I need help with my physics. It’s on waves :(

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

If the textbook weighs 19.6 newtons on venus, what is the strength of gravity on venus?