A car of mass 2000 kg is moving with a velocity of 20 m/s and is acted upon by a forward force of 2000 N due to engine and delaying force of 1000 N due to friction. Find its velocity after 20 seconds.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

What are the similarities & differences between a thermistor and a light dependent resistor in physics?