Zosia położyła swój plecak na podłodze jadącego autobusu. Autobus nagle zaczął hamować. Obliczmaksymalne przyspieszenie, z jakim może hamować autobus, aby plecak nie przesunął się popowierzchni podłogi. Plecak ma masę 3 kg i zacząłby się poruszać, gdyby siła bezwładnościprzekroczyła wartość 9 N.

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?

What efficiency of a car's engine when heat input is 200,000 joules and waste heat is 150,000 joules? a. 75% b. 35% c. 25% d. 85%