The fossil record shows that modern horses are taller and have their heads in a more elevated position than their ancestors did millions of years ago. one explanation for this could be that the horse’s diet changed gradually over time and that being taller and better able to see, bettered their chances to find food and survive. true/false

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s