H e l p a h o m i e o u t t h a n k s

What is the molecular formula for the hydrocarbon in the mass spectrum above?

PtichkaEL [24]

What is the structure of a hydrocarbon that has $\mathrm{M}^{+}=120$ in its mass spectrum and has the following $1 \mathrm{H}$ NMR spectrum? 7.25 $\delta(5 \mathrm{H}, \text { broad singlet); } 2.90 \delta(1 \mathrm{H}, \text { septet, } J=7 \mathrm{Hz}) ; 1.22 \delta(6 \mathrm{H},\text { doublet, }$ $J=7 \mathrm{Hz})$

6 0

3 years ago

A tangential force of 1500 N exerted upon the upper surface of a cube of 20 cm edge. Calulate the shear modulus of the cube mata

I am Lyosha [343]

Answer:

The shear modulus of the cube material is $7.5 \times 10^6 N/m^2$ . 

Explanation:

Given that shearing force applied F = 1500 N 

Displacement produced x = 0.1 cm=0.001 m 

side of the cube =20 cm = 0.2 m 

Since the object is a cube the upper surface is a square and it is on this surface the shearing

force is applied

area of the upper surface $A=a \times a=(20 \times 10^(^-^2^))^2=400 \times 10^(^-^4^) m$ 

shear strain = tan⁡ θ = $\frac {x}{h} = \frac {0.001}{0.2} =0.005$ 

shearing stress = $\frac {F}{A} = \frac{1500}{0.04} = 37500 N$ 

modulus of rigidity η $= \frac{(shearing \ stress)}{(shearing \ strain)}$ 

 $= \frac{37500}{0.005}=7.5 \times 10^6 N/m^2$ 

8 0

3 years ago

If the action force is the swimmer pushing water in the leftward direction, what is the reaction force?

Sphinxa [80]

According to Newton's Third Law of Motion, to every action, there is an equal and opposite reaction; action and reaction act on different bodies.
Here, the action force is in the leftward direction, so the reaction will be in the opposite direction.
If the action force is the swimmer pushing water in the leftward direction, then the reaction force is in the rightward direction.
And the reaction force will be given by the water on the swimmer.

Answer:

The reaction force is the water pushing the swimmer in the rightward direction.

Hope you could get an idea from here.

Doubt clarification - use comment section.

3 0

2 years ago

A river flows at 2m/s the velociy of ferry relative to the shore is 4m/s

Alex_Xolod [135]

Answer:

Explanation:

.....

7 0

3 years ago

If the frequency of a sound wave is 250 hertz and its wavelength is 1.36 meters, what is the wave's velocity?

TiliK225 [7]

The answer is 340 meters/second

4 0

3 years ago

Read 2 more answers