Physics Answers

The intensity of sound heard by Jonathan when his headphones is “on” his ear is around \ (3.6x10^-4 W/m² \). Assuming the initial distance is around 4.6cmwhen the headphone is on his ear, what is the intensity when he removes the headset, and is a distance 7.4cm from his ear?

Note: Use this notation in writing units with exponents that are more than one: s² = s2

A 25kg child sits in a swing that is attached to ropes 1.6 m long. Find the potential energy of the child relative to his lowest position when the ropes are horizontal.

A rubber band has a spring constant of 45N\m. If the rubber band is pulled by a force of 9.8N, (a) how far would it stretch?(b)what is the worked done by this force in stretching this string

A horizontal force F applied to an object varies with its displacement. (Force is 4.0) Calculate the work done by the force when the object moves from x =0 to x=10.0m.

A shopper pushes her 25 kg grocery cart by a force of 225 N inclined at an angle of 60° with the horizontal through a distance of 7.5 m . Find the worked done by (a) the 255 N force and (b) friction. Assume that the coefficient of kinetic friction is 0.32

there are 500m3 of air in a shop at 20°c. what is the difference in volume if the temperature is 0°c

A christmas ball in a shape of a hollow sphere is hung from the tree by a piece of trade attached to the surface of the ball the mass and radius of the tall are 0.105 kg and 0.12 m respectively what will be its period of rotation when slightly displaced from its equilibrium position

An electron experiences a force f given as (f=3.2i ---2.7j)×10^-13N when passing through a magnetic field B=0.72kJ. calculate the velocity of the electron?. Take the electron charge Q=1.5×10^-19cou.

Derived the equation for velocity and acceleration given that position x = v⁰t + ½ at², where v⁰ and a are the initial velocity and constant acceleration, respectively. Find the position, velocity, and acceleration of the object at t=4.0s. Assume that v⁰= 4m/s and a=5m/s².

A carnot engine absorbed 1,0kj of heat at 300k and exhausted 400j of heat at the end of the cycle. What is the temperature at the end of the cycle?