Other Physics Answers

1. A charged parallel plate with 15F connected to a battery with 9V. When a dielectric material was inserted between the parallel plates. What happens to the stored charges in the capacitor? 2. Find the capacitance of a layer of Al203 that is 0.5 m thick and 2000 mm2 of square area ( r= 8.854 x 10-12FM-1).

A constant net force of 350 N is applied to accelerate a cart in a frictionless surface from rest to a velocity of 65 m/s in 20 s. What is the mass of the cart?

A 60kg survivor of a shipwreck sits on a block of wood having volume of 1.6m³. Two birds of the block of the wood is under seawater (density = 1025 kg/m³ .find a the volume of diaplaced seawater by the block of wood, b. buoyant force on the block of wood and the survivor

a bicycle wheel turns with constant angular accceleration of 0.64 rad/s²:

a) how much time does it take to reach an angular velocity of 8 rad/sec starting from rest?

b) how many revolutions does the wheel turn in this time interval?

1/. A signal is transmitted from a ship and an echo is received from an object below the ship 4 s later. Calculate the distance of the object from the ship if the speed of sound in water is 1400 m/s.

The waves on a string have wave speed 8.00m/s, amplitude 0.0600m, and wavelength 0.400m. The waves travel in the -x direction and at t = 0s, the end of the string has its maximum upward displacement.

(a) Write a wave function describing the wave and

(b). Find the transverse displacement of a particle at x = 0.350m at time t = 0.150s

A sikorsky freight helicopter can easily lift a 5000 kg truck. If the acceleration of the truck is 1.5 m/s2 up, what is the net force being applied by the helicopter?

A car changes its velocity from 20 m/s [N] to 20 m/s[S] in 5.5 s. If the mass of the car is 1500 kg, 

what is the net force acting on it?

The electric filed due in a static electric charge is 3 000 N/C and passes through a surface area of 0.3 m2. Calculate the electric flux

1. A Cylindrical capacitor having a length of 8 cm is made of two concentric rings with an inner radius as 3 cm and outer radius as 6 cm. Find the capacitance of the capacitor.

2. A parallel-plate capacitor is filled with polystyrene of 0.0002 m thickness. Find the plate area if the new capacitance after the insertion is 3.4 µF.