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3 years ago

Answer these questions plz

Physics

1 answer:

lozanna [386]3 years ago

8 0

1. The property of a conductor by virtue of which it posses the flow of electric current through it is called resistance.

2. The resistance of a conductor depends on the cross sectional area of the conductor and it's resistivity.

3.This id due to the fact that the resistance of a wire is inversely proportional to the square of its diameter.

4.Due to at high temperatures , the alloy donot oxidize. Alloy doesn't melt readily and get deformed.

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9. True or False: Sawmills and gristmills are machines that do not need

gizmo_the_mogwai [7]

Answer:

true can i get brainliest :)

Explanation:

4 0

3 years ago

When developing a question for a scientific inquiry, the question will ideally

Lisa [10]

When developing a question for a scientific inquiry, the question will ideally :

- be measurable
- Will have various variables that could be used for further testing
- not just simply ask why

hope this helps

7 0

3 years ago

Read 2 more answers

13. A step up transformer has 250 turns on its primary and 500 turns on it secondary. When the primary is connected to a 200 V a

Lisa [10]

Answer:

The output power is 2 kW

Explanation:

It is given that,

Number of turns in primary coil, $N_p=250$

Number of turns in secondary coil, $N_s=500$

Voltage of primary coil, $V_p=200\ V$

Current drawn from secondary coil, $I_s=5\ A$

We need to find the power output. It is equal to the product of voltage and current. Firstly, we will find the voltage of secondary coil as :

$\dfrac{N_p}{N_s}=\dfrac{V_p}{V_s}$

$\dfrac{250}{500}=\dfrac{200}{V_s}$

$V_s=400\ V$

So, the power output is :

$P_s=V_s\times I_s$

$P_s=400\ V\times 5\ A$

$P_s=2000\ watts$

$P_s=2\ kW$

So, the output power is 2 kW. Hence, this is the required solution.

8 0

3 years ago

A boat, the speed of which is 10 m.s-1 relative to the water, sails downstream at an angle of 60 degrees, with the flow of the r

Tems11 [23]

Answer:

resultant velocity of boat will be 11.2249 m/sec

Explanation:

We have given speed of boat $v_b$ = 10 m /sec

Velocity pf current flow $v_c$ = 4 m /sec

Angle at which boat is moving = 60°

We have to find the resultant velocity

We know that resultant velocity is given by $v_r=\sqrt{v_b^2+v_c^2+2v_bv_rcos\Theta}=\sqrt{10^2+4^2+2\times 10\times 4cos60^{\circ}}=11.2249m/sec$

So resultant velocity of boat will be 11.2249 m/sec

4 0

3 years ago

5–111. A box having a weight of 8 lb is moving around in a circle of radius rA = 2 ft with a speed of (vA)1 = 5 ft>s while co

Elis [28]

Answer:

a) vB = 10.77 ft/s

b) W = 11.30 lb*ft

Explanation:

a) W = 8 lb ⇒ m = W/g = 8 lb/32.2 ft/s² = 0.2484 slug

vA lin = 5 ft/s

rA = 2 ft

v rad = 4 ft/s

vB = ?

rB = 1 ft

W = ?

We can apply The law of conservation of angular momentum

Lin = Lfin

m*vA*rA = m*vB*rB ⇒ vB = vA*rA / rB

⇒ vB = (5 ft/s)*(2 ft) / (1 ft) = 10 ft/s (tangential speed)

then we get

vB = √(vB tang² + vB rad²) ⇒ vB = √((10 ft/s)² + (4 ft/s)²)

⇒ vB = 10.77 ft/s

b) W = ΔK = KB - KA = 0.5*m*vB² - 0.5*m*vA²

⇒ W = 0.5*m*(vB² - vA²) = 0.5*0.2484 slug*((10.77 ft/s)²-(5 ft/s)²)

⇒ W = 11.30 lb*ft

6 0

3 years ago

Answer these questions plz​

Answer these questions plz