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slega [8]
3 years ago
13

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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Hoped I Helped!</span>
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3 years ago
Which quantity has both a magnitude and a
alexira [117]
(2) impulse is a vector quantity. Energy has no direction, nor does power. Work is a dot product of vector quantities, which makes it a scalar.
8 0
3 years ago
Read 2 more answers
Which statement is TRUE? Group of answer choices a) An object that is slowing down while traveling in the negative x-direction a
slava [35]

Answer:

d) An object that is speeding up always has a positive acceleration, regardless of the direction it travels.

Explanation:

a ) a) An object that is slowing down while traveling in the negative x-direction always has a positive acceleration.

It has negative acceleration in  the negative x-direction.

b) An object that is speeding up while traveling in the negative x-direction always has a positive acceleration.

It has a positive acceleration in the negative x-direction'

c) An object that is slowing down always has a negative acceleration, regardless of the direction it travels.

It has a positive  acceleration in opposite direction.

e ) An object that is slowing down always has a positive acceleration, regardless of the direction it travels.

It has a positive acceleration only in opposite direction .

6 0
3 years ago
Steam enters an adiabatic turbine at 5 MPa and 4500C and leaves at a pressure of 1.4 MPa. Determine the work output of the turbi
REY [17]

Answer:350.92 KJ/kg

Explanation:

Given the process is reversible adiabatic i.e it is isentropic

P_1=5 MPa

T_1=4500 MPa

P_2=1.4 MPa

From steam table

h_1=3317.03KJ/kg

For isentropic process s_1=s_2

at P_2=1.4 MPa

s_2=6.82 KJ/kg-k

h_2=2966.11 KJ/kg

Therefore Work output of the turbine per unit mass of steam is =h_1-h_2

=3317.03-2966.11

=350.92 KJ/kg

8 0
3 years ago
A 2.00-kg object on a frictionless horizontal track is attached to the end of a horizontal spring whose force constant is 5.00 N
Gnesinka [82]

Answer:

Force = 10.244 Newtons

b) No of oscillations = 0.88

Explanation:

Since the block executes SHM we can write it's position as function of time as

x=Asin(\omega t)

ω is the natural frequency of the system

A is the amplitude of the system

\omega =\sqrt{\frac{k}{m}}

Thus accleration of the block

x=Asin(\omega t)\\\\a=\frac{d^{2}x(t)}{dt^{2}}\\\\a=\frac{d^{2}Asin(\omega t)}{dt^{2}}\\\\a=-A\omega ^{2}sin(\omega t)

Thus using the given values at t= 3.50 sec we can calculate the acceleration as

k=\sqrt{\frac{5}{2}}=1.58rad/sec\\\\A=3.0m\\\\a=-3.0\times (1.58)^{2}sin(1.58\times 3.5)\\\\a=5.122m/s^{2}

thus force can be calculated using newtons second law as

Force = m\times accleration\\\\force=2\times 5.122=10.244 Newtons

b)

Now no of oscillations can be obtained as

\frac{time}{TimePeriod}\\\\Time Period=\frac{2\pi }{w} \\\\time Period=\frac{2\pi }{1.58}\\\\ TimePeriod=3.976secs\\\\

no of oscillations in 3.50 seconds = 3.50/3.976 = 0.88

5 0
3 years ago
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