Question

As shown below, a block of mass m = 4 kg is sitting on the frictionless floor of a train car. and it is connected to the right wall of the train car by a string. The train is moving in a straight line to the right, and it is accelerating at a constant rate a = 5 m/s^2. At the particular moment when the speed of the train is v = 15 m/s, what is the tension in the string? a) 0 N b) 20 N c) 40 N d) 60 N A moon with a mass of 4.8 times 10^22 kg orbits a planet in a circular orbit with a radius of 6.2 times 10^8 m. If it takes 45 days for the moon to make one complete orbit around the planet, what is the mass of the planet? a) 3.7 times 10^24 kg b) 5.1 times 10^24 kg c) 7.9 times 10^24 kg d) 9.3 times 10^24 kg

Answer 1

Solution: ension Given that r 6.2x108 m T -45Days - 3.89x10° sec We know that T2 47 r'ĢM 47, x (6.2x10*) 3.89× 106), 6.67×10-11 M- M - 9.3x10 Kg