a car with a mass of 1200kg is moving around a curve with a radius of 40 Chapter

Question

a car with a mass of 1200kg is moving around a curve with a radius of 40 Chapter 5 Circular motion, the planets and gravity .A ball is traveling at a constant speed of 5 m/s in a circle with a radius of 0.8 m What is the centripetal acceleration of the ball? What's its direction 2 A car with a mass of 1200 kg is moving around a curve with a radius of 40 m at a constant speed of 20 m/s a) What is the centripetal acceleration of the car? b) What is the magnitude of the force required to produce this centripetal acceleration? Two 100-kg persons are separated by a distance of 1 m. using Newton's law of gravitation, find the magnitude of the attractive gravitational force exerted by one person to the other 4 Two masses are attracted by a gravitational force of 0.36 N. What will the force of attraction be if the distance between the two masses is tripled? s Does an astronaut have the same weight irn different planets? Explain why

Explanation / Answer

1) centreiptal acceleration, a = v^2/r

= 5^2/0.8

= 31.3 m/s^2

2)

a) a = v^2/r

= 20^2/40

= 10 m/s^2

b) F = m*a

= 1200*10

= 12000 N

3) F = G*m^2/r^2

= 6.67*10^-11*100^2/1^2

= 6.67*10^-7 N

4) If distance is trippled

Force becomes 1/9 times

so, F' = F/9

= 0.36/9

= 0.04 N

5) No.

weight = m*g

g is not constant on every planet. so, weight of austronaut changes from planet to planet.

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