Physics Answers

 A star is 5.00 ly from the Earth. At what speed must a spacecraft travel on its journey to the star such that the Earth–star distance measured in the frame of the spacecraft is 2.00 ly

A bangka (boat) starts from rest. After 10 seconds, the bangka has a speed of 40 km/h.

(a) Compute the bangka’s final velocity in units of m/s.

(b) Compute the bangka’s average acceleration.

THE SUBSTATION BUSBAR IS MADE UP OF 2 INCHES ROUND COPPER BARS 240in LONG.

WHAT IS THE RESISTANCE OF EACH BAR IF RESISTIVITY IS 1.724 x 10-6 OHM-CM?

A ball is dropped from the top of a 5.00-m high building. If air resistance is neglected, what is its velocity after 0.70 s?

Neglecting air resistance, how long shall it take an object in free fall to have a velocity of 5.0 m/s?

At what velocity shall a dropped object fall a distance of 1.75 m? Neglect air resistance.

A 10-kg metal ball is dropped from the top of a building 5.0 - m high. How long will it take this object to hit the ground? Neglect air resistance.

Neglecting air resistance, how long shall it take an object in free fall to have a velocity of 5.0 m/s?

For a series LRC circuit, if L=30H, R= 0.05 ohms and C= 5.8F, what is the time required for the amplitude of the charge stored by the capacitor to be halved?

What will be the time required to half the amplitude of charge stored by a capacitor and time for the energy stored to be halved in a series LRC circuit with L=40H, R=0.03 ohms and C=4.8F?