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slava [35]
3 years ago
11

Children in a tree house lift a small dog in a basket 4.00 m up to their house. If it takes 187 J of work to do this, what is th

e combined mass of the dog and basket?
Physics
1 answer:
Vika [28.1K]3 years ago
6 0
A=Fh
A - work
F - force
h - distance

F=mg
m - mass (god+basket)

so
A=mgh
187 = m*10*4
187=40m
m=187/40
m=4.675 kg
or 4kg and 675g

pretty small dog...
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Armatures are wound to provide high voltage, high current, or some specific combination of voltage and current. Which type of wi
Lena [83]

Answer:

<em><u>Wave Winding</u></em>

Explanation:

Wave type of winding is mostly used for a circuit with a very high voltage and a comparable low magnitude of current. The winding can be Progressive (Right slot after first round turn) or Retrogressive (Left slot after first round turn).

7 0
3 years ago
An engineer is designing a spring to be placed at the bottom of an elevator shaft. If the elevator cable should happen to break
mamaluj [8]

Answer:

Value that the spring constant k = 12Mg / h

Explanation:

According to 2nd law of Newton:

upward force of the spring= F

The weight of the elevator W = mg

            F = Mg = M(5g)

==> F =6Mg.

As the spring is compressed to its maximum distance ie s,the maximum upward acceleration comes just , Hence

  F =ks = 6Mg

==>   s = 6Mg/k

We have gravitational potential energy turning into elastic potential of the spring as the elevator starts at the top some distance h from the spring, and undergoes a total change in height equal to h + s, so:

            Mg(h+s) = 1/2ks2

And plugging in our expression for s:

         Mg(h+6Mg/k)= 1/2k(6Mg / k)2

          gh + 6M2g2/k = 1/2k(36M2g2 /k2)

        Mgh +6M2g2/k = 1/2k(36M2g2 /k2)

             gh + 6Mg2/k = 18Mg2 / k

                             gh = 12Mg2 / k

                               h = 12Mg / k

                               k = 12Mg / h

7 0
4 years ago
Read 2 more answers
Calculate the acceleration of a turtle going from 0.3 m/s to 0.7 m/s in 30 seconds.
uysha [10]
  • Initial velocity=u=0.3m/s
  • Final velocity=v=0.7m/s
  • Time=t=30s

\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}

\\ \sf\longmapsto Acceleration=\dfrac{0.7-0.3}{30}

\\ \sf\longmapsto Acceleration=\dfrac{0.4}{30}

\\ \sf\longmapsto Acceleration=0.01m/s^2

7 0
3 years ago
Pls help i will give u brainliest!
Ivan

Answer: B.

Explanation:

4 0
3 years ago
A mass spectrometer is being used to separate common oxygen-16 from the much rarer oxygen-18, taken from a sample of old glacial
yaroslaw [1]

Given:

m16=2.66 x 10^-26 kg

v=3.7 x 10^6 m/s

B= 2.0

These are singly charged hence

q=1.6 x 10^-19 C

The ratio of these two masses is 16 to 18.

Let the mass of m18 be x

m18/m16= x/(2.66 x 10^-26)

18/16= x/(2.66 x 10^-26)

x= [18 x (2.66 x 10^-26)]/16

=2.99 X 10^-26 kg

When they hit a target after traversing a semicircle the distance between them is the difference of their diameter.(∆d)

∆d=2r18-2r16

Where r18 is the radius of the m18 mass

r16 is the radius of the m16 mass.

∆d=2(r18-r16).

The radius of an object transversing in a magnetic field is given by the below formula.

r = mv/qB

m is the mass of the object.

v is the velocity of the object

q is the charge carried by the object

B magnetic field

∆d=2(r18-r16). Substituting the value for r from the above formula.

∆d=2[(m18-m16)v]/qB

m18-m16=

(2.99-2.66)x10^-26=0.33x 10^-26

qB=1.6x10^-19 x2=3.2 x10^-19

Substituting these values in the ∆d formula we get

∆d=

2x3.7x10^6x0.33x10^-26/3.2x10^-19

=2.442 x 10^-20/3.2x 10^-19

=0.76 x10-1m

4 0
3 years ago
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