Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
The velocity of sound in air at 15°C is 35400ms\(^{-1}\). Calculate the velocity at 47\(^o\)C
790ms\(^{-1}\)
602ms\(^{-1}\)
358ms\(^{-1}\)
322ms\(^{-1}\)
Correct answer is C
No explanation has been provided for this answer.
capacitance would increase
capacitance would decrease
charge on the capacitor would increase
charge on the capacitor would decrease
Correct answer is A
No explanation has been provided for this answer.
Deflected, deflected, deflected
Deflected, deflected, not deflected
Deflected, not deflected, deflected
Not deflected, deflected, deflected
Correct answer is B
No explanation has been provided for this answer.
0.25\(\Omega\)
2.50\(\Omega\)
25.00\(\Omega\)
250.00\(\Omega\)
Correct answer is C
No explanation has been provided for this answer.
48.0°C
38.0°C
28.3°C
23.0°C
Correct answer is C
GIVEN DATA:
where ΔL is the increase in length = 0.01
L1 is the initial length = 100
T1 = 20
T2 = ?
α is the linear expansivity of iron = 1.2 x 10\(^{-5}\)°C
Formula
ΔL = L1αΔT
ΔT = \(\frac{ΔL}{L1α}\)
ΔT is the change in temperature = T2 - T1
T2 = \(\frac{ΔL}{L1α}\) + T1
T2 = \(\frac{0.01}{100 \times 1.2 x 10^{-5}}\) + 20
T2 = 8.3 + 20
T2 = 28.3