Physics Answers

A simple pendulum has a period of 2 seconds and is operated in a lift on Earth.what will happen to it's period;

When the lift ascending at uniform velocity

if the velocity of a particle is defined by v = (2t + 1)i +3j fps, and is position vector at t = 1 sec is t = 4i+ 3j ft, determine the path of the particle in terms of its x and y coordinates.

Give a reason why it is much more useful to plot a graph of acceleration against the inverse of mass, than it is to plot a graph of acceleration against mass.

The magnetic flux density between the poles of a powerful electromagnetic force is 2.0 Tesla. A wire of length 2.0x10-²m. carrying a current of 4 ampere is placed in the given field. Calculate -

I. The maximum force on the wire.

II. Force when the wire meet at an angle of 45°

III. Force when the wire is parallel to the field.

the force on a charge moving with velocity (v) in a magnetic field (B) half of a maximum force.

Calculate the angle between V and B. F=qvB

A current of 2.0 A is measured when a battery is connected across a resistor, R1 = 10Ω. When the same battery is connected across another resistor, R2 = 6.0Ω resistor, the current changes to 3.0 A. 

(a)          Calculate the potential differences across each of resistors.

(3 marks)

(b)          Find the emf and the internal resistance of the battery.

(9 marks)

(c) Determine the power dissipated in each resistor.

(3 marks) 

A 50g arrow moving at 20m/s strikes a pumpkin and drills a 35cm hole straight through it. When it emerges, the arrow has a speed of 8m/s. Assume uniform deceleration, find the time taken by the arrow to pass through the pumpkin.

Suppose there is an isolated charge A B

(+1.5𝑥10−19𝐶) that is displaced from point

A to B due to the electric force. As the

charge moves, it produces an electric field

which has a magnitude of 6.9 N/C. Find

the work done by the electric force of the

charge if it moves 1.5 m from its original

position.

If the 0.100-mm-diameter tungsten filament in a light bulb is to have a resistance of 0.300 \OmegaΩ at 20.0 ^o

o

C , how long should it be?

(1) A student claims that capacitors in parallel combinations have greater

equivalent capacitance compared to the magnitude of either the capacitor and

less than either the capacitors when connected in series combination. How will

you agree or disagree with the claim?