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OverLord2011 [107]
3 years ago
9

Based on the image, determine the formula for a compound formed between lithium and sulfur. A) Li2S B) Li3S C) LiS D) LiS2

Physics
1 answer:
VashaNatasha [74]3 years ago
5 0

Answer: A

Explanation:

I got it right just wanted to have a letter answer for my fellow USA TestPrep people

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In her hand, a softball pitcher swings a ball of mass 0.245 kg around a vertical circular path of radius 59.8 cm before releasin
GuDViN [60]

Answer:

The velocity is v_b = 20.17 \ m/s

Explanation:

From the question we are told that

   The mass of the ball is  m = 0.245 \ kg

   The radius is  r =  59.8 \  cm  =  0.598 \ m

   The force is  F =  30.9 \ N

   The speed of the ball is  v = 16.0 \ m/s.

Generally the kinetic energy at the top of the circle is mathematically represented as

    K_t  =  \frac{1}{2} *  m  *  v^2

=> K_t  =  \frac{1}{2} *  0.245   *  16.0 ^2  

=> K_t  =  31.36 \ J  

Generally the work done by the force applied on the ball from the top to the bottom  is mathematically represented as

       W =  F *  d

Here  d is the length of  a semi - circular arc which is mathematically represented as

       d =  \pi * r

So

      W =  30.9 *  0.598

      W = 18.48 \ J

Generally the kinetic energy at the bottom is mathematically represented as

      K_b  =  \frac{1}{2} *  m *  v_b^2

=>    K_b  =  \frac{1}{2} *  0.245  *  v_b^2

=>   K_b  =  0.1225  *  v_b^2

From the law of energy conservation

     K_t +  W  =K_b

=>    31.36+  18.48 = 0.1225  *  v_b^2

=>    v_b = 20.17 \ m/s

3 0
3 years ago
This proportion can be changed to (0.45)y = x, where x represents the person's weight in kilograms and y represents the person's
erica [24]
If .45y = 65 
Then solving for y would give you: <span>y = 144</span>
7 0
3 years ago
Will give the first answer brainliest. Picture attached.
mylen [45]

Answer:

2699.73661Ω or 2.697kΩ

Explanation:

V=IR

So...

R=\frac{V}{I}

So...

\frac{12.3}{0.004556} = 2699.73661Ω

This is the answer, but the resistance is much too high for a circuit like this

4 0
3 years ago
What is a crumple zone????
aksik [14]
A part of a motor vehicle
3 0
3 years ago
Read 2 more answers
A 30.0-g object connected to a spring with a force constant of 40.0 N/m oscillates with an amplitude of 6.00 cm on a frictionles
Naddika [18.5K]

Answer:

a) 72mJ

b) 0.33m/s

c) 54mJ

d) 18mJ

Explanation:

(a) The total energy of the system is given by:

E_T=\frac{1}{2}kA^2

where k is the force constant and A is the amplitude. By replacing we get:

E_T=\frac{1}{2}(40N/m)(0.06m)^2=0.072J = 72mJ

(b) we can get the speed by the conservation of energy (the kinetic energy and potential energy must equal the total energy in any place):

E_T=E_k+E_p\\\\\frac{1}{2}kA^2=\frac{1}{2}mv^2+\frac{1}{2}kx^2\\\\v=\sqrt{\frac{kA^2-kx^2}{m}}=\sqrt{\frac{(40N/m)((0.06m)^2-(0.0115m)^2)}{0.03kg}}=0.33m/s

where we have used that x=1.15cm=0.0115m; A=6.00cm=0.06m

(c) Again, by the conservation of energy:

E_k=\frac{1}{2}k(A^2-x^2)=\frac{1}{2}(40N/m)((0.06m)^2-(0.03m)^2)=0.054J=54mJ

(d) E_p=\frac{1}{2}kx^2=\frac{1}{2}(40.0N/m)(0.03m)^2=0.018J=18mJ

hope this helps!!

6 0
3 years ago
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