SPEED, DISTANCE & TIME 1. A car takes 6mins to travel 5miles. What is the speed in mph? (mins/60secs. = hr) 2. .An MRT train started from rest and moved with uniform acceleration, it acquired a speed of 30m/s after 120s. Find its acceleration. 3. What is the average velocity of a car travels 30km due to west in 0.50hr? (in m/s) 4. A 1000kg airplane is flying perfectly level flight. The drag is 25000N and the thrust is 40000N. Find its acceleration. NEWTON'S LAW OF MOTION 5. If a ball is thrown at 150m/s- and its mass is 0.50kg. What force is necessary to change the direction of the ball? 6. A net force of 4.2x10#N acts on a 3.2x10*kg airplane during takeoff. What is the force on the plane's 75kg pilot? 7. Mike's car, which weighs 1000 kg, is out of gas. Mike is trying to push the car to a gas station, and he makes the car go 0.05 m/s^2. Using Newton's Second Law, you can compute how much force Mike is applying to the car. UNIVERSAL LAW OF GRAVITATION 8. Estimate the magnitude of the mutual gravitational force between the Earth's mass (6.0x1024kg) and the Moon's mass (7.4x1022kg). 9. Find the mass of object if the magnitude of the gravitational force acting on each particle is 2x10-N the mass of the object is 2.5kg and the object 1.2m apart. 10. Determine the force of gravitational attraction between Sun's mass and the Earth's mass