PHYSICS HIGH SCHOOL

Calculate the conductance of a conduit the cross-sectional area of which is 3.0 cm2 and the length of which is 9.0 cm, given that its conductivity is 0.80 ohm-1cm-1.

Answers

Answer 1

Answer:

Answer: $0.266 ohm^(-1)$

Explanation: Specific conductance or conductivity is the conductance for unit volume of a solution.

$\kappa=C* (l)/(a)$

where,

$\kappa$ =Specific conductance or Conductivity= $0.80ohm^(-1)cm^(-1)$

C = Conductance = ?

l = length= 9.0 cm

a = area = 3.0 $cm^2$

$(length)/(area)$ = cell constant = $(9.0cm)/(3.0cm^2)=3cm^(-1)$

$0.80ohm^(-1)cm^(-1)=C* 3cm^(-1)$

$C=0.266 ohm^(-1)$

Answer 2

Answer: for resistance we have R=ρ l/a
thus for conductance we have K=σ a/l
conductance,K=1/R
conductivity,σ =1/ρ

σ = .80 Ω-1 cm-1
l =9 cm
a = 3 cm²
K=.80 ×3/9
=0.26 Ω-1

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Answers

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A bowling ball has a mass of 7.2 kg and a weight of 70.6 N. It moves down the bowling alley at 1 m/s and strikes a pin with a force of 15.0 N. What is the force that the pin exerts on the bowling ball?

Answers

The answer is: 15.0 N

Answer:

15N

Explanation:

The choices for this question are

7.2 N
15.0 N
70.6 N
85.6 N

Givens

$m=7.2kg$

$W=70.6N$

$v=1 m/s$

$F=15N$

However, to solve this we just need to use Newton's third law which states: "When an object exerts a force on another object, the second object will exert an equal and opposite force to the first object".

If the bowling ball strikes a pin with a force of 15N, then the pin will exert the same 15N on the bowling ball, but with the opposite direction. If the bowling force is positive, then the pin force will be negative.

Therefore, the right answer is the second choice 15N.

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C. variable.
D. observation.

Answers

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Answers

Answer:

Explanation:

Given

Dolphin leaps out an angle $\theta =36.6^(\circ)$

Horizontal component of dolphin velocity $u_x=7.87\ m/s$

Suppose u is the launch velocity of dolphin

therefore $u\cos \theta =u_x---1$

and vertical velocity $u_y=u\sin \theta ----2$

divide 1 and 2 we get

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$u_y=7.87\cdot \tan (36.6)$

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B. Alternating current flows in only one direction. Direct current regularly reverses direction.

C. Direct current requires insulators, but alternating current does not.

D. Alternating current requires insulators, but direct current does not.

Answers

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Answers

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Explanation:

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