A1000 kg car moves as speed from 10 m/s to 30 m/s in 20 seconds. what is the average speed ? what is the acceleration ? what is the average force acting upon it ? if the car turns along a circle at speed 5 m/s around a curve 30 meters in radius , how big the centripetal force is needed ?

Why don't you see your reflection in water with waves or repples

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

Una carga puntual de 3 x 10-6 c se coloca a 12 cm de una segunda carga puntual de - 1,5 x 10-6 c. calcular la magnitud fuerza eléctrica entre las cargas