enough for life is known as globa

alexira [117]

The natural process is called greenhouse effect. This is when the Sun's light enters the Earth, and converts to heat. Light passes through the Earth's atmosphere much easier compared to heat. Because of this, heat is trapped on Earth because it cannot exit the atmosphere as easily as light does.

6 0

4 years ago