You are given a metal sample of weight 28.4 and asked to determine its specific heat. you add 1.25 x 104 j of heat to the sample and then measure a temperature increase of 18.0°c. what is the specific heat of the sample?

1400 kg car has a speed of 27 m/s. if it takes 7 s to stop the car, what is the impulse and the average force acting on the car?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Avehicle accelerates from 0 to 30 m/s in 10 seconds on a straight road