Suppose an intelligent society capable of receiving and transmitting radio signals lives on a planet orbiting zagnut, a star 116 light-years away from earth. if a signal were sent toward zagnut in 1999, what is the earliest year that earth could expect to receive a return message? (hint: a light-year is the distance a ray of light travels in one year.)

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600