How many uranium atoms are there in 8.6 g of pure uranium? The mass of one uranium
atom is 4 × 10−26 kg.

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

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

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