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3 years ago

1. All screws give the same M.A.

Physics

2 answers:

Fofino [41]3 years ago

8 0

Answer:

Explanation:

1. All screws give the same M.A.

False - it depends on screw size and threads

2. A screw does its job by moving.

True - as far as screw as a machine

3. A screw with more threads has a smaller M.A.

False - more threads increase output force i.e. higher MA

4. Screws can be used to move things. *

True

igomit [66]3 years ago

4 0

Answer:

Explanation:

1. false

2. true

3. false

4. true

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A parallel-plate capacitor with plates of area 360 cm2 is charged to a potential difference V and is then disconnected from the

Softa [21]

Answer:

$Q=3.9825\times 10^{-9} C$

Explanation:

We are given that a parallel- plate capacitor is charged to a potential difference V and then disconnected from the voltage source.

1 m =100 cm

Surface area =S= $\frac{360}{10000}=0.036 m^2$

$\Delta d=0.8 cm=0.008 m$

$\Delta V=100 V$

We have to find the charge Q on the positive plates of the capacitor.

V=Initial voltage between plates

d=Initial distance between plates

Initial Capacitance of capacitor

$C=\frac{\epsilon_0 S}{d}$

Capacitance of capacitor after moving plates

$C_1=\frac{\epsilon_0 S}{(d+\Delta d)}$

$V=\frac{Q}{C}$

Potential difference between plates after moving

$V=\frac{Q}{C_1}$

$V+\Delta V=\frac{Q}{C_1}$

$\frac{Qd}{\epsilon_0S}+100=\frac{Q(d+\Delta d)}{\epsilon_0S}$

$\frac{Q(d+\Delta d)}{\epsilon_0 S}-\frac{Qd}{\epsilon_0S}=100$

$\frac{Q\Delta d}{\epsilon_0 S}=100$

$\epsilon_0=8.85\times 10^{-12}$

$Q=\frac{100\times 8.85\times 10^{-12}\times 0.036}{0.008}$

$Q=3.9825\times 10^{-9} C$

Hence, the charge on positive plate of capacitor= $Q=3.9825\times 10^{-9} C$

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4 years ago

If there is a negative sign in front of the Hooke's Law equation, what does the force, F, represent?

SashulF [63]

Answer:

Hooke's law, given by $F=-kx$ is denoted with a negative sign to regard that the direction of restoring force that occurs opposite in direction of the force that caused the displacement $x$ . F represents the force required to create a spring displacement of $x$ .

Explanation:

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2 years ago

16g 2g/cm3 what is the Volume

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Answer:

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3 years ago

A small metal bead, labeled A, has a charge of 28 nC .It is touched to metal bead B, initially neutral, so that the two beads sh

Dmitry_Shevchenko [17]

Answer:

Explanation:

Let the charge on bead A be q nC and the charge on bead B be 28nC - qnC

Force F between them

4.8\times10^{-4} = $\frac{9\times10^9\times q\times(28-q)\times10^{-18}}{(5\times10^{-2})^2}$

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133.33 = 28q - q²

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3 years ago