Other Physics Answers

A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds.If acceleration due to gravity is 10m/second-2.The power expended is???

A ball of mass 8kg falls from a height of 100m . Neglecting air resistance, calculate its total energy after falling a distance of 40m

1. A uniform electric field E = 6500 N/C passing through a flat square area

A = 10m2

. What is the electric flux?

A potential difference of 250V is applied to a field winding at 15°C and the current is 5A. What will the temperature of the winding when current has fallen to 3.91A, applied voltage being constant. Assume delta15=0.00393/°C

A platinum coil has a resistance of 3.146ohms at 40°C and 3.767 ohms at 100°C. Find the resistance at 0°C and the temperature coefficient of resistance at 40°C

Two capacitors with 2.0 F and 3.0 F capacitance, respectively, are connected in series and subjected to a total potential difference of 100 V.

Find the

(a) total capacitance,

(b) charge stored in each capacitor, and

(c) potential difference across each capacitor.

A wheel rotates with a constant angular acceleration of 3.5 rad/s². If the angular speed of the wheel is 2 rad/s at t = 0, Find what angle does the wheel rotate between t = 0 and t = 2 s ?

A cyclist cycles down a hill. At the top of the hill of height 50m he reaches a speed of 50ms-1. Calculate his speed at the bottom of the hill.

Given that the Young modulus of steel is 210 GPa, the extension of a steel wire undergoing a stress of 300x10⁶ Pa is equal to:

A) 0.14%

B) 1.4%

C) 14%

D) 140%

The speed of a ball bearing falling through treacle:

A) Decreases with distance fallen.

B) Increases with distance fallen and reaches a maximum.

C) Is constant.

D) Reaches a maximum and then decreases.