Physics Answers

A 200 m long aluminum wire has the same resistance and cross-section area as a carbon wire. What is the length of the carbon wire?

A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?

An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.

An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.

A steadu current of 2.0 A flows in a wire for 16.0s (a) How many coulombsof a charge flow

through the wire? (b) How many electrons flow through the wire for the given time interval?

If the current (I) in a long solenoid is doubled and number of turns per unit length (n) are halved, find the effect on the magnetic field (i) inside and (ii) outside the solenoid.

In a current carrying solenoid, determine the 𝑑𝐵/𝑑𝑥 value at the (i) both ends and (ii) centre of the solenoid.

Explain two key differences between De Sauty’s Bridge and Carey Foster’s Bridge.

Find the (i) resonant and (ii) anti-resonant frequencies for series and parallel LCR circuits, respectively with the following data: L=10 mH, C=10 μF and R=1 kΩ. 

On a different day at local midnight, Orion the Hunter was found to have just crossed the

local meridian too. Which constellation is the Sun approximately found in? Hint: at local

midnight, the hour angle of the sun is defined to be 12h if we were to set 0h to be at noon.