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eduard
4 years ago
8

Can u plz help I'm failing and I have 2 weeks to get my grades up someone help me plz plz plz plz this is not a test ok it was h

w and then I got extra credit and a lot of other stuff but plz help me plz plz plz plz

Physics
2 answers:
Anastaziya [24]4 years ago
7 0
1. B
2. A
3. B
4. C
5. heterogeneous
6. element
7. do
8. true
9. true
10. true
faltersainse [42]4 years ago
3 0
1. B
2. A
3. B
4. C
5. heterogeneous
6. element
7. do
8. true
9. true
<span>10. true

Hope you pass! :)

</span>
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3. A 20 kg lawnmower is pushed by its handle, which makes a 40 degree angle with the horizontal. What
Mkey [24]

<u>13788 J is required to finish the work.</u>

Explanation:

Given that,  

Mass of lawnmower is 20 kg  

Force = 30 N

\text { Angle }(\theta)=40^{\circ}

Displacement ( distance moved )= 20m

The force of 30N is applied along the direction of motion and was applied for the whole 20 m.

The formula of work done for one pass is

\text { Work done }=\text { force } \times \text { displacement } \times \cos \theta

Substituting the given data into the formula,

W=30 \times 20 \times \cos 40^{\circ}

\mathrm{W}=600 \times \cos 40^{\circ}

\mathrm{W}=600 \times 0.766

W = 459.6 J

Work done for one pass = 459.6J

Now, work done for 30 passes is calculated by multiplying the work done for one pass into 30.

\text { Then the work done for } 30 \text { passes is } 459.61 \times 30=13788 \mathrm{J}

Work is done by the person pushing the mower to finish the work is <u>13788 J</u>.

5 0
3 years ago
Explain why it is not possible to determine the type of an atom by simply knowing how many neutrons it has.
nikklg [1K]

Answer:

Explanation:

There are isotopes, which are the same atom, but different number of neutrons, so only neutrons cannot determine the atom

6 0
3 years ago
Steam at 4 MPa and 400C enters a nozzle steadily with a velocity of 60 m/s, and it leaves at 2 MPa and 300C. The inlet area of
frez [133]

Answer:

(A) 4.09 kg/s

(B) 589.9 m/s

(C)   0.0008707 m^{3} =  8.71 cm^{2}

Explanation:

inlet pressure of steam (P1) = 4 MPa

inlet temperature of steam (T1) = 400 degree celcius

inlet velocity (V1) = 60 m/s

outlet pressure (P2) = 2 MPa

outlet temperature (T2) = 300 degree celcius

inlet area (A1) = 50 cm^{2} = 0.005 m^{2}

rate of heat loss (Q) = 75 kJ/s

(A) mass flow rate (m) = \frac{A1 x V1}{α1}

where the initial specific volume (α1) for the given temperature and pressure is gotten from tables A-6 = 0.07343 m^3/kg

m = \frac{0.005 x 60}{0.07343}

m = 4.09 kg/s

(B) we can get the outlet velocity using the energy balance equation

  E in = E out

   m(h1 + \frac{(V1)^{2}}{2}) =  m(h2 + \frac{(V2)^{2}}{2})

V2 = \sqrt{2(h1 - h2) +(V1)^{2} - 2\frac{Q}{m}

where h1 and h2 are the enthalpies and are gotten from table A-6

V2 = \sqrt{2 x 1000 x(3214.5 - 3024.2) +(60)^{2} - 2\frac{75 x 1000}{4.09}

V2 = 589.9 m/s  

(C) the outlet area is gotten from mass flow rate (m) = \frac{A2 x V2}{α}

  A2 = (α2 x m) / V2

where the initial specific volume (α2) for the given temperature and pressure is gotten from tables A-6 = 0.12552 m^3/kg

A2 = (0.12552 x 4.09) / 589.5 = 0.0008707 m^{3} =  8.71 cm^{2}

4 0
3 years ago
1.A star has an absolute magnitude of 4 and a surface temperature of 5,000 degrees C. According to the HR Diagram list the type
Luda [366]
1) Supergiant Star is the type of star found at these coordinates.2) <span>The stars that are found would be dwarf stars .
3) </span><span>This would also be dwarf stars.
4) </span><span>Absolute magnitude is how you see the stars brightness from 32.6 LY, scientist use this to determine the categories of stars .
5) </span><span>The Main sequence has the most stars.</span>
3 0
3 years ago
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A uniform rod of length 50cm and mass 0.2kg is placed on a fulcrum at a distance of 40cm from the left end of the rod. At what d
Aleks04 [339]
I’m pretty sure it’s b
8 0
3 years ago
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